Enhanced coherency of thermal emission: Beyond the limitation imposed by delocalized surface waves

Dahan, Nir; Niv, Avi; Biener, Gabriel; Gorodetski, Yuri; Kleiner, Vladimir; Hasman, Erez

doi:10.1103/physrevb.76.045427

Cited by 97 publications

(59 citation statements)

References 25 publications

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“…Any actual macroscopic thermal body cannot emit more thermal radiation than a blackbody. The Stefan-Boltzman law provides an important theoretical foundation for much of the recent works aiming to design nanophotonic structures in order to tailor the spatial and spectral properties of far-field thermal emission [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] .…”

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confidence: 99%

Enhancing far-field thermal emission with thermal extraction

Sergeant

Skauli

et al. 2013

Nat Commun

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The control of thermal radiation is of great current importance for applications such as energy conversions and radiative cooling. Here we show theoretically that the thermal emission of a finite-size blackbody emitter can be enhanced in a thermal extraction scheme, where one places the emitter in optical contact with an extraction device consisting of a transparent object, as long as both the emitter and the extraction device have an internal density of state higher than vacuum, and the extraction device has an area larger than the emitter and moreover has a geometry that enables light extraction. As an experimental demonstration of the thermal extraction scheme, we observe a four-fold enhancement of the far-field thermal emission of a carbon-black emitter having an emissivity of 0.85.

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confidence: 99%

Enhancing far-field thermal emission with thermal extraction

Sergeant

Skauli

et al. 2013

Nat Commun

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“…These incandescent sources are quasiisotropic sources (spatially incoherent) as opposed to antennas or lasers which produce directional beams (spatially coherent). Yet, highly directional incandescent sources have been demonstrated in the last ten years [23][24][25][26][27]. Despite a large number of contributions regarding either spectrally selective or directional thermal sources, to the best of our knowledge, there is only one report of a thermal source that combines both properties.…”

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confidence: 96%

Plasmonic Metasurface for Directional and Frequency-Selective Thermal Emission

et al. 2015

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International audienceIncandescent filaments and membranes are often used as infrared sources despite their low efficiency, broad angular emission, and lack of spectral selectivity. Here, we introduce a metasurface to control simultaneously the spectrum and the directivity of blackbody radiation. The plasmonic metasurface operates reliably at 600 °C with an emissivity higher than 0.85 in a narrow frequency band and in a narrow solid angle. This emitter paves the way for the development of compact, efficient, and cheap IR sources and gas detection systems

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“…Deep gratings can support resonances [14], while they perform inferior in coherence. ϵ λ;θ spectra in Fig.…”

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confidence: 99%

Grating profile optimization for narrow-band or broad-band infrared emitters with differential evolution algorithms

et al. 2012

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A stochastic method and its variants, differential evolution (DE) and micro-DE, were employed to optimize profiles of omnidirectional gratings for desired emittance spectra. Both narrow-band and broad-band infrared emitters were developed successfully from assigned profile types with different complexity and dimension constraints. The efficiency in determining profiles from each method was compared to demonstrate that the superiority of each method is dependent on the number of parameters (dimensions). The performance of the proposed emitters was further discussed considering the emission orientation and fabrication tolerance.

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Enhanced coherency of thermal emission: Beyond the limitation imposed by delocalized surface waves

Cited by 97 publications

References 25 publications

Enhancing far-field thermal emission with thermal extraction

Enhancing far-field thermal emission with thermal extraction

Plasmonic Metasurface for Directional and Frequency-Selective Thermal Emission

Grating profile optimization for narrow-band or broad-band infrared emitters with differential evolution algorithms

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