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Proceedings Paper

Directed assembly of colloidal particles for micro/nano photonics (Conference Presentation)
Author(s): Yuebing Zheng

Paper Abstract

Bottom-up fabrication of complex structures with chemically synthesized colloidal particles as building blocks pave an efficient and cost-effective way towards micro/nano photonics with unprecedented functionality and tunability. Novel properties can arise from quantum effects of colloidal particles, as well as inter-particle interactions and spatial arrangement in particle assemblies. Herein, I discuss our recent developments and applications of three types of techniques for directed assembly of colloidal particles: moiré nanosphere lithography (MNSL), bubble-pen lithography (BPL), and optothermal tweezers (OTTs). Specifically, MNSL provides an efficient approach towards creating moiré metasurface with tunable and multiband optical responses from visible to mid-infrared regime. Au moiré metasurfaces have been applied for surface-enhanced infrared spectroscopy, optical capture and patterning of bacteria, and photothermal denaturation of proteins. BPL is developed to pattern a variety of colloidal particles on plasmonic substrates and two-dimensional atomic-layer materials in an arbitrary manner. The laser-directed microbubble captures and immobilizes nanoparticles through coordinated actions of Marangoni convection, surface tension, gas pressure, and substrate adhesion. OTTs are developed to create dynamic nanoparticle assemblies at low optical power. Such nanoparticle assemblies have been used for surface-enhanced Raman spectroscopy for molecular analysis in their native environments.

Paper Details

Date Published: 28 April 2017
PDF: 1 pages
Proc. SPIE 10115, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics X, 101150J (28 April 2017); doi: 10.1117/12.2250932
Show Author Affiliations
Yuebing Zheng, The Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 10115:
Advanced Fabrication Technologies for Micro/Nano Optics and Photonics X
Georg von Freymann; Winston V. Schoenfeld; Raymond C. Rumpf, Editor(s)

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