Journal ArticleDOI
The discrete-dipole approximation and its application to interstellar graphite grains
TLDR
The discrete dipole approximation (DDA) was extended to incorporate the effects of radiative reaction and to allow for possible anisotropy of the dielectric tensor of the material as mentioned in this paper.Abstract:
The discrete dipole approximation (DDA), a flexible method for computing scattering of radiation by particles of arbitrary shape, is extended to incorporate the effects of radiative reaction and to allow for possible anisotropy of the dielectric tensor of the material. Formulas are given for the evaluation of extinction, absorption, scattering, and polarization cross sections. A simple numerical algorithm based on the method of conjugate gradients is found to provide an efficient and robust method for obtaining accurate solutions to the scattering problem. The method works well for absorptive, as well as dielectric, grain materials. Two validity criteria for the DDA are presented. The DDA is then used to compute extinction cross sections for spherical graphite grains and to calculate extinction cross sections for nonspherical graphite grains with three different geometries. It is concluded that the interstellar 2175 A extinction feature could be produced by small graphite grains which should have aspect ratios not far from unity. 35 references.read more
Citations
More filters
Book
Principles of nano-optics
Lukas Novotny,Bert Hecht +1 more
TL;DR: In this paper, the authors proposed a method for propagating and focusing of optical fields in a nano-optics environment using near-field optical probes and probe-sample distance control.
Journal ArticleDOI
Discrete-Dipole Approximation For Scattering Calculations
Bruce T. Draine,Piotr J. Flatau +1 more
TL;DR: In this article, the authors used the discrete-dipole approximation (DDA) for scattering calculations, including the relationship between the DDA and other methods, including complex-conjugate gradient algorithms and fast-Fourier transform methods.
Book
Theory of Reflectance and Emittance Spectroscopy
TL;DR: In this article, the authors present a review of vector calculus and functions of a complex variable and Fraunhoffer diffraction by a circular hole, and a miscellany of bidirectional reflectances and related quantities.
Journal ArticleDOI
Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications
TL;DR: Of all the possible nanoparticle shapes, gold nanorods are especially intriguing as they offer strong plasmonic fields while exhibiting excellent tunability and biocompatibility, according to a review of their radiative and nonradiative properties.
Journal ArticleDOI
Gold nanoparticles: Optical properties and implementations in cancer diagnosis and photothermal therapy
TL;DR: The surface plasmon resonance of gold nanoparticles leads to strong electromagnetic fields on the particle surface and consequently enhances all the radiative properties such as absorption and scattering as discussed by the authors, and the strongly absorbed light is converted to heat quickly via a series of nonradiative processes.