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Angular tolerant resonant grating filters under oblique incidence

2005; Optica Publishing Group; Volume: 22; Issue: 3 Linguagem: Inglês

10.1364/josaa.22.000475

1520-8532

Anne Sentenac, Anne-Laure Fehrembach,

Photonic Crystals and Applications

Resonant grating filters have been proposed as a promising alternative to multilayer stacks for narrowband free-space filtering. The efficiency of such filters under normal incidence has been demonstrated. Unfortunately, under oblique incidence, the limited angular tolerance of the resonance forbids any filtering applications with use of standard collimated incident beams. Using a multimode planar waveguide and a bi-atom grating, we show how to increase the angular tolerance up to the divergence of standard beams (0.2 deg) without modifying the spectral bandwidth (0.1 nm), under any oblique angle of incidence.