Abstract

We propose a planar long-period grating filter based on coupling between the long-range surface plasmon mode and a cladding mode of a fully buried metal stripe waveguide. Using a 2.5-mm-long corrugation grating produced along the surface of an epoxy-clad aluminum stripe waveguide, we achieve a rejection band with a contrast of ~18 dB at the wavelength ~1500 nm, which can be tuned by ~25 nm with a temperature change of ~30°C. The experimental results agree closely with the simulation results. The filter could find applications in surface-plasmon-based integrated-optic circuits and biosensors.

©2010 Optical Society of America

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