Evanescent wave Doppler velocimetry for a wall's near field

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Abstract

This study proposes a Doppler velocimetry utilizing evanescent waves that are induced by a laser beam. This velocimetry allows us to measure the flow velocity within the near field less than 1 μm from a dielectric surface. When evanescent waves propagate in opposite directions on a dielectric surface, the waves interfere with each other and produce a standing wave within the near field. When a tracer particle goes through the standing wave, the particle scatters the wave. The flow velocity within the near field can be determined by measuring the blinking frequency similar to conventional laser Doppler velocimetry. The validity of this velocimetry is empirically examined by applying it to a slip velocity measurement of a solid on a dielectric surface.

Original languageEnglish
Pages (from-to)1805-1806
Number of pages2
JournalApplied Physics Letters
Volume75
Issue number12
DOIs
Publication statusPublished - 1999 Sep 20

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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