Electromagnetic energy storage and power dissipation in nanostructures

TL;DR

This paper investigates how electromagnetic energy is stored and dissipated in nanostructures, revealing that resonance effects enhance both energy storage and absorption, with implications for photovoltaics and heat transfer.

Contribution

It provides a detailed analysis of local energy density and power dissipation in nanogratings using rigorous coupled-wave analysis, linking geometry-induced resonance to energy storage.

Findings

Resonance enhances electromagnetic energy storage in nanostructures.

Strong local electric fields correlate with maximum energy storage.

Analysis aids understanding of energy processes in photovoltaic and heat transfer applications.

Abstract

The processes of storage and dissipation of electromagnetic energy in nanostructures depend on both the material properties and the geometry. In this paper, the distributions of local energy density and power dissipation in nanogratings are investigated using the rigorous coupled-wave analysis. It is demonstrated that the enhancement of absorption is accompanied by the enhancement of energy storage both for material at the resonance of its dielectric function described by the classical Lorentz oscillator and for nanostructures at the resonance induced by its geometric arrangement. The appearance of strong local electric field in nanogratings at the geometry-induced resonance is directly related to the maximum electric energy storage. Analysis of the local energy storage and dissipation can also help gain a better understanding of the global energy storage and dissipation in nanostructures for photovoltaic and heat transfer applications.