Spectral and directional control of thermal emission is critically important for applications such as space cooling and energy harvesting. The effect of magnetic polaritons (MPs) on spectral modulation has been analyzed in metallic grating structures with a dielectric spacer on a metallic film. It has been predicted that the spectral emission peaks exhibit omnidirectional characteristics when MPs are excited. The present work provides an experimental demonstration of coherent thermal emission from several microfabricated grating structures in the infrared region from room temperature to elevated temperatures. The emittance at elevated temperatures is directly measured using an emissometer, while the room-temperature emittance is indirectly obtained from the reflectance measurement. The rigorous coupled-wave analysis and an LC-circuit model are employed to elucidate the mechanisms of various resonant modes and their coupling effect, taking into consideration the temperature-dependent electron scattering rate of the metals.
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September 2013
This article was originally published in
Journal of Heat Transfer
Research-Article
Measurement of Coherent Thermal Emission Due to Magnetic Polaritons in Subwavelength Microstructures
Z. M. Zhang
Z. M. Zhang
1
Fellow ASME
e-mail: zhuomin.zhang@me.gatech.edu
George W. Woodruff School of Mechanical Engineering,
e-mail: zhuomin.zhang@me.gatech.edu
George W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
,Atlanta, GA 30332
1Corresponding author.
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Z. M. Zhang
Fellow ASME
e-mail: zhuomin.zhang@me.gatech.edu
George W. Woodruff School of Mechanical Engineering,
e-mail: zhuomin.zhang@me.gatech.edu
George W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
,Atlanta, GA 30332
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received July 9, 2012; final manuscript received January 16, 2013; published online July 26, 2013. Assoc. Editor: Pamela M. Norris.
J. Heat Transfer. Sep 2013, 135(9): 091505 (9 pages)
Published Online: July 26, 2013
Article history
Received:
July 9, 2012
Revision Received:
January 16, 2013
Citation
Wang, L. P., and Zhang, Z. M. (July 26, 2013). "Measurement of Coherent Thermal Emission Due to Magnetic Polaritons in Subwavelength Microstructures." ASME. J. Heat Transfer. September 2013; 135(9): 091505. https://doi.org/10.1115/1.4024469
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