Bandwidth tunable optical filter based on a tri-mode high-contrast grating

2022/06/28 by Hsin-Yu Yao, Yao, Hsin-Yu, Yi‐Chen Wang +5
Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Optical Coatings and Gratings #Optics (physics.optics) #Photonic Crystals and Applications #Photonic and Optical Devices

paper · pdf · doi:10.48550/arxiv.2206.13771

openalex publication_date 2022/06/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We propose a monolithic optical bandpass filter with a transmission bandwidth tunable by the incident angle in a tri-mode high-contrast grating (HCG). We attribute this extraordinary phenomenon to the destructive interference between the TM₀ and TM₂ modes and the Fabry-Pérot resonance of the TM1 mode, which can only be excited at the oblique incidence. The transmission bandwidth can be tuned from zero at normal incidence and increases quadratically with incident angle, while the center wavelength reds shifts slightly. The corresponding Q factor can be continuously tuned from 10⁶ to 10² as the incident angle increases from nearly 0^o to 10^o.

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