Nanoengineering is an essential bridge that utilizes nanoscience and nanotechnology to enable a broad spectrum of totally new materials, functionalities, applications, devices, and products. Conventional photonic manufacturing technologies have extended well into the nanometer regime. Over-extended technologies are pushing sizes and densities into ranges that challenge reliability and basic physics. Nanoengineering also allows for manipulating matter at the nanoscale. Newly engineered materials, processes, ultrahigh precision and metrologies are emerging. Novel synthesized nanomaterials, based on 1D, 2D, and 3D architectures, nanocomposites and hierarchical assemblies based on such materials offer exciting opportunities. Nanostructured thin films display unique phenomena, thus enabling the improvement of traditional applications or the development of novel applications. Newly attainable design and fabrication of miniature optical elements have enabled the development of micro/nano/quantum-scale optical, near field optics, and optoelectronic elements in ever more diverse application areas. New low power logic and memory devices, expanded functionality, systems on a chip, solar cells, energy storage devices, biotechnology, photonics, photovoltaics, molecular electronics and optics are emerging. Application areas are highly diversified and include telecommunications, data communications, consumer electronics, microwave photonics, optical computing, neural networks, optical storage, non-volatile data storage, information display, optical imaging, printing, optical sensing, optical scanning, renewable energy harvest and storage, medical diagnosis, chemical/biological/environmental sensing, new nanomechanic applications, and new medical devices and prosthetic methods.

Critical to this realization of robust nanomanufacturing is the development of appropriate instrumentation, metrology, and standards. As novel applications emerge, the demand for highly sensitive and efficient measurement tools with the capability of rapid, automated, and thorough coverage of large functional areas at high precision is emerging.

The newly upcoming nanotechnologies present new opportunities and challenges in materials processing, device design, and integration. Drivers for commercial deployment include increased functionality, small form factor, performance, reliability, cost, as well as renewable energy and climate change mitigation.

Papers are solicited in the areas of:

Light-matter interactions in 1D and 2D nanomaterials
Photon upconversion
Nanostructured thin films
Innovative patterning, materials engineering, nanofabrication, and nanolithography for photonics applications
High precision nanopositioning and feedback, new metrologies for photonics
Nanomanufacturing of 1D and 2D nanomaterials for photonics applications
Devices and properties of nanostructures for photonics (experiment and/or theory)
Nano- and micro-optics
Energy harvesting and storage nanotechnologies
Commercialization of nano- and micro-structure photonic and other devices, modules, and systems
In progress – view active session
Conference 12202

Nanoengineering: Fabrication, Properties, Optics, Thin Films, and Devices XIX

21 - 23 August 2022 | Conv. Ctr. Room 1A
View Session ∨
  • 1: Nanostructured Thin Films I
  • 2: Nanostructured Thin Films II
  • 3: Nanophotonic Structures and Devices
  • 4: Light-Matter Interaction
  • Sunday Evening Plenary
  • Nanoscience + Engineering Plenary
  • Poster Session

Timing will be finalized in early August


Call for Papers Flyer
Session 1: Nanostructured Thin Films I
21 August 2022 • 8:30 AM - 10:30 AM PDT | Conv. Ctr. Room 1A
21 August 2022 • 8:30 AM - 8:50 AM PDT | Conv. Ctr. Room 1A
21 August 2022 • 8:50 AM - 9:10 AM PDT | Conv. Ctr. Room 1A
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A modification to the traditional layer by layer process is introduced. In this process, the substrate is irradiated with laser light during the polycation and/or polyanion dipping cycles. The interaction between laser light, polymer solution, and thin film results in a patterned layer by layer structure. PAH/PCBS polymer thin films were fabricated using the laser modified approach with varied bilayer numbers, laser powers, and laser irradiation times. By adjusting irradiation time, irradiation power, number of bilayers, and the location of irradiation, a variety of structures with controlled thicknesses can be fabricated.
21 August 2022 • 9:10 AM - 9:30 AM PDT | Conv. Ctr. Room 1A
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This talk describes the fundamentals underlying defect-free growth of large-area III-V devices on oxide-nanopatterned GaAs substrates, and applies them to the growth of 24.8% efficient GaAs solar cells with a dislocation density less than 5 x 10^5 cm^-2. In this application the nanopatterned oxide layer serves as a mechanically weak layer for substrate separation and reuse, but in other applications it could serve as an optical element to diffract or redirect light. This presentation focuses on how the topology and dimensions of the oxide mask must be controlled to avoid defect formation wherever the epilayer coalesces over a mask feature.
21 August 2022 • 9:30 AM - 9:50 AM PDT | Conv. Ctr. Room 1A
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In this proposal, we discuss a thin film fabrication process designed for solar sailing. Solar sailing is an emerging in-space propulsion method that enables space exploration to be time efficient and low cost. However, to realize fast-transit in solar sailing, lightweight and solar reflective thin film materials are needed. Here we present a fabrication process that enables specular reflective metal coating on top of a freestanding, ultrathin carbon nanotube thin film. The process is scalable, enabling large area fabrication. We demonstrate a centimeter scale freestanding sample. The optical and thermal characteristics of the sample are measured.
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Oxygen mediated changes in morphological, optical, and electrical properties of RF sputtered Ga2O3 thin film were investigated in this work. All the Ga2O3 thin film was deposited on p-Si substrates with varying oxygen flow rates (OFR). The effect of OFR on the Ga2O3 thin film morphology has been investigated by FEGSEM. While the optical and luminescence properties were studied by UV-VIS and photoluminescence (PL) spectroscopy. The diffuse reflectance spectra reveal the change in optical bandgap with varying OFR. Whereas, the PL spectra show the change in different types of oxygen vacancy defects originated due to OFR induced structural asymmetry in the Ga2O3 thin film. The change in dark current in Ga2O3/p-Si heterojunction for different OFR was studied in detail for future DUV detectors application.
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We report a reduction in oxygen vacancy related defects after phosphorus dopant incorporation in the ZnO film. The Room-temperature photoluminescence spectra reveal a shift towards UV region in doped and annealed samples. A relatively huge reduction in oxygen vacancies are observed in phosphorus doped ZnO films as compared with undoped and undoped-anneal films. This is verified from the integrated area of oxygen vacancy related peak (~531-532 eV) in O-1s XPS spectra. Such type of oxygen vacancy reduction in ZnO films by cost-effective SOD doping technique is highly essential for developing the several ZnO based functional devices.
Session 2: Nanostructured Thin Films II
21 August 2022 • 11:00 AM - 12:40 PM PDT | Conv. Ctr. Room 1A
21 August 2022 • 11:00 AM - 11:20 AM PDT | Conv. Ctr. Room 1A
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Bragg mirrors play an essential role in various optical and photonic devices. The fabrication of Bragg mirrors is mainly done by physical and chemical vapor deposition, which are costly and do not allow for lateral patterning. Here, we demonstrate a versatile and straightforward method to realize the fabrication of Bragg mirrors by fully inkjet printing using a commercial desktop printer. The reflectance peaks of the Bragg mirrors reach 99% with ten uniform bilayers. The central wavelength of the Bragg mirrors is tuned by adjusting printing parameters. With our method, laterally-patterned Bragg mirrors are successfully printed on large and flexible foils.
21 August 2022 • 11:20 AM - 11:40 AM PDT | Conv. Ctr. Room 1A
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Mono/few-layered MoS2 thin films were synthesized using pulsed laser deposition technique (PLD) on thermal oxide silicon (SiO2/Si) substrate. Thin films transistors are fabricated using mono/few-layered MoS2 thin films as channel layer in back gated configuration with SiO2 (100 nm) as the dielectric layer, thermally evaporated gold (Au) as the source and drain electrodes, and Si (n++) as the gate electrode. The device showed a p-type behavior with an on/off ratio of 10^3 which can be used for switching applications in optoelectronic devices.
21 August 2022 • 11:40 AM - 12:00 PM PDT | Conv. Ctr. Room 1A
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The development of silicon-organic hybrid (SOH) and plasmonic-organic hybrid (POH) electro-optic modulators in the 2010s has enabled the large electro-optic (EO) performance of organic chromophores to be leveraged for high-performance photonic components capable of integration with CMOS electronics. Recent improvements in theory-aided design and materials performance have enabled large increases in both electro-optic performance and materials stability. We report on the implications of these developments for hybrid device performance, manufacturability, processing, and packaging, as well as potential new directions for increasingly scalable fabrication of hybrid electro-optic devices for classical and quantum communications and computing applications.
21 August 2022 • 12:00 PM - 12:20 PM PDT | Conv. Ctr. Room 1A
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Optical elements are the main parts in laser system limiting the total generated output power due to optical resistivity. Improving the optical resistance of coatings is necessary for moving forward into this topic. All-silica mirrors were formed using glancing angle deposition method and conditioning effect was applied in order to increase resistance to laser radiation, reaching LIDT values up to 200 J/cm2 using 355 nm wavelength 2.05 ns pulsed laser.
21 August 2022 • 12:20 PM - 12:40 PM PDT | Conv. Ctr. Room 1A
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We propose the nanosecond laser processing of plasmonic metamaterials to produce large color gamuts in reflection and transmission observation modes and to control diffractive colors and polarization sensitive colors. During the laser process, silver nanoparticles experience plasmon-induced heating, growth and self-organization. Layers properties are also altered leading to different thicknesses, crystalline phases and periodic surface structures. The resulting colors that appears in the different modes of observation emerge from a combination of various optical phenomena such as the localized surface plasmon resonance of silver nanoparticles, interferences, diffraction and mode coupling whose few evidences are shown.
Session 3: Nanophotonic Structures and Devices
21 August 2022 • 2:10 PM - 4:10 PM PDT | Conv. Ctr. Room 1A
21 August 2022 • 2:10 PM - 2:30 PM PDT | Conv. Ctr. Room 1A
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Under certain conditions periodic arrays of metallic nanoantennas can support hybridization of localized surface plasmon resonances (LSPRs) with the lattice (photonic) modes, forming surface lattice resonances (SLRs). We study in-plane far-field scattering associated SLRs in cases wherein the lateral dimensions of the nanoantennas are much larger their heights. The impact of the multipolar nature of plasmonic edge modes in such nanoantennas on the formation SLRs and the spectral features of their field scattering are highlighted. Field scattering switching between SLRs and plasmonic edge modes is studied via control of the incident light polarization.
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Dielectric metasurfaces working at visible frequencies have been steadily investigated to realize practical flat optical components. However, recently investigated dielectrics, TiO2 and GaN suffer high fabrication costs since a precursor of TiO2 is expensive, and GaN requires two-step etching process. Here, this work suggests optical-loss-suppressed hydrogenated amorphous silicon (a-Si:H) for functional metasurfaces. Optical losses in the visible frequencies are manipulated by adjusting deposition conditions of plasma-enhanced chemical vapor deposition. Optical properties of a-Si:H are optimized for geometric metasurfaces, and it exhibits a high refractive index over 3.0 with low extinction coefficient (<0.1). Using them, highly efficient beam-steering metasurfaces, encapsulated metalenses, and bright structural coloration has been demonstrated. Considering that our manipulation efficiency approaches 42%, 65%, and 75% at the wavelength of 450, 532, 635 nm, it will be dominant materials for a functional photonic platform with low-fabrication costs.
21 August 2022 • 2:50 PM - 3:10 PM PDT | Conv. Ctr. Room 1A
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Single mode emission is one of the crucial requirements for Quantum Cascade Lasers (QCLs), which are compact laser sources of infrared radiation in the mid-IR range (3–20 micrometers) and in the THz range (1–5 THz). This feature is particularly important in all spectroscopic applications such as industrial process monitoring, remote sensing, breath analysis for medical diagnostic or industrial process monitoring. In this paper, we have proposed a modified approach to coupled cavity QCLs, based on multisection (three section) coupled cavity QCLs. The range of spectral tuning is very important from the point of view of applications in optical sensing techniques based on the intrapulse tuning of the laser emission. We have designed and fabricated 3-section CC QCLs characterized by intrapulse wavelength tuning of 2.8 cm-1, obtained for 2 mirosecond pulse width. The device operates above room temperature. The improvement of the spectral tuning of 3-section device is compared to 2-section laser. The third section improved significantly the performance of the laser in terms of single mode intrapulse wavelength tuning.
21 August 2022 • 3:10 PM - 3:30 PM PDT | Conv. Ctr. Room 1A
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Improving the heat dissipation in Quantum Cascade Lasers (QCLs) is important from the point of view of a growing number of their applications, which require better performance. In this paper, we propose and experimentally demonstrate the possibility of a significant reduction of Active Region (AR) temperature without sophisticated and fabrication-intensive means. We have examined the influence of electroplated gold thickness on thermal and electro-optical properties of InP-based QCLs. Numerical modeling, that we have performed, predicts a significant reduction of the laser core temperature of epi-side up mounted ridge waveguide QCLs with increased thickness of electroplated gold. Predictions of the numerical model have been confirmed experimentally by means of electro-optical, spectral, and thermal characterization.
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Inverse opal (IO) photonic semiconductors are promising materials for photocatalysis, thanks to their slow photon properties that increase light harvesting. Here, we report, in IO TiO2-BiVO4 photonic structures, the ability not only to generate slow photons in the visible range but also to tune their frequencies and transfer their energy. Angle-resolved photocatalytic experiments revealed a 70% increase in activity in all IO structures compared to non-IO compact films and a further 20% increase when the slow photons were accurately tuned to BiVO4 electronic absorption. The synthesis and tuning strategies presented here can be extended to all solar energy conversion applications.
21 August 2022 • 3:50 PM - 4:10 PM PDT | Conv. Ctr. Room 1A
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Quantum emitters are of great technological interest due to their capability of high quantum confinement of light. Among them, quantum dots (QDs) such as CdSe nanospheres exhibit great potential towards light emitting sources and biofluorescent tagging applications. In this work, we explore the compatibility of CdSe QDs with a polymer microcavity platform. We fabricate polymeric microdisks using replica molding technique with an indigenously developed stamping setup. This technique helps us produce cavity integrated micron scale light sources at a low cost with a facile fabrication scheme which does not require a clean room. TWe report he emission of quantum dots coupled to the Whispering Gallery Modes (WGMs) of the microcavity through micro-Photoluminescence (micro-PL) of the CdSe integrated polymer cavity.
Session 4: Light-Matter Interaction
21 August 2022 • 4:40 PM - 5:40 PM PDT | Conv. Ctr. Room 1A
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Biointegrated microlasers can act as highly localized sensors and report minute refractive index changes from within living cells. We previously reported non-obstructive and biointegrated whispering gallery mode nanolasers made from high-index semiconductor materials. Arsenide-free III/V alloys are attractive for this application due to minimal toxicity and high performance at visible wavelengths. Here, the band gaps of GaInP/AlGaInP quantum wells were engineered for absorption and emission at (far)-red wavelengths, allowing sub-pJ pumping at 642 nm and two-photon pumping with lasing thresholds around 80 pJ. This facilitates the wider integration of the nanolaser technology with popular fluorescence and multiphoton microscopy techniques.
21 August 2022 • 5:00 PM - 5:20 PM PDT | Conv. Ctr. Room 1A
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Band inversion in one-dimensional superlattices is a strategy to generate topological interface modes in electronics, optics, acoustics, and nanophononics. Despite their potential for the control of topologically robust interactions, most realizations of these states have so far explored only a single kind of excitation. In this work, we design and fabricate GaAs/AlAs devices with simultaneously inverted band structures for light and phonons. We experimentally observe colocalized interface modes for NIR photons by optical reflectivity and 18 GHz phonons by coherent phonon generation and detection. Through numerical simulations, we demonstrate the ensuing robustness of the Brillouin interaction between them with respect to a specific type of disorder. Potential future applications include the engineering of robust optomechanical resonators in a material system compatible with active media such as quantum wells and quantum dots.
21 August 2022 • 5:20 PM - 5:40 PM PDT | Conv. Ctr. Room 1A
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Thermal radiation is the most ubiquitous form of heat. Developing new science and technology to dynamically control radiative heat transfer can bring a profound impact on the mitigation of global warming, in which thermal engineering becomes increasingly important. In this talk, I will introduce our recent electrochemically-driven device that can vary the thermal emissivity between 0.07 and 0.92, which serves as a powerful radiative thermal switch to control the heat transfer. The device is water-based, flexible, and non-volatile, which can be used as scalable building envelope thermoregulation to reduce the energy consumption and carbon footprint of space heating and cooling.
Sunday Evening Plenary
21 August 2022 • 6:00 PM - 7:30 PM PDT | Conv. Ctr. Room 6A
Author(s): Michael W. Berns, Beckman Laser Institute and Medical Clinic (United States)
21 August 2022 • 6:05 PM - 6:35 PM PDT | Conv. Ctr. Room 6A
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It was 1966 and all I knew about lasers was that Goldfinger was going to slice James Bond in half. Then one of my professors at Cornell told me that the department had purchased a small ruby laser but did not know what to do with it and he felt it might be useful for very fine tissue ablation if coupled to a microscope. But the operating parameters of the red ruby laser made it difficult to control when focused to a small spot plus the absorption characteristics of most of the cell structures did not match the 694.3 nm wavelength of the laser. However, when the blue green argon ion laser was available, the ability to focus the pulsed beam to its diffraction limit plus the absorption properties of some cell structures (and the addition of light-absorbing dyes to these structures) allowed for precise ablation in spots less than 0.5 micrometer diameter, especially the chromosomes in live cells. When the nanosecond and picosecond 532nm and 355 nm harmonics of the NdYag lasers became available even greater precision of nanoablation was possible due to natural absorption by the target structure and/or non-linear multiphoton ablation which occurred regardless of absorption characteristics of the target. These optical systems were used (and still are) to perform subcellular surgery on any cell organelle visible with the light microscope. With Arthur Ashkin’s invention of optical traps (laser tweezers), cell biologists now had a complementary optical tool to the laser scissors and so began a renaissance in the use of light to finely alter and manipulate cells.
Quantum science and metrology (Plenary Presentation)
Author(s): Jun Ye, JILA, Univ. of Colorado (United States)
21 August 2022 • 6:45 PM - 7:15 PM PDT | Conv. Ctr. Room 6A
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Precise engineering of quantum states of matter and innovative laser technology are revolutionizing the performance of atomic clocks and metrology, providing new opportunities to explore emerging phenomena, test fundamental symmetry, and search for new physics. The recent work of measuring gravitational time dilation at the sub-millimeter scale highlights exciting prospects for new scientific discovery and technology development.
Nanoscience + Engineering Plenary
22 August 2022 • 8:30 AM - 10:05 AM PDT | Conv. Ctr. Room 6A
Session Chairs: Gennady B. Shvets, Cornell Univ. (United States), Cornelia Denz, Westfälische Wilhelms-Univ. Münster (Germany)
8:30 AM - 8:35 AM: Welcome and Opening Remarks
Author(s): Lisa V. Poulikakos, Univ. of California, San Diego (United States)
22 August 2022 • 8:35 AM - 9:10 AM PDT | Conv. Ctr. Room 6A
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The origin and progression of a variety of leading health challenges, encompassing Alzheimer’s disease, heart disease, fibrosis and cancer, are directly linked to changes in the presence and orientation of fibrous matter in biological tissue. Here, we leverage the unique properties of anisotropic, colorimetric metasurfaces to scale down the complex manipulation of light and selectively visualize disease-relevant fiber density and orientation in biological tissue. Starting with the example of breast cancer diagnostics, we then expand our view to the rich palette of fiber-affecting diseases where metasurfaces hold great potential as rapid, precise and low-cost tissue diagnostics with facile clinical implementation.
Author(s): Keren Bergman, Columbia Univ. (United States)
22 August 2022 • 9:20 AM - 9:55 AM PDT | Conv. Ctr. Room 6A
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High performance data centers are increasingly bottlenecked by the energy and communications costs of interconnection networks. Our recent work has shown how integrated silicon photonics with comb-driven dense wavelength-division multiplexing can scale to realize Pb/s chip escape bandwidths with sub-picojoule/bit energy consumption. We use this emerging interconnect technology to introduce the concept of embedded photonics for deeply disaggregated architectures. Beyond alleviating the bandwidth/energy bottlenecks, the new architectural approach enables flexible connectivity tailored for specific applications.
Poster Session
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
Conference attendees are invited to view a collection of posters within the topics of Nanoscience + Engineering, Organic Photonics + Electronics, and Optical Engineering + Applications. Enjoy light refreshments, ask questions, and network with colleagues in your field. Authors of poster papers will be present to answer questions concerning their papers. Attendees are required to wear their conference registration badges to the poster session.

Poster authors, visit Poster Presentation Guidelines for set-up instructions.
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We developed NO2 gas sensors composed of ZnO/TiO2 core–shell nanorods (NRs) decorated with Au nano- particles (NPs) synthesized via a simple low-temperature aqueous solution process, operated under ultraviolet irradiation to realize room temperature operation. The fabricated gas sensor with a 10 nm-thick TiO2 shell layer shows 9 times higher gas sensitivity and faster response and recovery times than ZnO NR- based gas sensors. This high performance can be ascribed to band bending between the ZnO and TiO2 core–shell layers and the localized surface plasmon resonance effect of Au NPs with a sufficient Debye length of the TiO2 shell layer.
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
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Metasurfaces have been innovative in manipulating the amplitude, phase, and polarization state of the incident light impinging upon the same. The incidence radiation can be absorbed, reflected or transmitted by the metamaterial depending upon the kind of metasurface it is composed of. Within the context, phase change mediums (PCMs), viz. VO2, GST, SrTiO3 etc., have been reported to be of great technological interest in devising photonic sensors for multiple sensing application – the concept which is centered on the crystallization of the medium or the thermal dependence of the same causing the change of state from the dielectric to metallic, or vice-versa. In the context of exotic electromagnetic behavior of metamaterials (or metasurfaces), one may think of the deflection of light by the metasurface. Interestingly, the wavefront of the deflected light can be managed by implementing PCMs into the structure of metasurfaces, thereby promising the realization of programmable nanodevices with a wide range of applications. In this work, the focus has been made on the analytical study of a reflective array of meta atoms which can be programmed by thermal excitation. The technique allows for precise local crystallization of the PCMs in infinitesimal sizes far below than achievable sizes by the conventional optical methods. Within the context, a thermal probe has been used to create periodic patterns in the upper PCM layer of a multilayered structure to shape the reflected wavefront. As such, the designed metasurface is a promising lithography free structure which can be realized by the conventional deposition methods. The spectral response of the proposed design has been investigated in the near-infrared regime. The work opens up the possibility of realizing reconfigurable compact nanodevices with potential applications in plasmonic sensing, holographic displays, optical routers and image sensors.
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
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Additive manufacturing (AM) has recently received increased interest by the nanofabrication community. Many small-scale AM techniques have proven to be powerful tools for the fabrication of micron-sized metal structures. One such technique is electrohydrodynamic redox printing (EHD-RP). This technique enables the fabrication of high quality materials at high printing speeds. In this contribution we will present our recent work, furthering the capabilities of EHD-RP. Increased control over the microstructure by tuning printing parameters. Showing the fabrication of semiconducting ZnO, an example for multi-material capabilities. As well as the fabrication of Ag structures with controlled nanoporosity over a range of 40%.
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
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Laser crystallization in amorphous-Si (a-Si) thin film through two-dimensional scanning of 355-nm solid-state laser with a Gaussian spot beam created Si nanoparticles with sizes of 100~200 nm at laser fluences of 150~200 mJ/cm2. The Si nanoparticles having uniform size induced the optical resonances of red, green, and blue (RGB) color depending on the particle sizes. The SEM images revealed the Si nanoparticles are spheroidal shape, embedded in the residual Si layer and the RGB colors of 628 nm, 570 nm, and 495 nm were verified to the dipole resonance as predicted by the MIE theory.
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
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In this work we present a useful procedure to design multiple AWGs by studying the full scope of the key parameters. The proposed strategy allows us to optimize specific characteristics of the spectral response as well as the footprint of AWG devices. A full model of a 1x8-channels AWG beside details of the method used to calculate relevant features were conducted in this work. By this model, we have validated the carried-out methodology and optimized the AWG designs. The relationship between the spectral transmission and the key parameters were also explored. The AWGs were designed on the Silicon-On-Insulator platform.
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
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In this work, with the aim to asses in-vivo cellular proliferation through the tryptophan fluorescence intensity at 345 nm by means of optical fibers, several fluorescent membranes of a polydimethylsiloxane (PDMS) matrix with phosphors particles at different concentrations were fabricated and evaluated. In particular, we evaluate the performance of Eu-activated phosphors absorbing at 345 nm and emitting multiple fluorescence peaks in the 450-650 nm range. We got the thickness and membrane’s efficiency at 345 nm. Other optical and thermal properties were evaluated. These phosphors can be used to attach them to an optical fiber tip and monitoring cellular proliferation.
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
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Flexible Electrochromic Organic Nanofilms (FEON) have drawn intense attention due to their advantages over competing technologies. The method utilized to deposit as well as to integrate solutions and processed materials, manufacturing electrochromic organic nanofilms by the Electrodeposition System, has been presented in this research. The FEON device constructed in this work is electrochromic device are the base Poly (3,4-ethylenedioxythiophene), PEDOT:PSS, Poly(3-hexyl thiophene, P3HT, Phenyl-C61-butyric acid methyl ester, PCBM, Vanadium Pentoxide, V2O5, Lithium Perchlorate, LiClO4 in Propylene Carbonate, PC and Polyaniline, PANI, that were deposited in Indium Tin Oxide, ITO, and characterized by Electrical Measurements and Scanning Electron Microscopy (SEM). In addition, the thin film obtained by the deposition of PANI, prepared in perchloric acid solution, was identified through PANI-X1. The maximum process temperature was 50°C, which corresponds to the baking of the active polymeric layer. The result obtained by electrical Measurements has demonstrated that the PET/ITO/PEDOT:PSS/P3HT:PCBM Blend/V2O5/ LiClO4/PANI-X1/ITO/PET layer presents the characteristic curve of standard electrochromic organic device after spin-coating and electrodeposition. The Thin film obtained by electrodeposition of PANI-X1 on ITO/PET Blend was prepared in perchloric acid solution. The spectrum absorption in the spectral region of 200-1100 nm of the flexible electrochromic organic nanofilm device indicated that the gradual increase of ddp of 0.0 Volt to 5.0 Volt generates a greater deviation in the optical spectral region between 450-850 nm. The thermal effects from ultraviolet irradiation under the device’s surface, in the irradiation simulator chamber, demonstrated a 5% reduction in the device’s lifetime. The inclusion of the PANI-X1 layer reduced the effects of degradation these electrochromic organic nanofilms induced for solar irradiation, a fact that also observed in the irradiation in the simulation chamber. In Scanning Electron Microscopy (SEM) these studies reveal that the surface of PANI-X1 layers is strongly conditioned by the surface morphology of the dielectric.
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
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Plasmonic nanoparticles offer building block opportunities for many future optical applications. Controlling the optical properties of such material can be a difficult process with complex synthesizing routes. We have developed a new low powered nanoengineering instrument with optoelectronic elements that designs the optical responses of the nanoparticle through carefully manipulating the nano-morphology.
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
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AT-TFT has been demanding for next generation flat panel display. we investigated the characteristic of amorphous IZO based AT-TFT (a-IZO AT-TFT) device and fabricated amorphous IZO thin films as a channel and electrode layer prepared by RF magnetron sputtering process. Due to the difference of the characteristics required by the channel layer and the electrode layer, we adjust the ratio of [In/Zn] to exhibit the required characteristics of each layer. We optimized in various conditions for high quality of the layers. The optimized device has quite good performance as TFT driving display.
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Transition Metal Dichalcogenides (TMDs) exhibit a wide range of electronic properties, since they occur as semiconductors, metals, semimetals and superconductors. MoTe2 epilayers are deposited on GaAs(111)B substrates using MBE. The epitaxial relations, strain, the presence of defects, morphology of the layers as well as the smoothness of GaAs/MoTe2, MnTe/MoTe2 and NiTe2/MoTe2 interfaces were investigated with transmission electron microscopy methods. The thin cross-sections of the as-grown samples were prepared with FIB. Depending on the growth conditions, the atomically flat, smooth or porous, moss-like layers are obtained with different contribution of 2H, 1T’ MoTe2 and Mo6Te6 phases.
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Due to thermal decomposition of wurtzite (WZ) (Ga,Mn)As, the formation of tensely strained MnAs nanocrystals takes place in WZ-GaAs, leading to the stabilization of ferromagnetic α-MnAs phase to above 127⁰C. WZ-(Ga,Mn)As can be fabricated only as a shell in nanowire (NW) geometry, hence two types of MBE core-shell NWs are investigated: 1) (Ga,In)As/(Ga,Al)As/(Ga,Mn)As/GaAs, 2) GaAs/(Ga,Al)As/(Ga,Mn)As/(Ga,Al)As/GaAs. We will discuss how the structural evolution of such systems can be tuned by annealing time and temperature, Mn-content and the presence of (Ga,Al)As separating shells. Using in-situ TEM, we will show the real-time annealing induced structural changes in individual NWs at high spatial resolution.
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
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In this paper, we demonstrate the approach of obtaining an array of ZnO nanowires, deposited as a thin film on different substrates (glass, Si plate, foil, etc.). As-obtained ZnO thin films have a hydrophilic state with water droplets with a contact angle value of 0°. Treatment of ZnO thin films with H2 gas (under specific conditions) changes the state of ZnO thin films to a hydrophobic state with a roll-off angle with the droplet of water 60°. However, ZnO thin films treatment with O2 gas makes ZnO thin films go back to a hydrophilic state. This operation can be repeated in a cycle manner using H2 and O2 gases to approach different states of ZnO thin films such as hydrophilic and hydrophobic. Thin films of ZnO nanowires can be deposited on a variety of substrates such as glasses, metals, and polyamides.
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
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With the intent to produce economically viable photonic devices, we present the use of silicon nitride devices on quartz substrates as opposed to conventional silicon on insulator (SOI) substrates. Silicon nitride (SiN) optical devices present an opportunity to reduce overall loss of a device in c-band. Our research group has modeled and demonstrated a fiber-optic prototype for A/D based on delta-sigma modulation. We will show photonic SiN devices on quartz substrate result in improvements in a speed proportional to size reduction in a PIC A/D chip. We will also present our results and findings of this new approach.
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
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In this proceeding, we search for an optimized substrate towards live cell imaging in culture medium for surface plasmon microscopy with high sensitivity. Coverslips coated with nano-metric bimetallic gold and silver best serves the purpose.
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
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In this work we utilized the phase-change properties of Vanadium Dioxide in a planar thermal-regulation device. We optimized the geometry of this planar device to maximize the tunable total emittance, which we define as the difference in normalized radiated power between the metallic and insulating states of VO2 at the phase transition temperature. A single-layer Fabry Perot device consisting of VO2, ZnSe, and Au achieves a tunable total emittance of 0.574 in simulation. A multilayer device utilizing a second Fabry Perot cavity of the same materials increases the simulated total tunable emittance to 0.69.
22 August 2022 • 5:30 PM - 7:30 PM PDT | Conv. Ctr. Exhibit Hall B1
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Electrochemical Raman-enhanced spectroscopy (EC-SERS) is an emerging detection method. By applying a potential to the substrate metal surface, the analyte can be adsorbed on the substrate. Because the detection is performed in a liquid state, the analyte can be distributed more evenly across the surface. It also reduces the lead time required for the analytes to deposit and dry on the substrate, with the advantage of being faster and more accurate. In addition, gold-silver composite nanoparticles have a better Raman signal enhancement effect than single metal nanoparticles. In this study, we investigated electrochemical surface-enhanced Raman scattering (EC-SERS) enhancement on moth-eye nanostructured pc substrates decorated with Au@Ag core-shell nanoparticles. We found that Au/Ag core-shell thickness and Au@Ag nanoparticle diameter affect EC-SERS enhancement. Finally, the gold/silver core-shell thickness on top of the moth-eye structured pc substrate was optimized to obtain a substrate with better EC-SERS enhancement.