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Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces
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Evanescent-Wave Cavity Ring-Down Ellipsometry.

Michael A Everest1,2, Vassilis M Papadakis1, Katerina Stamataki1

  • 1†Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 71110 Heraklion-Crete, Greece.

The Journal of Physical Chemistry Letters
|August 22, 2015
PubMed
Summary
This summary is machine-generated.

We developed evanescent-wave cavity ring-down ellipsometry (EW-CRDE) for precise interface measurements. This new technique can monitor thin films and monolayers on microsecond timescales.

Keywords:
adsorptioncavity ring-downellipsometryevanescent wavethin films

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Area of Science:

  • Surface science
  • Optical physics
  • Analytical chemistry

Background:

  • Characterizing interfaces is crucial for understanding material properties.
  • Existing methods for interface analysis have limitations in sensitivity and time resolution.
  • Precise measurement of optical properties at interfaces is challenging.

Purpose of the Study:

  • Introduce a novel technique, evanescent-wave cavity ring-down ellipsometry (EW-CRDE).
  • Demonstrate EW-CRDE's capability for high-precision ellipsometric measurements at interfaces.
  • Assess the potential for time-resolved monitoring of interfacial phenomena.

Main Methods:

  • Utilized evanescent-wave cavity ring-down ellipsometry (EW-CRDE).
  • Performed measurements at solid-gas and solid-liquid interfaces.
  • Measured time-dependent refractive indices of methanol-water mixtures and thin films.

Main Results:

  • Achieved phase-shift measurements with a precision of approximately 0.01°.
  • Successfully measured the time-dependent refractive index at the liquid/fused-silica interface.
  • Demonstrated the capability to monitor interfacial changes.

Conclusions:

  • EW-CRDE is a powerful new technique for interface analysis.
  • The method offers high precision in ellipsometric measurements.
  • EW-CRDE enables monitoring of monolayers on microsecond timescales, opening new research avenues.