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Proceedings Paper

Using periodic metallic nanostructure for compact optical sensor to detect refractive index change
Author(s): E. Chow; L. Gao; A. Grot; M. Sigalas; S. Crozine; Z. Wang; S. Fan
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Paper Abstract

We demonstrate a compact optical transducer (~50μm) based on a gold film perforated with a square array of square holes. The lattice constant (separation between nearest holes) is chosen to be a ~1μm to detect refractive index change around (n~1.4) with resonant wavelength (λ~1.5μm). Both reflectance measurement and finite difference time domain (FDTD) simulations are performed to evaluate the performance of the sensors. The responsivity of the resonant wavelength is measured to be Δλ/Δn ~835nm RIU-1 (RIU= refractive index unit). The linewidth and contrast of resonance are compared with different size of holes from experimental measurement and FDTD simulations. Coupled mode theory analysis is also used to understand the change reflectance spectrum as a function of hole width.

Paper Details

Date Published: 26 August 2005
PDF: 6 pages
Proc. SPIE 5927, Plasmonics: Metallic Nanostructures and Their Optical Properties III, 59271C (26 August 2005); doi: 10.1117/12.614955
Show Author Affiliations
E. Chow, Agilent Technologies, Inc. (United States)
L. Gao, Univ. of Colorado, Boulder (United States)
A. Grot, Agilent Technologies, Inc. (United States)
M. Sigalas, Agilent Technologies, Inc. (United States)
S. Crozine, Agilent Technologies, Inc. (United States)
Z. Wang, Stanford Univ. (United States)
S. Fan, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 5927:
Plasmonics: Metallic Nanostructures and Their Optical Properties III
Mark I. Stockman, Editor(s)

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