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SPIE Microtechnologies 2017 poster session

Tuesday afternoon's poster session was one of many opportunities to discuss the
latest research;
browse below to see highlights of the conference and a sampling of talks.

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SPIE Microtechnologies 2017 SPIE Microtechnologies 2017 SPIE Microtechnologies 2017


Welcome to Barcelona!

Ulrich Schmid, SPIE Microtechnologies 2017

Ulrich Schmid
Carles Cané, SPIE Microtechnologies 2017

Carles Cané

SPIE Microtechnologies 2017 symposium chair Ulrich Schmid of Technische Universität Wien opened the event Monday morning, inviting attendees to take advantage of the synergies created among the four conferences running during the week and the presence of engineers, scientists, researchers, and managers working on various aspects of microtechnologies.

Local co-chair Carles Cané, Centro Nacional de Microelectronia, welcomed participants to Barcelona, which is serving as host to the conference once again.


Scaling for the 'internet of everything'

Luca Benini, SPIE Microtechnologies 2017

Luca Benini

Luca Benini, Università degli Studi de Bologna, in the first of the week's plenary talks, spoke Monday morning on the energy efficiency challenge and smart integrated microsystems.

The "internet of everything" envisions trillions of connected objects loaded with high-bandwidth sensors requiring massive amounts of local signal processing, fusion, pattern extraction, and classification, Benini said. From the computational viewpoint, the challenge is formidable and can be addressed only by pushing computing fabrics toward massive parallelism and brain-like energy efficiency levels.

While CMOS technology can still take us a long way toward this goal, but technology scaling is losing steam, he said.

Energy efficiency improvement will increasingly hinge on architecture, circuits, design techniques such as heterogeneous 3D integration, mixed-signal preprocessing, event-based approximate computing and non-Von-Neumann architectures for scalable acceleration.


Coffee with colleagues old and new

SPIE Microtechnologies 2017, coffee break at the Hotel Alimara

Attendees enjoyed a coffee break at sunny Barcelona's Hotel Alimara on opening day.
SPIE Microtechnologies 2017, coffee break at the Hotel Alimara SPIE Microtechnologies 2017, coffee break at the Hotel Alimara
SPIE Microtechnologies 2017, coffee break at the Hotel Alimara SPIE Microtechnologies 2017, coffee break at the Hotel Alimara


Nano approaches for faster communications

Carsten Ronning, SPIE Microtechnologies 2017

Carsten Ronning, in a session on luminescence and light-emitting devices

Among speakers early in the week, Carsten Ronning, Friedrich-Schiller-Universität Jena, gave a talk Monday afternoon in the conference on Nanotechnology on dynamics and emission characteristics of semiconductor nanowire lasers (10248-6).

The growing demand for faster communications technologies and the inherent limitations of electronic integrated circuits stimulated the research of nanophotonic components accompanied by the urgent need for nanoscale light sources, he noted.

The demonstration of laser emission from single semiconductor nanowires makes them interesting to accomplish these demands in generating highly localized intense monochromatic light as they mark the lower size limit of photonic laser systems.


Beautiful evening for networking

SPIE Microtechnologies 2017 welcome reception

Monday evening offered a chance for networking at the harborside restaurant 1881 per Sagardi.
SPIE Microtechnologies 2017 welcome reception SPIE Microtechnologies 2017 welcome reception
SPIE Microtechnologies 2017 welcome reception


Innovations in MEMS microphones

Alfons Dehe at SPIE Microtechnologies 2017

Alfons Dehé

After decades of research and more than ten years of successful production in very high volumes, silicon MEMS microphones are mature and unbeatable in form factor and robustness, observed plenary speaker Alfons Dehé of Infineon Technologies AG on Tuesday morning.

In an overview of state-of-the-art MEMS technology and a look at the future, Dehé described how technologies such as the comb sensor microphone will be applied.

Currently, audio applications such as video, noise cancellation, and speech recognition — key differentiators in smart phones — are enabled by microphones with low self-noise, he noted.

Backplate-free microphones enter the signal-to-noise ratios above 70dB(A).


An afternoon of posters

Tuesday afternoon's poster session provided ample opportunity to view reports on new research and discuss the work with the authors over refreshments.

SPIE Microtechnologies 2017 poster session SPIE Microtechnologies 2017 poster session
SPIE Microtechnologies 2017 poster session SPIE Microtechnologies 2017 poster session
SPIE Microtechnologies 2017 poster session


Synthesizing silver nanoparticles

Rebecca Mfon at SPIE Microtechnologies 2017

Rebecca Mfon

In the Nanotechnology conference on Tuesday afternoon, Rebecca Mfon of the University of Bristol described a new process for synthesizing silver nanoparticles by a direct method (10248-27).

The team used aqueous silver nitrate and two different leaf extracts, and assessed structure and morphology of the resulting nanoparticles via several methods.

While the conventional method gave nanoparticles whose sizes and shapes were dependent on the concentration of the precursor materials used, the faster electrodeposition method produced nanostructures whose sizes and shapes were more uniform and dependent on the leaf extract used as well as the deposition conditions controlling the rate of silver growth on the substrate used.


Silicon waveguides for multiple wavelengths

Carlos Alonso-Ramos at SPIE Microtechnologies 2017

Carlos Alonso-Ramos

While the large transparency window of silicon makes it a promising material for the implementation of on-chip sensors operating over an ultra-wide wavelength range, the implementation of the silicon-on-insulator platform is restricted by the absorption of buried oxide layer for wavelengths above 4 µm.

Carlos Alonso-Ramos of Université Paris Sud  reported Tuesday afternoon in the Integrated Photonics conference on advances in development of silicon waveguides for broadband operation extending from near- to mid-infrared wavelengths (10249-9).

He described suspended silicon waveguides that exploit a novel periodic corrugation approach to circumvent the buried oxide absorption problem and provide effective single-mode operation simultaneously for near- and mid-infrared wavelengths.


Graphene for bioelectronics and neuroprosthetics

Jose Garrido at SPIE Microtechnologies 2017

Jose Garrido

Establishing a reliable bidirectional communication interface between the nervous system and electronic devices is crucial for exploiting the full potential of neural prostheses.

In a plenary talk Wednesday morning, Jose Garrido of the Institut Català de Nanociència i Nanotecnologia discussed pros and cons of graphene technologies for bioelectronics and neuroprosthetics, and identified the primary challenges for future developments.

Despite recent advances, current microelectrode technologies evidence shortcomings such as challenging high-density integration, low signal-to-noise ratio, and poor long-term stability. Graphene and graphene-based materials possess a rather exclusive set of physicochemical properties, he noted, and so hold great potential for biomedical applications, in particular neural prostheses.

Efforts to explore novel materials are essential for the development of next-generation neural prostheses, Garrido said.


Loss assessment in cochlear implants

Maria-Alexandra Paun at SPIE Microtechnologies 2017

Maria-Alexandra Paun

Maria-Alexandra Paun of the Ecole Polytechnique Fédérale de Lausanne described in a talk Wednesday morning in the conference on BioMEMS and Medical Microdevices results of research on a multilayered tissues model for wave propagation loss assessment in cochlear implants (10247-1).

The study involved power loss attenuation of the plane wave travelling through tissue layers, from the outside to the inside of the skull within a cochlear implant. Different implantation depths of the internal antenna, from 10 to 50 mm, were evaluated to assess gain and attenuation in dB.

Researchers developed a multilayer tissue model consisting primarily of skin, mastoid bone, and brain, and performed an s-parameter analysis using loop antennas and pork head tissue.


Towards quantum sensing on-chip

Tobias Gehring at SPIE Microtechnologies 2017

Tobias Gehring

Accurate parameter estimation plays a pivotal role in basic as well as applied sciences, noted Tobias Gehring, Technical University of Denmark, in an invited talk Wednesday morning in the conference on Integrated Photonics on progress toward an integrated squeezed light source (10249-13).

The ultimate precision limits in the estimation procedure are dictated by the quantum fluctuations of the probing state, Gehring said. For example, using coherent states, the precision scaling is 1/Sqrt(N) while for NOON states the scaling is 1/N where N is the number of probing photons.

The latter is the ultimate scaling known as the Heisenberg scaling. Gehring demonstrated that the Heisenberg scaling can be attained also by the use of squeezed states of light — an important result as the squeezed state is much easier to produce and much more robust against losses than the NOON state.

Gehring also described the group’s also recent work on miniaturizing squeezed states sources, towards quantum sensing on-chip.


All photos © SPIE, the international society for optics and photonics, except where noted.

SPIE Microtechnologies

8 – 10 May 2017
Barcelona, Spain



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