Gyrotropic isoindex filter.
The zero crossing of the birefringence coupled with natural optical activity in certain uniaxial crystals can be utilized to build a narrowband and wide field-of-view filter. Coupled mode analysis is employed to investigate the field-of-view and passband characteristics of such a spectral filter.
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Rockwell International Science Center, P.O. Box 1085, Thousand Oaks, California 91360, USA.