Inverse-designed broadband low-loss grating coupler on thick lithium-niobate-on-insulator platform
Yijun Xie, Mingming Nie, Shu‐Wei Huang
Abstract
A grating coupler on 700-nm-thick Z-cut lithium-niobate-on-insulator platform with high coupling efficiency, large bandwidth, and high fabrication tolerance is designed and optimized by inverse design method. The optimized grating coupler is fabricated with a single set of e-beam lithography and etching process, and it is experimentally characterized to possess peak coupling efficiency of −3.8 dB at 1574.93 nm, 1 dB bandwidth of 71.7 nm, and 3 dB bandwidth of over 120 nm, respectively.
Topics & Concepts
Lithium niobateMaterials scienceGratingFabricationBroadbandLithographyBandwidth (computing)OptoelectronicsOpticsElectron-beam lithographyCoupling lossPhotolithographyInsulator (electricity)Isotropic etchingEtching (microfabrication)ResistOptical fiberNanotechnologyLayer (electronics)PhysicsAlternative medicineComputer networkPathologyMedicineComputer sciencePhotonic and Optical DevicesPhotorefractive and Nonlinear OpticsAdvanced Fiber Laser Technologies