Compact TE-pass polarizer based on lithium-niobate-on-insulator assisted by indium tin oxide and silicon nitride

doi:10.1088/1674-1056/ac960b

中国物理B ›› 2023, Vol. 32 ›› Issue (6): 64208-064208.doi: 10.1088/1674-1056/ac960b

Compact TE-pass polarizer based on lithium-niobate-on-insulator assisted by indium tin oxide and silicon nitride

Jia-Min Liu(刘家敏) and De-Long Zhang(张德龙)^†

Department of Opto-electronics and Information Engineering, School of Precision Instruments and Opto-electronics Engineering, Key Laboratory of Optoelectronic Information Technology(Ministry of Education), and Key Laboratory of Micro-Opto-Electro-Mechanical Systems(MOEMS) Technology(Ministry of Education), Tianjin University, Tianjin 300072, China

收稿日期:2022-04-25 修回日期:2022-09-25 接受日期:2022-09-29 出版日期:2023-05-17 发布日期:2023-05-22
通讯作者: De-Long Zhang E-mail:dlzhang@tju.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 61875148).

Compact TE-pass polarizer based on lithium-niobate-on-insulator assisted by indium tin oxide and silicon nitride

Jia-Min Liu(刘家敏) and De-Long Zhang(张德龙)^†

Department of Opto-electronics and Information Engineering, School of Precision Instruments and Opto-electronics Engineering, Key Laboratory of Optoelectronic Information Technology(Ministry of Education), and Key Laboratory of Micro-Opto-Electro-Mechanical Systems(MOEMS) Technology(Ministry of Education), Tianjin University, Tianjin 300072, China

Received:2022-04-25 Revised:2022-09-25 Accepted:2022-09-29 Online:2023-05-17 Published:2023-05-22
Contact: De-Long Zhang E-mail:dlzhang@tju.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 61875148).

摘要/Abstract

摘要： An indium tin oxide (ITO) and silicon nitride (Si₃N₄) assisted compact TE-pass waveguide polarizer based on lithium-niobate-on-insulator is proposed and numerically analyzed. By properly designing the ITO and Si₃N₄ assisted structure and utilizing the epsilon-near-zero effect of ITO, the TM mode is strongly confined in the ITO layer with extremely high loss, while the TE mode is hardly affected and passes through the waveguide with low loss. The simulation results show that the polarizer has an extinction ratio of 22.5 dB and an insertion loss of 0.8 dB at the wavelength of 1.55 μm, and has an operating bandwidth of about 125 nm (from 1540 nm to 1665 nm) for an extinction ratio of >20 dB and an insertion loss of <0.95 dB. Moreover, the proposed device exhibits large fabrication tolerances. More notably, the device is compact, with a length of only 7.5 μm, and is appropriate for on-chip applications.

关键词: polarizer, lithium-niobate-on-insulator, integrated optics devices, optical waveguide

Abstract: An indium tin oxide (ITO) and silicon nitride (Si₃N₄) assisted compact TE-pass waveguide polarizer based on lithium-niobate-on-insulator is proposed and numerically analyzed. By properly designing the ITO and Si₃N₄ assisted structure and utilizing the epsilon-near-zero effect of ITO, the TM mode is strongly confined in the ITO layer with extremely high loss, while the TE mode is hardly affected and passes through the waveguide with low loss. The simulation results show that the polarizer has an extinction ratio of 22.5 dB and an insertion loss of 0.8 dB at the wavelength of 1.55 μm, and has an operating bandwidth of about 125 nm (from 1540 nm to 1665 nm) for an extinction ratio of >20 dB and an insertion loss of <0.95 dB. Moreover, the proposed device exhibits large fabrication tolerances. More notably, the device is compact, with a length of only 7.5 μm, and is appropriate for on-chip applications.

Key words: polarizer, lithium-niobate-on-insulator, integrated optics devices, optical waveguide

中图分类号: (Integrated optics)

42.82.-m

42.79.Ci (Filters, zone plates, and polarizers) 42.25.Ja (Polarization) 42.82.Et (Waveguides, couplers, and arrays)

Jia-Min Liu(刘家敏) and De-Long Zhang(张德龙). Compact TE-pass polarizer based on lithium-niobate-on-insulator assisted by indium tin oxide and silicon nitride[J]. 中国物理B, 2023, 32(6): 64208-064208.

Jia-Min Liu(刘家敏) and De-Long Zhang(张德龙). Compact TE-pass polarizer based on lithium-niobate-on-insulator assisted by indium tin oxide and silicon nitride[J]. Chin. Phys. B, 2023, 32(6): 64208-064208.

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Compact TE-pass polarizer based on lithium-niobate-on-insulator assisted by indium tin oxide and silicon nitride

Compact TE-pass polarizer based on lithium-niobate-on-insulator assisted by indium tin oxide and silicon nitride

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