Precise control of coupling strength in photonic molecules over a wide range using nanoelectromechanical systems.
Photonic molecules have a range of promising applications including quantum information processing, where precise control of coupling strength is critical. Here, by laterally shifting the center-to-center offset of coupled photonic crystal nanobeam cavities, we demonstrate a method to precisely and dynamically control the coupling strength of photonic molecules through integrated nanoelectromechanical systems with a precision of a few GHz over a range of several THz without modifying the nature of their constituent resonators. Furthermore, the coupling strength can be tuned continuously from negative (strong coupling regime) to zero (weak coupling regime) and further to positive (strong coupling regime) and vice versa. Our work opens a door to the optimization of the coupling strength of photonic molecules in situ for the study of cavity quantum electrodynamics and the development of efficient quantum information devices.
Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576.
Han
H
Du
Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576.
Xingwang
X
Zhang
Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576.
Guoqiang
G
Chen
Institute of Materials Research and Engineering, A *STAR (Agency for Science, Technology, and Research), 2 Fusionopolis Way, Innovis, #08-03, Singapore 138634.
Jie
J
Deng
Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576.
Fook Siong
FS
Chau
Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576.
Guangya
G
Zhou