[18a-A202-1~8] 3.13 Optical control devices and optical fibers (formerly 3.14)

[18a-A202-3] Design of Narrowband Flat-top Guided-mode Resonance Filter with Asymmetric Doubly Periodic Grating

〇Seita Ishioka¹, Zhiyu Yang¹, Shogo Ura¹, Junichi Inoue¹, Kenji Kintaka² (1.Kyoto Inst. Tech., 2.AIST.)

Keywords:guided mode resonance, bandpass filter, subwavelength grating

A guided-mode resonance filter (GMRF) is a narrowband reflection filter consisting of a sub-wavelength grating integrated in a waveguide on a transparent substrate. In this study, asymmetric doubly periodic gratings with two teeth and two spaces of different widths in a single period are considered to form a flat-top shape in the GMR reflection spectrum. A narrowband flat-top reflection spectrum with a full width at half maximum of 4 nm was designed and confirmed by using the rigorous coupled-wave analysis.