Broadband picometer-scale resolution on-chip spectrometer with reconfigurable photonics

作     者：Chunhui Yao Minja Chen Ting Yan Liang Ming Qixiang Cheng Richard Penty Chunhui Yao;Minjia Chen;Ting Yan;Liang Ming;Qixiang Cheng;Richard Penty

作者机构：Centre for Photonic SystemsElectrical Engineering DivisionDepartment of EngineeringUniversity of CambridgeCambridge CB3 OFAUK GlitterinTech LimitedXuzhou 221000China 

出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)

年 卷 期：2023年第12卷第7期

页      面：1415-1424页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：supported by UK EPSRC,project QUDOS(EP/TO28475/1) The authors thank CORNERSTONE for providing free access to their first SiN MPW run(funded by the CORNERSTONE 2 project under Grant EP/TO19697/1) 

主　　题：reconfigurable resolution enable 

摘      要：Miniaturization of optical spectrometers is important to enable spectroscopic analysis to play a role in in situ,or even in vitro and in vivo characterization ***,scaled-down spectrometers generally exhibit a strong trade-off between spectral resolution and operating bandwidth,and are often engineered to identify signature spectral peaks only for specific *** this paper,we propose and demonstrate a novel global sampling strategy with distributed filters for generating ultra-broadband pseudo-random spectral *** geometry of all-pass ring filters is tailored to ensure small self-and cross-correlation for effective information acquisition across the whole spectrum,which dramatically reduces the requirement on sampling *** employ the power of reconfigurable photonics in spectrum shaping by embedding the engineered distributed *** a moderate mesh of MZls,we create 256 diverse spectral responses on a single chip and demonstrate a resolution of 20 pm for single spectral lines and 30 pm for dual spectral lines over a broad bandwidth of 115 nm,to the best of our knowledge achieving a new record of bandwidth-to-resolution *** simulations reveal that this design will readily be able to achieve single-picometer-scale *** further show that the reconfigurable photonics provides an extra degree of programmability,enabling user-defined features on resolution,computation complexity,and relative *** use of SiN integration platform enables the spectrometer to exhibit excellent thermal stability of±2.0℃,effectively tackling the challenge of temperature variations at picometer-scale resolutions.