Realization of advanced passive silicon photonic devices with subwavelength grating structures developed by efficient inverse design  

作　　者：Jingshu Guo Laiwen Yu Hengtai Xiang Yuqi Zhao Chaoyue Liu Daoxin Dai 

机构地区：[1]Zhejiang University,College of Optical Science and Engineering,International Research Center for Advanced Photonics,State Key Laboratory for Modern Optical Instrumentation,Hangzhou,China [2]Zhejiang University,Jiaxing Research Institute,Intelligent Optics&Photonics Research Center,Jiaxing Key Laboratory of Photonic Sensing&Intelligent Imaging,Jiaxing,China [3]Zhejiang University,Ningbo Research Institute,Ningbo,China

出　　处：《Advanced Photonics Nexus》2023年第2期81-93,共13页先进光子学通讯（英文）

基　　金：supported by the National Major Research and Development Program(Grant No.2018YFB2200200);the National Science Fund for Distinguished Young Scholars(Grant No.61725503);the National Natural Science Foundation of China(Grant Nos.62175216,61961146003,91950205);Zhejiang Provincial Natural Science Foundation(Grant No.LR22F050001);The Fundamental Research Funds for the Central Universities;The Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang(Grant No.2021R01001).

摘　　要：Compact passive silicon photonic devices with high performance are always desired for future largescale photonic integration.Inverse design provides a promising approach to realize new-generation photonic devices,while it is still very challenging to realize complex photonic devices for most inverse designs reported previously due to the limits of computational resources.Here,we present the realization of several representative advanced passive silicon photonic devices with complex optimization,including a sixchannel mode(de)multiplexer,a broadband 90 deg hybrid,and a flat-top wavelength demultiplexer.These devices are designed inversely by optimizing a subwavelength grating(SWG)region and the multimode excitation and the multimode interference are manipulated.Particularly,such SWG structures are more fabrication-friendly than those random nanostructures introduced in previous inverse designs.The realized photonic devices have decent performances in a broad bandwidth with a low excess loss of<1 dB,which is much lower than that of previous inverse-designed devices.The present inverse design strategy shows great effectiveness for designing advanced photonic devices with complex requirements(which is beyond the capability of previous inverse designs)by using affordable computational resources.

关 键 词：silicon photonics inverse design subwavelength grating structures mode(de)multiplexers wavelength(de)multiplexers 90 deg hybrids 

分 类 号：TN2[电子电信—物理电子学]