High quality factor unidirectional guided resonances of a silicon-on-lithium niobate photonic crystal slab for a tunable Gires&#x2013;Tournois interferometer

Wei Xu; Wei Xu; Qilin Hong; Ping Liu; Ping Liu; Jialong Peng; Jialong Peng; Biao Yang; Biao Yang; Jianfa Zhang; Jianfa Zhang; Zhihong Zhu; Zhihong Zhu

doi:10.1364/OL.498936

Optics Letters
Vol. 48,
Issue 18,
pp. 4761-4764
(2023)
•https://doi.org/10.1364/OL.498936

High quality factor unidirectional guided resonances of a silicon-on-lithium niobate photonic crystal slab for a tunable Gires–Tournois interferometer

Wei Xu, Qilin Hong, Ping Liu, Jialong Peng, Biao Yang, Jianfa Zhang, and Zhihong Zhu

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Wei Xu, Qilin Hong, Ping Liu, Jialong Peng, Biao Yang, Jianfa Zhang, and Zhihong Zhu, "High quality factor unidirectional guided resonances of a silicon-on-lithium niobate photonic crystal slab for a tunable Gires–Tournois interferometer," Opt. Lett. 48, 4761-4764 (2023)

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Abstract

High quality (Q) factor, tunable unidirectional guided resonances (UGRs) based on a silicon-on-lithium niobate (Si-on-LN) photonic crystal (PhC) slab are proposed and numerically investigated. The Q factors of UGRs decay quadratically with respect to the distance from the Γ point to the wave vector along the Γ-X direction, and high Q factor UGRs are obtained by moving UGR close to the Γ point. Also, a Gires–Tournois interferometer (GTI) based on a UGR with a Q factor of 9465 is numerically demonstrated, which produces a maximum group delay of 30 ps around 1.55 μm with unitary reflectance. The group delay and operation wavelengths of the GTI can be adjusted effectively by tuning the refractive index of lithium niobate (LN) and the periods of the silicon bars. Our study may find applications in PhC surface-emitting lasers, dispersion compensation, and compression of light pulses.

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Supplementary Material (1)

Name	Description
Supplement 1	Far-field polarization states and Q factor

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Data underlying the results presented in this Letter are not publicly available at this time but may be obtained from the authors upon reasonable request.

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