Electromagnetic energy stored in inhomogeneous scattering systems
| Autor: | Felipe A. Pinheiro, Tiago J. Arruda, Alexandre Martinez |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Internal energy Scattering business.industry Forward scatter FOS: Physical sciences ÓPTICA NÃO LINEAR Atomic packing factor 01 natural sciences Electromagnetic radiation Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials 010309 optics Optics 0103 physical sciences Radiative transfer Computer Vision and Pattern Recognition Scattering theory 010306 general physics business Absorption (electromagnetic radiation) Physics - Optics Optics (physics.optics) |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| DOI: | 10.48550/arxiv.1709.10121 |
| Popis: | We analytically study the time-averaged electromagnetic energy stored inside scatterers containing inclusions of arbitrary shapes. Assuming the low density of inclusions, we derive the expression for the energy-transport velocity through disordered media without relying on the radiative transfer equation. Moreover, this expression is independent of the shape of scatterers. In addition, we obtain a relation between the dwell and absorption times associated with inclusions by considering the relationship between the internal energy and absorption cross-section. An approximation for the electromagnetic energy stored inside a disordered medium in terms of the transport mean free path and the packing fraction is also derived. This expression suggests that the enhanced electromagnetic energy within the host medium is achieved for inclusions exhibiting negative scattering asymmetry parameters. As a result, disordered media with enhanced backscattering is expected to exhibit large quality factors. |
| Databáze: | OpenAIRE |
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