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APL: Organic Electronics and Photonics / Volume 5 / Issue 1 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 100, 013305 (2012); http://dx.doi.org/10.1063/1.3673872 (3 pages)

Optical microcavities with a thiol-functionalized gold nanoparticle polymer thin film coating

Ce Shi1, Hong Seok Choi1, and Andrea M. Armani1,2

1Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, 3651 Watt Way, Los Angeles, California 90089, USA
2Ming Hsieh Department of Electrical Engineering-Electrophysics, University of Southern California, 3651 Watt Way, Los Angeles, California 90089, USA

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(Received 14 July 2011; accepted 12 December 2011; published online 4 January 2012)

Polymer coatings endow ultra-high-Q dielectric resonators with nonlinear properties, impacting numerous applications. However, minimal research combining microcavities with polymer-nanoparticle coatings to tune or tailor the optical properties of the system has been performed. One challenge is maintaining the high performance of the optical device while in the presence of nanoparticles. In the present work, a toroidal microcavity is coated with a polymethylmethacrylate thin film containing thiol-functionalized gold nanoparticles. The thiol-functionalization ensures that the nanoparticles are uniformly distributed throughout the film. The quality factors of these devices are above 5 × 106 and are in good agreement with the theoretical predictions.

© 2012 American Institute of Physics

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KEYWORDS and PACS

Keywords

gold, microcavities, micro-optics, nanoparticles, nanophotonics, optical films, optical polymers, Q-factor, thin films

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3673872

PUBLICATION DATA

ISSN

1941-420X (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (click on thumbnails to view enlargements)

FIG.1
(Color online) (a) Artistic rendering and (b) optical image of the gold coated hybrid devices. Gold nanoparticles suspended in a PMMA solution are coated onto the toroid surface. The major diameter for the microtoroid is approximately 50 μm. The gold nanoparticles are too small to visualize in this optical image.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
(Color) FEM simulations of the optical field distribution. (a) The normalized radial optical field intensity as a function of radius for silica (solid black line) and for 10% PMMA-nanoparticle nanocomposite film (red dashed line). The zero point indicates the center of the minor diameter. This graph was determined from the optical field distribution for (b) silica microtoroid and (c) nanoparticle-polymer coated microtoroid with a 30 nm thick film. The device size is 50(5) μm major (minor) diameter and operating wavelength is 633 nm.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
(Color online) Schematic of synthesis for thiol-stablized gold nanoparticles. First a gold hydrosol is synthesized. Then, to replace the –OH on the surface with –SH, a small amount of 1-dodecanethiol is added, and the gold was transferred completely to toluene.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.4
(Color online) Experimental (solid squares) and theoretical (hollow circles) quality factor of hybrid devices as a function of gold concentrations in PMMA film at (a) 633 nm, (b) 765 nm, and (c) 980 nm. The results were fit according to the equation of y = axb.

FIG.4 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

Supplemental Files (EPAPS)

Tables

Table I. Summary of model and experimental fitting parameters.

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