非平衡耦合天线的圆极化热辐射
Circularly polarized thermal radiation from nonequilibrium coupled antennas
摘要：
圆偏振光可以通过偏振转换或结构手性获得。在这里，我们揭示了一个根本无关的机制，产生圆偏振光使用耦合非平衡源。我们表明，从一个紧凑的二聚体的亚波长，各向异性天线的热辐射可以高度圆极化时，天线是在不平等的温度。此外，发射光的旋向在互换天线的温度时翻转，从而使得能够重构大多数圆偏振光源所缺乏的偏振状态。我们使用严格的波动电动力学分析描述了这种机制的基本起源，并进一步提供其实验实施的实际例子。除了在可重构器件，通信和传感技术的应用，这项工作激发了新的查询角动量相关的热辐射现象，使用热不平衡，没有施加磁场。
英文摘要：
Circularly polarized light can be obtained by using either polarization conversion or structural chirality. Here we reveal a fundamentally unrelated mechanism of generating circularly polarized light using coupled nonequilibrium sources. We show that thermal emission from a compact dimer of subwavelength, anisotropic antennas can be highly circularly polarized when the antennas are at unequal temperatures. Furthermore, the handedness of emitted light is flipped upon interchanging the temperatures of the antennas, thereby enabling reconfigurability of the polarization state lacked by most circularly polarized light sources. We describe the fundamental origin of this mechanism using rigorous fluctuational electrodynamic analysis and further provide practical examples for its experimental implementation. Apart from the technology applications in reconfigurable devices, communication, and sensing, this work motivates new inquiries of angular-momentum-related thermal-radiation phenomena using thermal nonequilibrium, without applying magnetic field.
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