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Tunable coupling between exciton and surface plasmon in liquid crystal devices consisting of Au nanoparticles and CdSe quantum dots

Authors :
Chun-Hsiung Wang
Chun-Chih Liu
Chih-Wei Chen
Yang-Fang Chen
Chung-Tse Chen
Source :
Applied Physics Letters. 98:261918
Publication Year :
2011
Publisher :
AIP Publishing, 2011.

Abstract

We report controllable coupling between exciton and localized surface plasmon in a liquid crystal device consisting of gold nanoparticles and CdSe quantum dots. Through an external electric voltage, the emission wavelength of quantum dots can be manipulated. The underlying mechanism is based on the fact that by changing the dielectric index of liquid crystal with an external bias, the surface plasmon frequency of metal nanoparticles can be adjusted. It is therefore possible to control the energy difference between exciton and surface plasmon resonance, and hence to change their coupling strength. Our strategy may open up a possible route for the development of smart optoelectronic devices with tunable emission color.

Details

ISSN :
10773118 and 00036951
Volume :
98
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........f11f81f1256e000cb1cbe3551cf1afde
Full Text :
https://doi.org/10.1063/1.3606539