A Long-Period Grating Formed by Residual Stress on Thin-Film Lithium Niobate With Efficient Electro-Optic and Thermo-Optic Tuning.

Jiayao Deng, Hao Yao, Yuzhe Sun, Hao Zhang, Yinglu Zhang, Jieyun Wu, Kaixin Chen

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Article in Nanophotonics (Berlin, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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7 authors.

Jiayao DengSchool of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu China.

Hao YaoSchool of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu China.

Yuzhe SunSchool of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu China.

Hao ZhangSchool of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu China.

Yinglu ZhangSchool of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu China.

Jieyun WuSchool of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu China.ORCID https://orcid.org/0000-0002-6135-4545

Kaixin ChenSchool of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu China.

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6 · The paper itself

Abstract

We propose and demonstrate a long-period waveguide grating with tunable resonant wavelength and contrast based on hybrid polymer and thin-film lithium niobate platform. The grating is formed in the polymer cladding through stress-induced refractive index modulation, achieved by a periodic metal structure on the cladding. This metal structure also acts as a heater for thermo-optic (TO) tuning and an electrode for electro-optic (EO) tuning. Thanks to the bidirectional index change provided by the EO effect, the device allows either red or blue shift of the resonant wavelength and control of the resonant contrast. The fabricated device exhibits a resonant contrast of 12.38 (19.65) dB at 1553.43 (1542.68) nm for the

Indexed as

long‐period waveguide gratingreconfigurable photonic devicesstress‐induced refractive index modulationthermo‐optic tuningthin‐film lithium niobate

Identifiers

PMID42845920

DOI10.1002/nap2.70118

PMCPMC13642066

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