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All-Optical Active Plasmonics Based on Ordered Au Nanodisk Array Embedded in Photoresponsive Liquid Crystals

Published online by Cambridge University Press:  01 February 2011

Yue Bing Zheng ,
Vincent K. S. Hsiao  and
Tony Jun Huang
Vincent K. S. Hsiao
Affiliation:
vincent1972@gmail.com, Pennsylvania State University, Department of Engineering Science and Mechanics, 212 Earth-Engineering Sciences Building, University Park, PA, 16802, United States
Tony Jun Huang
Affiliation:
junhuang@psu.edu, Pennsylvania State University, Department of Engineering Science and Mechanics, 212 Earth-Engineering Sciences Building, University Park, PA, 16802, United States
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Abstract

We propose a new approach towards all-optical active plasmonics based on ordered Au nanodisk arrays embedded in azobenzene-doped liquid crystals (LCs). Upon photoirradiation, the doped LCs went through phase transition induced by trans-cis photoisomerization of the azobenzene molecules. The phase transition led to the change in the refractive index of the LCs experienced by incident light, and enabled reversible tuning of the localized surface plasmon resonance (LSPR) of the embedded Au nanodisks. The tuning utilized the sensitivity of the LSPR of the Au nanodisks to the change in the surroundings' refractive index. Experimental observations on both peak shift and intensity change of the LSPR matched those from discrete dipole approximation (DDA) calculations.

Keywords

liquid crystaloptical propertiesnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1077: Symposium L – Functional Plasmonics and Nanophotonics , 2008 , 1077-L01-04
Copyright
Copyright © Materials Research Society 2008

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