We propose an optical component for widely tunable, narrow-band filtering. It takes advantage of the tunability properties, with respect to the angle of incidence, of guided-mode resonance filters. The intrinsic polarization sensitivity of the resonances is suppressed by exciting the modes through two identical, differently oriented one- dimensional gratings flanking a thick substrate. An example is provided that theoretically shows a polarization independent peak at with a Q factor of 13,000 and a reflectivity greater than 99% at resonance, which is tunable over . Finally, we discuss the fabrication limitations and conclude that the proposed configuration is realistic.
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