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Jun, Young Chul
Laboratory of Nanophotonics & Metamaterials (NanoMeta)
Research Interests
  • Nanophotonics, plasmonics, metamaterials, 4D printing, programmable matter, smart materials

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Doping-tunable thermal emission from plasmon polaritons in semiconductor epsilon-near-zero thin films

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Title
Doping-tunable thermal emission from plasmon polaritons in semiconductor epsilon-near-zero thin films
Author
Jun, Young ChulLuk, Ting S.Ellis, A. RobertKlem, John F.Brener, Igal
Keywords
PHOTONIC CRYSTALS
Issue Date
2014-09
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.105, no.13, pp. -
Abstract
We utilize the unique dispersion properties of leaky plasmon polaritons in epsilon-near-zero (ENZ) thin films to demonstrate thermal radiation control. Owing to its highly flat dispersion above the light line, a thermally excited leaky wave at the ENZ frequency out-couples into free space without any scattering structures, resulting in a narrowband, wide-angle, p-polarized thermal emission spectrum. We demonstrate this idea by measuring angle-and polarization-resolved thermal emission spectra from a single layer of unpatterned, doped semiconductors with deep-subwavelength film thickness (d/lambda(0) similar to 6 x 10(-3), where d is the film thickness and lambda(0) is the free space wavelength). We show that this semiconductor ENZ film effectively works as a leaky wave thermal radiation antenna, which generates far-field radiation from a thermally excited mode. The use of semiconductors makes the radiation frequency highly tunable by controlling doping densities and also facilitates device integration with other components. Therefore, this leaky plasmon polariton emission from semiconductor ENZ films provides an avenue for on-chip control of thermal radiation. (C) 2014 AIP Publishing LLC
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DOI
10.1063/1.4896573
ISSN
0003-6951
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