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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Published on: July 21, 2018

Doppler spectrum-based polar nephelometer.

Paul L Kebabian1, Timothy B Onasch, Joda C Wormhoudt

  • 1Aerodyne Research, Inc., Billerica, Massachusetts 01821-3976, USA.

Optics Letters
|September 4, 2012
PubMed
Summary
This summary is machine-generated.

This study measures particle scattering asymmetry using Doppler spectra of scattered light. The method accurately determines particle properties without calibration, aligning well with Mie theory predictions.

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Area of Science:

  • * Aerosol science and optical physics.
  • * Particle characterization and light scattering.
  • * Spectroscopic analysis of microparticles.

Background:

  • * Characterizing submicrometer particles is crucial for atmospheric and material sciences.
  • * Traditional methods for determining scattering properties often require calibration.
  • * Understanding light scattering asymmetry is key to predicting particle behavior.

Purpose of the Study:

  • * To develop a calibration-free method for measuring particle scattering asymmetry.
  • * To determine the complete scattering phase function of particle ensembles.
  • * To validate the technique against established theoretical models like Mie theory.

Main Methods:

  • * Utilizing Doppler spectroscopy of scattered light from particles.
  • * Employing a 532 nm laser with long coherence length.
  • * Incorporating an integrating sphere and heterodyne detection scheme.

Main Results:

  • * Successfully determined the particle scattering asymmetry parameter.
  • * Measured scattering phase functions for various particle types.
  • * Results showed agreement within ±0.03 of Mie theory calculations for polystyrene and ammonium sulfate particles.

Conclusions:

  • * The Doppler spectrum method provides accurate, calibration-free measurement of particle scattering asymmetry.
  • * This technique offers a reliable approach for characterizing submicrometer particles.
  • * The findings support the applicability of the method in diverse scientific fields.