Design of photonic-crystal-modulated narrowband multichannel filters for visible light with high transmittance

Tianxin Wang; Shuai Wang; Bo Gao; Weixing Yu

doi:10.1117/12.3007882

18 December 2023 Design of photonic-crystal-modulated narrowband multichannel filters for visible light with high transmittance

Tianxin Wang, Shuai Wang, Bo Gao, Weixing Yu

Author Affiliations +

Proceedings Volume 12962, AOPC 2023: Optical Spectroscopy and Imaging; and Atmospheric and Environmental Optics; 129620C (2023) https://doi.org/10.1117/12.3007882
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

In this study, we introduce a novel approach for achieving narrowband filters in hyperspectral imaging spectrometers. By embedding photonic crystals within distributed Bragg reflectors (DBRs), we create resonant structures. Through meticulous simulations, we optimize a four-layer DBR configuration, resulting in spectral channels with a 3 nm average FWHM and exceeding 99% peak transmittance. Our key innovation lies in using photonic crystals to modulate transmission. By introducing TiO2 periodic structures, we control the effective refractive index and there by tune transmission wavelengths. The method covers a 475-625 nm spectral range with exceptional transmittance. We also investigate incident light angle effects, revealing systematic shifts in transmission peak. Our design offers adaptability by adjusting DBR film thickness for defining operational ranges and selecting TiO2 cylinder radii for precise channel manipulation. Our approach simplifies fabrication and holds potential for cost-effective hyperspectral imaging filters.

Citation Download Citation

Tianxin Wang, Shuai Wang, Bo Gao, and Weixing Yu "Design of photonic-crystal-modulated narrowband multichannel filters for visible light with high transmittance", Proc. SPIE 12962, AOPC 2023: Optical Spectroscopy and Imaging; and Atmospheric and Environmental Optics, 129620C (18 December 2023); https://doi.org/10.1117/12.3007882

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KEYWORDS

Tunable filters

Photonic crystals

Optical filters

Design and modelling

Refractive index

Imaging spectroscopy

Manufacturing

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