J. Quant. Spectrosc. Radiat. Transfer.2015, 151: 49-57

Electromagneticenergy storage and power dissipation in nanostructures

J. M. Zhao(jmzhao@hit.edu.cn) and Z.M. Zhang*(zhuomin.zhang@me.gatech.edu)

Abstract

The processes of storage and dissipation ofelectromagnetic energy in nanostructures depend on both the material propertiesand the geometry. In this paper, the distributions of local energy density andpower dissipation in nanogratings are investigated using the rigorous coupled-wave analysis. It is demonstrated that the enhancement of absorption is accompanied bythe enhancement of energy storage both for material at the resonance of its dielectricfunction described by the classical Lorentz oscillator and for nanostructures atthe resonance induced by its geometric arrangement. The appearance of stronglocal electric field in nanogratings at the geometry-induced resonance is directlyrelated to the maximum electric energy storage. Analysis of the local energy storageand dissipation can also help gain a better understanding of the global energystorage and dissipation in nanostructures for photovoltaic and heat transfer applications.

Keywords: Energy density; nanostructures; power dissipation

paper link: http://www.sciencedirect.com/science/article/pii/S0022407314003835 

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