Generalization of electromagnetic scattering by charged grains through incorporation of interband and intraband effects.

Scattering of electromagnetic radiation by electrically charged spherical particles is treated theoretically. A generalization of the approach is performed by incorporating both intraband and interband effects, while a new oscillatory term corresponding to the classical dispersion theory and the semi-quantum approach is considered. It is shown through a set of numerical experiments that interband effects may reduce the amplitude of resonant peaks for scattering, Q(sca), and absorption, Q(abs), and cause a shift of peak positions to longer wavelengths. In general, the resonant features due to interband and intraband effects can occur at different frequencies; thus, both together may result in qualitatively and quantitatively new optical signatures of electrically charged particles. This is a motivating factor for experimentalists who can use the particles as targeted probes, for example, in mapping the electric fields in different media based on scattering and/or absorption properties of electrified particulate systems.

[1]  Li Xingcai,et al.  The electromagnetic scattering of the charged inhomogeneous sand particle , 2013 .

[2]  Xiaojing Zheng,et al.  The comparison between the Mie theory and the Rayleigh approximation to calculate the EM scattering by partially charged sand , 2012 .

[3]  Shaolin Liao,et al.  Millimeter-wave scattering from neutral and charged water droplets , 2010 .

[4]  G. Mie.  Beiträge zur Optik trüber Medien, speziell kolloidaler Metallösungen , 1908 .

[5]  Gorden Videen,et al.  Optical signatures of electrically charged particles: Fundamental problems and solutions , 2015 .

[6]  S. Arnon,et al.  Resonance Frequencies of Electrically Charged Nanoparticles , 2011, IEEE Photonics Journal.

[7]  Miroslav Kocifaj,et al.  Scattering of electromagnetic waves by charged spheres and some physical consequences , 2007 .

[8]  Enhanced absorption of light by charged nanoparticles. , 2010, Optics letters.

[9]  H. Fehske,et al.  Mie scattering by a charged dielectric particle. , 2012, Physical review letters.

[10]  Marc Lamy de la Chapelle,et al.  Improved analytical fit of gold dispersion: Application to the modeling of extinction spectra with a finite-difference time-domain method , 2005 .

[11]  Xiaodong Chen,et al.  Dependence of Plasmonic Properties on Electron Densities for Various Coupled Au Nanostructures , 2014 .

[12]  M. Majewski,et al.  Optical properties of metallic films for vertical-cavity optoelectronic devices. , 1998, Applied optics.

[13]  C. Bohren,et al.  Scattering of electromagnetic waves by a charged sphere , 1977 .

[14]  Gorden Videen,et al.  Effect of charged-particle surface excitations on near-field optics. , 2015, Applied optics.

[15]  H. Fehske,et al.  Optical signatures of the charge of a dielectric particle in a plasma. , 2013, Physical review. E, Statistical, nonlinear, and soft matter physics.

[16]  H. Ehrenreich,et al.  Optical Properties of Aluminum , 1963 .

[17]  P. Mulvaney,et al.  Charge-induced Rayleigh instabilities in small gold rods. , 2007, Nano letters.

[18]  Li Xie,et al.  Attenuation of an electromagnetic wave by charged dust particles in a sandstorm. , 2010, Applied optics.

[19]  Gorden Videen,et al.  Backscatter in a cloudy atmosphere as a lightning-threat indicator , 2015 .

[20]  A. P. Mackenzie,et al.  Similarity of Scattering Rates in Metals Showing T-Linear Resistivity , 2013, Science.

[21]  H. Y. Chung,et al.  Effects of extraneous surface charges on the enhanced Raman scattering from metallic nanoparticles. , 2013, The Journal of chemical physics.