Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators  

作　　者：Hwaseob Lee Lory Chang Ali Kecebas Dun Mao Yahui Xiao Tiantian Li Andrea Alu Sahin K Ozdemir Tingyi Guo 

机构地区：[1]Department of Electrical and Computer Engineering,University of Delaware,Newark,Delaware 19716,USA [2]Department of Engineering Science and Mechanics,Pennsylvania State University,University Park,PA 16802,USA [3]photonics Initiative,Advanced Science Research Center,City University of NewYork,New York,NY 10031,USA [4]physics Program,Graduate Center,City University of New York,New York,NY 10016,USA [5]Department of Electrical and Computer Engineering,Saint Louis University,Saint Louis,MO 63103,USA

出　　处：《Light(Science & Applications)》2025年第2期401-410,共10页光(科学与应用)(英文版)

基　　金：supported by the Defense Advanced Research Projects Agency(N660012114034);H.L.acknowledges the scholarship provided by the Republic of Korea Navy(ROK Nawy);The design and fabrication of the micro-heater and chiral MRR are supported by AFOSR(FA9550-18-1-0300);S.K.O.acknowledges the Air Force Offce of Scientific Research(AFOSR)Multi-University Research Initiative(FA9550-21-1-0202)and AFOSR(FA9550-18-1-0235)。

摘　　要：Exceptional points(EPs)have been extensively explored in mechanical,acoustic,plasmonic,and photonic systems.However,little is known about the role of EPs in tailoring the dynamic tunability of optical devices.A specific type of EPs known as chiral EPs has recently attracted much attention for controlling the flow of light and for building sensors with better responsivity.A recently demonstrated route to chiral EPs via lithographically defined symmetric Mie scatterers on the rim of resonators has not only provided the much-needed mechanical stability for studying chiral EPs,but also helped reduce losses originating from nanofabrication imperfections,facilitating the in-situ study of chiral EPs and their contribution to the dynamics and tunability of resonators.Here,we use asymmetric Mie scatterers to break the rotational symmetry of a microresonator,to demonstrate deterministic thermal tuning across a chiral EP,and to demonstrate EP-mediated chiral optical nonlinear response and efficient electro-optic tuning.Our results indicate asymmetric electro-optic modulation with up to 17 dB contrast at GHz and CMOS-compatible voltage levels.Such wafer-scale nano-manufacturing of chiral electro-optic modulators and the chiral EP-tailored tunning may facilitate new micro-resonator functionalities in quantum information processing,electromagnetic wave control,and optical interconnects.

关 键 词：lithographically defined symmetric mie scatterers micro resonators chiral exceptional points active tuning NONRECIPROCITY controlling flow light exceptional points eps 

分 类 号：O436[机械工程—光学工程]