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Proceedings Paper

Backward wave phenomenon for light propagating through a silver nanorod array
Author(s): Yi-Jun Jen; Ching-Wei Yu; Chin-Te Lin
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Paper Abstract

In this work, we use glancing angle deposition (GLAD) to fabricate a silver nanorod array. The average tilt angle and diameter of the silver nanorod are 65° ± 5 and 323 nm, respectively. When the array is illuminated by normal incident light, oscillating electric field parallel to the rod and perpendicular to the rod would induce the transverse and longitudinal plasmon resonant modes. As the longitudinal plasmon mode occurs, the absorption of the array with thickness 323nm is enhanced and the TM mode transmittance is reduced to be 0.3 percentages. The transmitted ellipsometric parameters are measured and the phase difference between TE mode and TM mode transmission coefficients is detected. The absolute transmission coefficient is measured by walk-off interferometer. Compared with the relative phase, the phase of TM mode transmission coefficient becomes a negative value. It is proposed here that a wave propagates through the "effective thin film" and acts like a backward wave in the film.

Paper Details

Date Published: 2 September 2009
PDF: 8 pages
Proc. SPIE 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII, 73942F (2 September 2009); doi: 10.1117/12.825780
Show Author Affiliations
Yi-Jun Jen, National Taipei Univ. of Technology (Taiwan)
Ching-Wei Yu, National Taipei Univ. of Technology (Taiwan)
Chin-Te Lin, National Taipei Univ. of Technology (Taiwan)

Published in SPIE Proceedings Vol. 7394:
Plasmonics: Metallic Nanostructures and Their Optical Properties VII
Mark I. Stockman, Editor(s)

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