Inverse design for material anisotropy and its application for a compact X-cut TFLN on-chip wavelength demultiplexer  

作　　者：Jiangbo Lyu Tao Zhu Yan Zhou Zhenmin Chen Yazhi Pi Zhengtong Liu Xiaochuan Xu Ke Xu Xu Ma Lei Wang Zizheng Cao Shaohua Yu 

机构地区：[1]Peng Cheng Laboratory,Shenzhen 518055,China [2]Department of Electronic and Information Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China [3]Key Laboratory of Photoelectronic Imaging Technology and System of Ministry of Education of China,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Opto-Electronic Science》2023年第11期14-24,共11页光电科学（英文）

基　　金：supported from the Major Key Project of PCL;the National Talent Program。

摘　　要：Inverse design focuses on identifying photonic structures to optimize the performance of photonic devices.Conventional scalar-based inverse design approaches are insufficient to design photonic devices of anisotropic materials such as lithium niobate(LN).To the best of our knowledge,this work proposes for the first time the inverse design method for anisotropic materials to optimize the structure of anisotropic-material based photonics devices.Specifically,the orientation dependent properties of anisotropic materials are included in the adjoint method,which provides a more precise prediction of light propagation within such materials.The proposed method is used to design ultra-compact wavelength division demultiplexers in the X-cut thin-film lithium niobate(TFLN)platform.By benchmarking the device performances of our method with those of classical scalar-based inverse design,we demonstrate that this method properly addresses the critical issue of material anisotropy in the X-cut TFLN platform.This proposed method fills the gap of inverse design of anisotropic materials based photonic devices,which finds prominent applications in TFLN platforms and other anisotropicmaterial based photonic integration platforms.

关 键 词：integrated photonics inverse design for anisotropic materials adjoint method lithium niobate 

分 类 号：TN25[电子电信—物理电子学]