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A cavity-resonator-integrated guided-mode resonance filter (CRIGF) is a type of narrowband wavelength filter for an incident free-space beam of small diameter. A CRIGF consists of a grating coupler (GC) and a pair of distributed Bragg reflectors used to construct a waveguide cavity resonator. This time, the dependence of the reflection spectrum on the relative position of the centers of the GC and...
A cavity-resonator-integrated guided-mode resonance filter consisting of a grating coupler (GC) between two distributed Bragg reflectors can provide a narrowband reflection spectrum. Reductions in reflectance and reflection line width by a position shift of the GC from the center in the waveguide cavity are discussed by using the coupled-mode analysis.
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