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Thermal Emission of Silicon at Near-Infrared Frequencies Mediated by Mie Resonances
ACS Photonics ( IF 7 ) Pub Date : 2019-12-06 , DOI: 10.1021/acsphotonics.9b01513
Roberto Fenollosa 1 , Fernando Ramiro-Manzano 1 , Moisés Garín 2, 3 , Ramón Alcubilla 3
Affiliation  

Planck’s law constitutes one of the cornerstones in physics. It explains the well-known spectrum of an ideal blackbody consisting of a smooth curve, whose peak wavelength and intensity depend on the temperature of the body. This scenario changes drastically, however, when the size of the emitting object is comparable to the wavelength of the emitted radiation. Here we show that a silicon microsphere (2–3 μm in diameter) heated to around 800 °C yields a thermal emission spectrum consisting of pronounced peaks that are associated with Mie resonances. We experimentally demonstrate in the near-infrared the existence of modes with an ultrahigh quality factor, Q, of 400, which is substantially higher than values reported so far, and set a new benchmark in the field of thermal emission. Simulations predict that the thermal response of the microspheres is very fast, about 15 μs. Additionally, the possibility of achieving light emission above the Planck limit at some frequency ranges is envisaged.

中文翻译:

三重共振介导的近红外频率下的硅热发射

普朗克定律是物理学的基石之一。它解释了由平滑曲线组成的理想黑体的众所周知的光谱,其峰值波长和强度取决于体温。但是,当发射物体的大小与发射辐射的波长相当时,这种情况会发生巨大变化。在这里,我们表明加热到800°C左右的硅微球(直径2-3μm)会产生由明显的峰组成的热发射光谱,这些峰与Mie共振相关。我们通过近红外实验证明了存在超高品质因数Q的模态,该数值为400,大大高于目前所报告的数值,并在热辐射领域树立了新的标杆。仿真预测,微球的热响应非常快,约为15μs。另外,设想在某些频率范围内实现超过普朗克极限的发光的可能性。
更新日期:2019-12-06
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