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Materials 2017, 10(8), 885; doi:10.3390/ma10080885

Mie-Metamaterials-Based Thermal Emitter for Near-Field Thermophotovoltaic Systems

1
Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, Kingston, RI 02881, USA
2
College of Life Sciences, Northwest University, Xi’an 710069, China
3
National Engineering Research Center for Miniaturized Detection Systems, Northwest University, Xi’an 710069, China
*
Author to whom correspondence should be addressed.
Received: 28 June 2017 / Revised: 26 July 2017 / Accepted: 29 July 2017 / Published: 31 July 2017
(This article belongs to the Special Issue Advance in Plasmonics and Metamaterials)
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Abstract

In this work, we theoretically analyze the performance characteristics of a near-field thermophotovoltaic system consisting a Mie-metamaterial emitter and GaSb-based photovoltaic cell at separations less than the thermal wavelength. The emitter consists of a tungsten nanoparticle-embedded thin film of SiO 2 deposited on bulk tungsten. Numerical results presented here are obtained using formulae derived from dyadic Green’s function formalism and Maxwell–Garnett-Mie theory. We show that via the inclusion of tungsten nanoparticles, the thin layer of SiO 2 acts like an effective medium that enhances selective radiative heat transfer for the photons above the band gap of GaSb. We analyze thermophotovoltaic (TPV) performance for various volume fractions of tungsten nanoparticles and thicknesses of SiO 2 . View Full-Text
Keywords: near-field thermal radiation; thermophotovoltaics; Mie-metamaterials; effective medium theory near-field thermal radiation; thermophotovoltaics; Mie-metamaterials; effective medium theory
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Ghanekar, A.; Tian, Y.; Zhang, S.; Cui, Y.; Zheng, Y. Mie-Metamaterials-Based Thermal Emitter for Near-Field Thermophotovoltaic Systems. Materials 2017, 10, 885.

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