Abstract
Guided-mode resonance fllters (GMRFs) are highly compact structures that can produce a strong frequency response from a single thin layer of dielectric. When a GMRF is formed onto a curved surface, the local angle of incidence varies over the aperture of the device and the overall performance signiflcantly degrades. In the present work, we spatially varied the grating period of a curved GMRF to perfectly compensate for the local angle of incidence. The performance of our curved device actually surpassed that of our ∞at device because it also compensated for the spherical wave front from the source. This paper summarizes our design process and experimental results obtained around 25GHz.
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