基于铌酸锂薄膜的高耦合效率、大带宽光栅耦合器(特邀)  

High-Efficiency,Large Bandwidth Grating Coupler Based on Lithium Niobate Thin Film(Invited)

作　　者：倪屹[1] 林禹 徐银 费耶灯 Ni Yi;Lin Yu;Xu Yin;Fei Yedeng(School of Internet of Things Engineering,Jiangnan University,Wuxi 214122,Jiangsu,China;Institute of Advanced Technology,Jiangnan University,Wuxi 214122,Jiangsu,China)

机构地区：[1]江南大学物联网工程学院,江苏无锡214122 [2]江南大学先进技术研究院,江苏无锡214122

出　　处：《激光与光电子学进展》2024年第11期97-102,共6页Laser & Optoelectronics Progress

摘　　要：提出了一种基于铌酸锂平台的大带宽二维光栅耦合器,通过引入光电材料制成的铌酸锂晶体作为平台,采用硅三角形结构,以有效介质理论为基础沿着光传播的方向改变每个三角形的横向宽度,并在硅光栅耦合器与底部铌酸锂薄膜(LNTF)波导之间引入了低折射率氧化物缓冲层,在波长1550 nm处获得一个具有60.8%耦合效率以及102 nm的1 dB大带宽的垂直光栅耦合器。This study proposes a large bandwidth two-dimensional grating coupler based on the lithium niobate platform.By introducing a lithium niobate crystal comprising a photoelectric material as the platform,a silicon triangle structure is adopted,and based on the effective medium theory,the transverse width of each triangle is changed along the direction of light propagation.A low refractive index oxide buffer layer is introduced between the silicon grating coupler and the bottom of lithium niobate thin film(LNTF)waveguide.A vertical grating coupler with a coupling efficiency of 60.8% and a 1 dB bandwidth of 102 nm is obtained at a wavelength of 1550 nm.

关 键 词：光电材料 光栅耦合器 铌酸锂晶体 波导 

分 类 号：TN252[电子电信—物理电子学]