Photonics Research, 2019, 7 (12): 12001440, Published Online: Nov. 19, 2019  

Brillouin cavity optomechanics sensing with enhanced dynamical backaction Download: 577次

Author Affiliations
1 State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
2 Beijing Information Science and Technology National Research Center, Beijing 100084, China
3 Beijing Academy of Quantum Information Sciences, Beijing 100193, China
4 e-mail: dongruan@tsinghua.edu.cn
5 e-mail: gllong@tsinghua.edu.cn
Abstract
Based on the dispersive interaction between a high quality factor microcavity and nano-objects, whispering-gallery-mode microcavities have been widely used in highly sensitive sensing. Here, we propose a novel method to enhance the sensitivity of the optical frequency shift and reduce the impact of the laser frequency noise on the detection resolution through Brillouin cavity optomechanics in a parity-time symmetric system. The optical spring effect is sensitive to the perturbation of optical modes around the exceptional point. By monitoring the shift of the mechanical frequency, the detection sensitivity for the optical frequency shift is enhanced by 2 orders of magnitude compared with conventional approaches. We find the optical spring effect is robust to the laser frequency noise around the exceptional point, which can reduce the detection limitation caused by the laser frequency instability. Thus, our method can improve the sensing ability for nano-object sensing and other techniques based on the frequency shift of the optical mode.

Guo-Qing Qin, Min Wang, Jing-Wei Wen, Dong Ruan, Gui-Lu Long. Brillouin cavity optomechanics sensing with enhanced dynamical backaction[J]. Photonics Research, 2019, 7(12): 12001440.

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