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20 August 2020 Super Planckian thermal radiation emitted into the far-field from a nano-filament of photonic crystal
Shawn-Yu Lin, Mei-Li Hsieh, Sajeev John
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Proceedings Volume 11498, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XIV; 1149805 (2020) https://doi.org/10.1117/12.2569364
Event: SPIE Optical Engineering + Applications, 2020, Online Only
Abstract
Planck’s law predicts the distribution of radiation energy, color and intensity, emitted from a hot object at thermal equilibrium. The Law also sets the upper limit of radiation intensity, the blackbody limit. Recent experiments reveal that micro-structured tungsten can exhibit significant deviation from the blackbody spectrum. However, whether thermal radiation with weak non-equilibrium pumping can exceed the blackbody limit in the far field remains un-answered. Here, we use a tungsten photonic-crystal with a partially coated black surface to show that far-field thermal radiation can exceed the blackbody limit by > 8 times at 1.7 micrometer resonant wavelength. This finding is attributed to non-linear Bloch-waves and the excitation of dipole-active tungsten resonators throughout the photonic-crystal. This discovery could help create super-intense LED-like thermal light sources and even thermal emitters with laser-like input-output characteristics.
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Shawn-Yu Lin, Mei-Li Hsieh, and Sajeev John "Super Planckian thermal radiation emitted into the far-field from a nano-filament of photonic crystal", Proc. SPIE 11498, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XIV, 1149805 (20 August 2020); https://doi.org/10.1117/12.2569364
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KEYWORDS
Photonic crystals
Black bodies
Tungsten
Light sources
Resonators
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