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Attenuated total reflectance from a layered silver grating with coupled surface waves

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Abstract

We consider the experimental and calculated reflectance of Nd:YAG laser radiation from a thin silver grating bounded by matched dielectric media. A grating with 1200 lines/mm and a peak-to-valley depth of 270 Å is ionetched into a quartz crystal. A silver film is evaporated onto the quartz grating, and a second quartz crystal is optically contacted to the top grating surface to complete the layered structure. The reflectance of the grating layers is calculated by using reduced Rayleigh equations extended to the double-boundary geometry. For a silverfilm thickness of 520 Å the splitting of the single-boundary surface-plasmon mode into two coupled modes is observed, and the experimental attenuated total reflection is in good agreement with that calculated. However, for the thinnest film studied, 140 Å, the observed resonance is shallower and broader than that predicted because of scattering of the long-range surface-plasmon mode from the grating grooves.

© 1988 Optical Society of America

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