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arXiv · 1810.09241

The Measurement of Near-Field Thermal Emission Spectra using an Infrared Waveguide

Saman Zare·Carl Tripp·Sheila Edalatpour
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Abstract

We describe a simple and robust method using an internal reflection element acting as an infrared waveguide to measure the spectra of near-field thermal emission. We experimentally demonstrate the spectrally-narrow peaks of near-field thermal emission by isotropic media due to the excitation of surface phonon-polaritons in quartz and amorphous silica and due to the frustrated total-internal-reflection modes in amorphous silica and polytetrafluoroethylene. Additionally, we demonstrate the broadband near-field thermal emission of hyperbolic modes in hexagonal boron nitride which is an anisotropic uniaxial medium. We also present a theoretical approach based on the fluctuational electrodynamics and dyadic Green's functions for one-dimensional layered media for accurate modeling of the measured spectra.

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Saman Zare, Carl Tripp, Sheila Edalatpour. 2019-06-21. The Measurement of Near-Field Thermal Emission Spectra using an Infrared Waveguide. https://doi.org/10.1103/physrevb.100.235450

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