skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Anomalous oscillations in the spectra of light backscattered by inhomogeneous microparticles

Abstract

We report anomalous oscillatory features in the spectra of cross-polarized backscattered light from inhomogeneous dielectric microparticles. Numerical experiments based on the finite-difference-time-domain method demonstrate that cross-polarized backscattered spectra exhibit oscillation frequencies with two a priori surprising features. First, the oscillation frequencies decrease as the correlation length (L{sub c}) of the particle's refractive index increases. Second, high-frequency oscillations exist even for L{sub c} much smaller than the optical wavelength. These findings are exactly opposite to what is observed in co-polarized backscattering spectra, and are not expected from conventional optical scattering theory. We explain this anomalous behavior by examining the path-length distributions of the backscattered photons in the cross polarization.

Authors:
 [1];  [2];  [3];  [1]
  1. Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208 (United States)
  2. (United States)
  3. Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208 (United States)
Publication Date:
OSTI Identifier:
21072409
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevE.75.037601; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BACKSCATTERING; CORRELATIONS; DIELECTRIC MATERIALS; DISTRIBUTION; LIGHT SCATTERING; OSCILLATIONS; PARTICLES; PHOTONS; POLARIZATION; REFRACTIVE INDEX; VISIBLE RADIATION; WAVELENGTHS

Citation Formats

Li, Xu, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208, Taflove, Allen, and Backman, Vadim. Anomalous oscillations in the spectra of light backscattered by inhomogeneous microparticles. United States: N. p., 2007. Web. doi:10.1103/PHYSREVE.75.037601.
Li, Xu, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208, Taflove, Allen, & Backman, Vadim. Anomalous oscillations in the spectra of light backscattered by inhomogeneous microparticles. United States. doi:10.1103/PHYSREVE.75.037601.
Li, Xu, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208, Taflove, Allen, and Backman, Vadim. Thu . "Anomalous oscillations in the spectra of light backscattered by inhomogeneous microparticles". United States. doi:10.1103/PHYSREVE.75.037601.
@article{osti_21072409,
title = {Anomalous oscillations in the spectra of light backscattered by inhomogeneous microparticles},
author = {Li, Xu and Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208 and Taflove, Allen and Backman, Vadim},
abstractNote = {We report anomalous oscillatory features in the spectra of cross-polarized backscattered light from inhomogeneous dielectric microparticles. Numerical experiments based on the finite-difference-time-domain method demonstrate that cross-polarized backscattered spectra exhibit oscillation frequencies with two a priori surprising features. First, the oscillation frequencies decrease as the correlation length (L{sub c}) of the particle's refractive index increases. Second, high-frequency oscillations exist even for L{sub c} much smaller than the optical wavelength. These findings are exactly opposite to what is observed in co-polarized backscattering spectra, and are not expected from conventional optical scattering theory. We explain this anomalous behavior by examining the path-length distributions of the backscattered photons in the cross polarization.},
doi = {10.1103/PHYSREVE.75.037601},
journal = {Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics},
number = 3,
volume = 75,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}