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Precision sensing using high-Q microcavities
Date: 2018-03-27
Time: 09:30
Venue: 中科院物理研究所M楼238会议室
Speaker: Dr. Beibei Li

University of Queensland, Australia

My working interest has been focused on high-Q optical microcavities and their applications in sensing, such as ultrasensitive magnetic field sensing, single nanoparticle detection, and temperature sensing. My talk will be focused on two parts:
1. Single nanoparticle detection using microcavities and nanofibers: We proposed and demonstrated a single nanoparticle detection scheme using split-mode microcavity Raman lasers, and detected 20-nm nanoparticles in an aqueous environment. We also realized single nanoparticles detection using a nanofiber array, in both air and an aqueous environment.
2. Ultrasensitive magnetometry using cavity optomechanics. We achieved ultrasensitive and broadband cavity optomechanical magnetometry, by incorporating a magnetostrictive material with the high Q optical microresonator, with the achieved sensitivity of 26.5 nT/Hz1/2 which is comparable with the same-sized superconducting quantum interference device (SQUID) but without using cryogenic system, and working bandwidth of more than 100 MHz. We also demonstrated quantum light enhanced cavity optomechanical magnetometry by probing the magnetometer system with phase squeezed light. We also developed a scalable and reproducible fabrication pathway for the on-chip cavity optomechanical magnetometry.


邀请人:许秀来 研究员(Tel:82649820)
联系人: 陆 凌 研究员 (Tel:82649203)

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