Abstract

Resonant grating filters are promising components for free-space narrowband filtering. Unfortunately, due to their weak angular tolerance, their performances are strongly deteriorated when they are illuminated with a standard collimated beam. Yet this problem can be overcome by resorting to a complex periodic pattern known as the doubly periodic grating [Lemarchand et al., Opt. Lett. 23, 1149 (1998)] . We report what we believe to be the first experimental fabrication and characterization of a bidimensional doubly periodic grating filter. We obtained a 0.5nm bandpass polarization independent reflection filter for telecom wavelengths (1520–1570nm) that presents a transmittivity minimum of 18% with a standard incident collimated beam.

© 2007 Optical Society of America

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