Potential measurement of evanescent-field-induced radiation pressure

Keiji Sasaki*, Ken ichiro Wada, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review


The direct observation of 3D interaction potential between a single particle and the localized optical field is discussed. A microparticle was irradiated with the evanescent field of a Nd:YAG laser and the focused beam from the laser which positioned the particle. For position detection, a He-Ne laser was used, illuminating the particle under the total-internal-reflection condition. Temporal fluctuation of the particle position due to thermal Brownian motion was sequentially measured to obtain a histogram. The spatial distribution was analyzed with the Boltzmann expression so that a potential energy was determined as a function of the 3D position. The exponential dependence of the radiation pressure on the separation distance was observed.

Original languageEnglish
Number of pages1
StatePublished - 1998
EventProceedings of the 1998 International Quantum Electronics Conference - San Francisco, CA, USA
Duration: 3 May 19988 May 1998


ConferenceProceedings of the 1998 International Quantum Electronics Conference
CitySan Francisco, CA, USA


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