Waveguide superlattices with artificial gauge field toward colorless and low-crosstalk ultrahigh-density photonic integration  

作　　者：Xuelin Zhang Jiangbing Du Ke Xu Zuyuan He 

机构地区：[1]Shanghai Jiao Tong University,State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai,China [2]Harbin Institute of Technology(Shenzhen),Department of Electronic and Information Engineering,Shenzhen,China

出　　处：《Advanced Photonics》2025年第1期14-22,共9页先进光子学(英文)

基　　金：supported by the National Key Research and Development Program of China(Grant No.2023YFB2905502);the National Natural Science Foundation of China(Grant Nos.62122047 and 61935011)。

摘　　要：Dense waveguides are the basic building blocks for photonic integrated circuits(PICs).Due to the rapidly increasing scale of PIC chips,high-density integration of waveguide arrays working with low crosstalk over broadband wavelength range is highly desired.However,the subwavelength regime of such structures has not been adequately explored in practice.We propose a waveguide superlattice design leveraging the artificial gauge field mechanism,corresponding to the quantum analog of field-induced n-"photon"resonances in semiconductor superlattices.This approach experimentally achieves-24 dB crosstalk suppression with an ultrabroad transmission bandwidth more than 500 nm for dual polarizations on the Si_3N_4 platform.The fabricated waveguide superlattices support high-speed signal transmission of 112 Gbit/s with high-fidelity signal-to-noise ratio profiles and bit error rates.This design,featuring a silica upper cladding,is compatible with standard metal back-end-of-the-line processes.Based on such a fundamental structure,which is readily transferable to other platforms,passive and active devices over versatile platforms can be realized with a significantly shrunk on-chip footprint,thus it holds great promise for significant reduction of the power consumption and cost in PICs.

关 键 词：silicon nitride waveguides waveguide superlattice artificial gauge field 

分 类 号：TN256[电子电信—物理电子学]