Bragg-grating engineering enables deterministic resonance control in an on-chip THz filter

On-chip filters are important for integrated terahertz (THz) communication and sensing systems. Deterministic control of resonance multiplicity in compact devices enables flexible spectral filtering. Here, we experimentally demonstrate an on-chip silicon THz filter based on a Bragg-grating-assisted Fabry–Pérot cavity, in which the resonance multiplicity is governed by the relation between the Bragg stopband and the cavity free spectral range (FSR). By engineering this stopband–FSR relation, single-, double-, and triple-resonance states are achieved within the 360–390 GHz band, with a packaged insertion loss of approximately 6 dB. The single-resonance device exhibits a through-port transmission minimum approaching −40 dB and a loaded quality factor of QL = 809.5. This work provides a compact strategy for deterministic spectral-state engineering in integrated THz filters.

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Publication Details

Journal
Applied Physics Letters
Published
2026-08-03
DOI
https://doi.org/10.1063/5.0344987
Primary Topic
Terahertz technology and applications
Type
article
Field-Weighted Citation Impact
0.00

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article

Bragg-grating engineering enables deterministic resonance control in an on-chip THz filter

Jian Chen, Xiaoqing Jia, Liang Cheng, Xuecou Tu et al.
Applied Physics Letters
Terahertz technology and applications
article

Bragg-grating engineering enables deterministic resonance control in an on-chip THz filter

Jian Chen, Xiaoqing Jia, Liang Cheng, Xuecou Tu, Labao Zhang, Peiheng Wu, Qingyuan Zhao, Lin Kang, Chao Wan, Dingxuan Gu, Bingnan Yan, Zhanzhang Mai, Yunjie Rui, Hongshan Jing, Xu Yan, Baoran Lai
article en

Abstract

On-chip filters are important for integrated terahertz (THz) communication and sensing systems. Deterministic control of resonance multiplicity in compact devices enables flexible spectral filtering. Here, we experimentally demonstrate an on-chip silicon THz filter based on a Bragg-grating-assisted Fabry–Pérot cavity, in which the resonance multiplicity is governed by the relation between the Bragg stopband and the cavity free spectral range (FSR). By engineering this stopband–FSR relation, single-, double-, and triple-resonance states are achieved within the 360–390 GHz band, with a packaged insertion loss of approximately 6 dB. The single-resonance device exhibits a through-port transmission minimum approaching −40 dB and a loaded quality factor of QL = 809.5. This work provides a compact strategy for deterministic spectral-state engineering in integrated THz filters.

Applied Physics LettersVol. 129(5)
Hefei University (CN), Institute of Electronics (CN), Purple Mountain Laboratories (CN)
National Natural Science Foundation of China, Priority Academic Program Development of Jiangsu Higher Education Institutions, Jiangsu Provincial Key Laboratory of Advanced Manipulating Technique of Electromagnetic Wave, Excellent Youth Foundation of Jiangsu Scientific Committee
Industry, innovation and infrastructure
Openalex Percentile: Top 16%
Terahertz technology and applications
DOISourceOpenAlex
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