论文标题
热发射的无光刻方向控制
Lithography-free directional control of thermal emission
论文作者
论文摘要
黑体热发射在空间上是扩散的。达到高度方向的热发射通常需要纳米结构，使热发射培养基的表面。最常见的配置是一个亚波长光栅，将表面极化模式从近场散射到远场，并产生热发射的天线样叶。但是，这个概念通常仅限于特定的线性极化，并且需要复杂的光刻。在这里，我们重新访问了平面索尔兹伯里屏幕的简单主题。我们通过分析显示，发射极层的介电介电常数的实际和假想部分之间的相互作用如何定义发射的方向特征，这可能从弥散到高度方向。我们提出了一种现实的配置，并表明六边形氮化硼薄膜可以在无光刻平台中启用光晶的热发射叶。
Blackbody thermal emission is spatially diffuse. Achieving highly directional thermal emission typically requires nanostructuring the surface of the thermally emissive medium. The most common configuration is a subwavelength grating that scatters surface polaritonic modes from the near-field to the far-field and produces antenna-like lobes of thermal emission. This concept, however, is typically limited to a particular linear polarization, and requires sophisticated lithography. Here, we revisit the simple motif of a planar Salisbury screen. We show analytically how the interplay between the real and imaginary part of the dielectric permittivity of the emitter layer defines the directional characteristics of emission, which can range from diffuse to highly directional. We propose a realistic configuration and show that hexagonal Boron Nitride thin films can enable grating-like thermal emission lobes in a lithography-free platform.
