Optically trapped gold nanoparticle enables listening at the microscale

Alexander Ohlinger, Andras Deak, Andrey A. Lutich, Jochen Feldmann

Research output: Contribution to journalArticle

43 Citations (Scopus)


We explore a new application of optical tweezers for ultrasensitive detection of sound waves in liquid media. Position tracking of a single gold nanoparticle confined in a three-dimensional optical trap is used to readout acoustic vibrations at a sound power level down to -60dB, causing a ∼90μeV increase in kinetic energy of the nanoparticle. The unprecedented sensitivity of such a nanoear is achieved by processing the nanoparticle's motion in the frequency domain. The concept developed here will enable us to access the interior of biological microorganisms and micromechanical machines not accessible by other microscopy types.

Original languageEnglish
Article number018101
JournalPhysical review letters
Issue number1
Publication statusPublished - Jan 3 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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