基于相变材料和铌酸锂薄膜的可重构多功能起偏器  

Reconfigurable and Multifunctional Polarizer Based on Lithium-Niobate-On-Insulator Platform Assisted by Phase-Change Material

作　　者：许孟翔 倪屹[1] 徐银 费耶灯 夏骏 Xu Mengxiang;Ni Yi;Xu Yin;Fei Yedeng;Xia Jun(School of Internet of Things Engineering,Jiangnan University,Wuxi 214122,Jiangsu,China;School of Optoelectronic Science and Engineering&Suzhou Nanotechnology Collaborative Innovation Center,Soochow University,Suzhou 215006,Jiangsu,China;Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of China,Soochow University,Suzhou 215006,Jiangsu,China)

机构地区：[1]江南大学物联网工程学院,江苏无锡214122 [2]苏州大学光电科学与工程学院&苏州纳米科技协同创新中心,江苏苏州215006 [3]江苏省先进光学制造技术重点实验室&苏州大学教育部现代光学技术重点实验室,江苏苏州215006

出　　处：《光学学报》2024年第13期145-152,共8页Acta Optica Sinica

基　　金：江苏省研究生实践创新计划(SJCX23_1223)。

摘　　要：针对集成光学系统对可重构和多功能偏振器件的需求日趋增加的问题,本文提出了一种基于相变材料(PCM)和铌酸锂薄膜(LNOI)的可重构多功能起偏器。通过控制相变材料的相态,可以控制TE和TM模式的通断,从而实现四种输出模式。利用三维时域有限差分(3D-FDTD)法对器件进行参数优化和性能分析。结果表明,该器件可以很好地实现四种输出模式,即TE通、TM通、TE+TM通和无输出。器件长度为69μm、波长为1550 nm时,TE模式的消光比(PER)为34.2 dB,插入损耗(IL)为0.27 dB;TM模式的PER为34.3 dB,IL为0.42 dB。此外,1530~1580 nm的波长范围内该器件具有28 dB以上的PER。还研究分析了器件的工艺容差,结果表明设计具有一定的鲁棒性。这种具有可重构和多功能的高性能起偏器在LNOI平台集成光学系统中具有广泛的应用潜力。Objective Silicon-on-insulator(SOI), as a mature on-chip platform, has been widely implemented in photonic integrated circuits(PICs) due to its large relative refractive index difference(2.0) and compatibility with CMOS processes. However,it has noticeable drawbacks. Generating a light source is challenging, and its linear photoelectric effect is absent, making direct modulation of the light field difficult due to the centrosymmetric crystal structure of silicon. In contrast, thin film lithium niobate-on-insulator(TFLN) emerges as an ideal optical platform candidate. It possesses various excellent properties, such as large electro-optic, thermo-optic, and acoustic-optic coefficients, as well as nonlinear properties, and stable chemical and physical characteristics inherent to its material properties. Moreover, it offers a wide transparent window(from 400 nm to 5 μm) and relatively high refractive index contrast(0.7) for light field confinement. The TFLN can be obtained from the lithium-niobate-on-insulator(LNOI) wafer utilizing the smart cut fabrication process, readily available from commercial companies. By combining the unique properties of TFLN with the LNOI wafer, numerous highspeed modulation devices have been proposed, positioning TFLN as a promising alternative to SOI in both classical and quantum domains. However, lithium niobate is an anisotropic crystal, and its intrinsic birefringence leads to strong polarization dependence. In practical systems, the purity of polarization significantly affects device performance.Therefore, polarization management devices play a crucial role in this optical integrated platform. Polarizers act as filters,efficiently removing interference modes while preserving the target mode, typically within a single waveguide. Owing to the increasing demand for reconfigurable and multifunctional polarization devices for photonic integrated circuits, we implement a reconfigurable and multifunctional polarizer based on an LNOI platform assisted by phase-change material.Methods The st

关 键 词：集成光学 相变材料 铌酸锂 起偏器 

分 类 号：O436[机械工程—光学工程]