Optomechanics of levitated dielectric particles

Zhang Qi Yin, Andrew A. Geraci, Tongcang Li

Research output: Contribution to journalReview articlepeer-review

128 Scopus citations


We review recent works on optomechanics of optically trapped microspheres and nanoparticles in vacuum, which provide an ideal system for studying macroscopic quantum mechanics and ultrasensitive force detection. An optically trapped particle in vacuum has an ultrahigh mechanical quality factor as it is well-isolated from the thermal environment. Its oscillation frequency can be tuned in real time by changing the power of the trapping laser. Furthermore, an optically trapped particle in vacuum may rotate freely, a unique property that does not exist in clamped mechanical oscillators. In this review, we will introduce the current status of optical trapping of dielectric particles in air and vacuum, Brownian motion of an optically trapped particle at room temperature, Feedback cooling and cavity cooling of the Brownian motion. We will also discuss about using optically trapped dielectric particles for studying macroscopic quantum mechanics and ultrasensitive force detection. Applications range from creating macroscopic Schrödinger's cat state, testing objective collapse models of quantum wavefunctions, measuring Casimir force, searching short-range non-Newtonian gravity, to detect gravitational waves.

Original languageEnglish (US)
Article number1330018
JournalInternational Journal of Modern Physics B
Issue number26
StatePublished - Oct 20 2013


  • Brownian motion
  • Optomechanics
  • macroscopic quantum mechanics
  • optical trapping
  • sensor

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics


Dive into the research topics of 'Optomechanics of levitated dielectric particles'. Together they form a unique fingerprint.

Cite this