Robust determination of the anisotropic polarizability of nanoparticles using coherent confocal microscopy

Brynmor J. Davis, P. Scott Carney

Research output: Contribution to journalArticlepeer-review

Abstract

A coherent confocal microscope is proposed as a means to fully characterize the elastic scattering properties of a nanoparticle as a function of wavelength. Using a high numerical aperture lens, two-dimensional scanning, and a simple vector-beam shaper, the rank-2 polarizability tensor is estimated from a single confocal image. A method for computationally efficient data processing is described, and numerical simulations show that this algorithm is robust to noise and uncertainty in the focal plane position. The proposed method is a generalization of techniques that provide an estimate of a limited set of scattering parameters, such as a single orientation angle for rodlike particles. The measurement of the polarizability obviates the need for a priori assumptions about the nanoparticle.

Original languageEnglish (US)
Pages (from-to)2102-2113
Number of pages12
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume25
Issue number8
DOIs
StatePublished - Aug 2008
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition

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