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Proceedings Paper

Multiple surface gratings on azopolymers for generating surface plasmons
Author(s): Paul Rochon; Luc Levesque
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Paper Abstract

Surface relief gratings are optically inscribed on azobenzene polymer films. Multiple gratings can be inscribed on the same spot either simultaneously or sequentially by projecting a holographic pattern onto the surface. The grating pitch can range from 350 nm to 1.5 μm and depths can easily reach 400 nm. The inscription is done at room temperature, in air using a 100 mW/cm2 beam for 1 to 5 minutes. In the present study we inscribe two sinusoidal gratings and coat the surface with a 20 nm thin film of gold. Light incident onto this structured surface is coupled into a surface plasmon when the appropriate angle of incidence and wavelength are selected. The coupling condition can be observed in the reflection spectrum from the surface. A dispersion curve for the plasmon propagation can then be produced by studying the reflection spectrum as a function of the angle of incidence. By using two gratings as couplers, a surface plasmon standing wave can be produced for a selected incident light wavelength.

Paper Details

Date Published: 8 September 2006
PDF: 4 pages
Proc. SPIE 6343, Photonics North 2006, 634338 (8 September 2006); doi: 10.1117/12.707984
Show Author Affiliations
Paul Rochon, Royal Military College of Canada (Canada)
Luc Levesque, Royal Military College of Canada (Canada)

Published in SPIE Proceedings Vol. 6343:
Photonics North 2006
Pierre Mathieu, Editor(s)

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