Vienna Center for Quantum Science and Technology, TU Wien-Atominstitut, Stadionallee 2, 1020 Wien, Austria.
Phys Rev Lett. 2013 Jul 12;111(2):024301. doi: 10.1103/PhysRevLett.111.024301. Epub 2013 Jul 9.
Modeling and investigating the thermalization of microscopic objects with arbitrary shape from first principles is of fundamental interest and may lead to technical applications. Here, we study, over a large temperature range, the thermalization dynamics due to far-field heat radiation of an individual, deterministically produced silica fiber with a predetermined shape and a diameter smaller than the thermal wavelength. The temperature change of the subwavelength-diameter fiber is determined through a measurement of its optical path length in conjunction with an ab initio thermodynamic model of the fiber structure. Our results show excellent agreement with a theoretical model that considers heat radiation as a volumetric effect and takes the emitter shape and size relative to the emission wavelength into account.
从第一性原理出发，对具有任意形状的微观物体的热化过程进行建模和研究具有重要的意义，并可能带来技术应用。在这里，我们在很大的温度范围内研究了由于远场热辐射而导致的单个、确定性产生的具有预定形状和直径小于热波长的二氧化硅纤维的热化动力学。通过测量光纤的光程长度并结合光纤结构的从头算热力学模型，确定亚波长直径光纤的温度变化。我们的结果与一个理论模型非常吻合，该模型将热辐射视为一种体积效应，并考虑了发射器的形状和尺寸相对于发射波长的影响。
