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arXiv · 1509.00939

Quasi-Normal Mode Theory for Thermal Radiation from Lossy and Dispersive Optical Resonators

Baoan Liu·Jiayu Li·Sheng Shen
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Abstract

Although optical resonators are widely used for controlling and engineering thermal radiation, what has been lacking is a general theoretical framework to elucidate the thermal emission of optical resonators, and guide the design and application of thermally driven optical resonators. We developed a general and self-consistent formalism to describe the thermal radiation from arbitrary optical resonators made by lossy and dispersive materials like metals, with the only assumption that the resonators have a single predominant resonance mode. Our formalism demonstrates that the thermal emission of an optical resonator is maximized when the mode losses to the emitter and the absorber (or far-field background) are matched, and meanwhile the predominant resonant modes are electrically quasi-static. By efficiently calculating the resonant modes using the finite element methods, our formalism serves as a general principle of designing the arbitrary optical resonator thermal emitters with perfect or maximized emission.

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Baoan Liu, Jiayu Li, Sheng Shen. 2015-09-03. Quasi-Normal Mode Theory for Thermal Radiation from Lossy and Dispersive Optical Resonators. https://arxiv.org/abs/1509.00939

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