Abstract

We propose a novel design of photonic-crystal nanobeam cavities in lithium niobate (LN) for both TE and TM modes, addressing problems associated with tilted sidewalls, which commonly result from dry etching. Using optimized periodical nano-groove structures, the proposed devices could achieve quality factors as high as $3.9\times {10}^6$ with a modal volume of 5.0 ${(\lambda /n)}^3$. We also show that such a design is promising for applications in nonlinear optics by theoretically predicting the efficiencies for electro-optic modulation and second-harmonic generation. The proposed nano-groove structures and design rules could also be applied for other material platforms that possess tilted sidewalls.

© 2015 Optical Society of America

Ultra-compact electro-optic modulator based on etchless lithium niobate photonic crystal nanobeam cavity

Jiaxin Zhang, Bincheng Pan, Weixi Liu, Daoxin Dai, and Yaocheng Shi
Opt. Express 30(12) 20839-20846 (2022)

Large quality factor enhancement based on cascaded uniform lithium niobate bichromatic photonic crystal cavities

Rui Ge, Xiongshuo Yan, Zhaokang Liang, Hao Li, Jiangwei Wu, Xiangmin Liu, Yuping Chen, and Xianfeng Chen
Opt. Lett. 48(1) 113-116 (2023)

Topological edge states in equidistant arrays of lithium niobate nano-waveguides

Andrey V. Gorbach, Jesper Beer, and Anton Souslov
Opt. Lett. 48(8) 1982-1985 (2023)

Low-loss waveguides in a single-crystal lithium niobate thin film

Lutong Cai, Yiwen Wang, and Hui Hu
Opt. Lett. 40(13) 3013-3016 (2015)

Design of mechanically-tunable photonic crystal split-beam nanocavity

Tong Lin, Feng Tian, Peng Shi, Fook Siong Chau, Guangya Zhou, Xiaosong Tang, and Jie Deng
Opt. Lett. 40(15) 3504-3507 (2015)