基于x切薄膜铌酸锂平台的TM模弯曲波导(特邀)
TM Mode Bending Waveguide Based on x-Cut Thin-Film Lithium Niobate(Invited)
高天 1甘然丰 2陈斌 3余嘉扬 1刘洁 4郭昌建 1陈楷旋 1刘柳3
作者信息
- 1. 华南师范大学华南先进光电子研究院,广东 广州 510631
- 2. 华南师范大学华南先进光电子研究院,广东 广州 510631;中山大学电子与信息工程学院,广东 广州 510275
- 3. 浙江大学光电科学与工程学院,浙江 杭州 310058
- 4. 中山大学电子与信息工程学院,广东 广州 510275
- 折叠
摘要
由于x切薄膜铌酸锂光集成平台的各向异性,光波导TM模在弯曲过程中容易发生模式杂化并耦合到其他模式,对TM模的弯曲构成了挑战.以400 nm厚、半刻蚀的铌酸锂波导为例,分析了TM0模在不同波导宽度和传输方向下的模式杂化现象,并对其90°弯曲传输性能进行仿真.最终得出结论:在特定波导宽度区域(约1.7～2.15 μm),TM0模在90°弯曲过程中不会与其他模式发生杂化;当波导宽度小于1.7 μm(或大于2.15 μm)时,TM0模会与TE1(或TE2)模发生耦合.该结论在实验中也得到了验证.本研究为薄膜铌酸锂波导TM模的弯曲提供了设计思路,可用于该平台偏振调控相关的光集成器件.
Abstract
Due to the anisotropy of the x-cut thin-film lithium niobate optical integration platform,the transverse magnetic(TM)mode of the optical waveguide is prone to mode hybridization and coupling to other modes during bending,posing a challenge to the bending of the TM mode.This article takes a 400 nm thick,semi-etched lithium niobate waveguide as an example to analyze the mode hybridization phenomenon of TM0 mode under different waveguide widths and transmission directions,and simulates its 90° bending transmission performance.The findings indicate that within a certain waveguide width range(approximately 1.7 μm to 2.15 μm),no mode hybridization occurs when bending the TM0 mode.However,for waveguide width lower than 1.7 μm or higher than 2.15 μm,coupling between the TM0 and TE1(or TE2)mode occurs.Experimental demonstrations further corroborate this conclusion.This study offers a design methodology for achieving TM mode bending in thin-film lithium niobate waveguides,with potential applications in polarization-control-related optical integrated devices on this platform.
关键词
集成光学/薄膜铌酸锂/弯曲波导/模式杂化Key words
integrated optics/thin-film lithium niobate/bending waveguide/mode hybridization引用本文复制引用
基金项目
国家自然科学基金(62135012)
国家自然科学基金(62105107)
浙江省创新创业领军人才引进项目(2021R01001)
出版年
2024
NETL
NSTL
万方数据