[13a-N103-1~9] 3.14 Optical control devices and optical fibers

[13a-N103-3] Basic study on a narrow-bandpass filter using orthogonally propagating guided-mode resonance with doubly-periodic structure

〇(M1)Zhiyu Yang¹, Ryo Asai¹, Junichi Inoue¹, Kenji Kintaka², Shogo Ura¹ (1.Kyoto Inst. Tech., 2.AIST)

Keywords:guided-mode resonance filter

A waveguide mode resonance filter is configured by integrating a sub-wavelength period grating on a transparent substrate, and usually requires a filter diameter of several hundred µm due to the narrowband characteristics of the sub-nm. In this study, we proposed and examined a two-dimensional grating structure with a double period grating as a narrow-band bandpass filter with a small diameter. Under the condition that a Gaussian beam with a diameter of 45 µm was an incident on a filter of 85 µm diameter, a transmission spectral with a maximum transmittance of 96% and an FWHM of 0.5 nm was confirmed by the Finite Difference Time Domain Method.