Nonpolarizing guided-mode resonant grating filter for oblique incidence.
- 1 June 2001
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America A
- Vol. 18 (6), 1261-1266
- https://doi.org/10.1364/josaa.18.001261
Abstract
A new type of guided-mode resonant grating filter is described. The filter is independent of polarization state for oblique incidence. The filter has a crossed grating structure, and the plane of incidence on the filter contains the symmetric axis of the grating structure. Theoretical considerations and numerical calculations using two-dimensional rigorous coupled-wave analysis show that a rhombic lattice structure is suitable to such filters. In this configuration an incident light wave is diffracted into the waveguide and is divided into two propagation modes whose directions are symmetric with respect to the plane of incidence. In particular, when the propagation directions of the two modes are perpendicular to each other, the fill factor of grating structure can be approximately 50%. The filter was designed for an incident angle of 45 degrees. Tolerances of setting errors and fabrication errors for this filter were estimated by numerical calculations.Keywords
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