Volume 133, Number 1, January 2021
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||04 March 2021|
Real-time sensing on the angular coordinates of nanoparticles using whispering-gallery mode optical microcavities
1 School of Science and the State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications - Beijing 100876, China
2 School of Electronic Engineering and the State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications - Beijing 100876, China
3 School of Artificial Intelligence, Beijing Normal University - Beijing 100875, China
4 Peking Union Medical College Hospital - Beijing 100730, China
Received: 28 October 2020
Accepted: 2 December 2020
We theoretically study the scattering-particles–induced field distribution in a whispering-gallery mode optical microcavity system. It is shown that the relative phase angle of the scatters can result in an asymmetric optical distribution. Different from the previous sensing scheme using spectrum scanning whose real time information is limited by the scanning frequency, the proposed scheme could realize the real-time sensing for the angular position of nanoparticles with stable frequency tricolor beams. Numerical simulation is performed to show the performance of the system under different coupling and dissipation condition for the nanoparticles. The scheme may have potential applications in the particle sensing and characterization of both the velocity and angular momentum of the nanoparticles.
PACS: 42.50.Md – Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency / 42.50.Pq – Cavity quantum electrodynamics; micromasers
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