利用相变材料主动控制窄带热发射的设计规则
Design rules for active control of narrowband thermal emission using phase-change materials
AI总结：
本文提出一种无需光刻的解析设计框架，利用介电-介电型和介电-金属型相变材料实现红外窄带热发射的主动调谐，数值展示了近统一ON-OFF开关和任意大光谱偏移，且行为基本与角度无关。
摘要：
我们提出了一种解析框架，用于设计红外频率下可主动调谐的窄带热发射器。我们以相变材料（PCM）为例说明所提出的设计规则，考虑了介电-介电型PCM（如GSST）和介电-金属型PCM（如$\mathrm{VO_2}$）。基于这些，我们分别数值展示了接近统一的ON-OFF开关以及两个发射波长之间任意大的光谱偏移。所提出的系统无需光刻，由一个或几个薄发射层、一个包含PCM的间隔层和一个背反射器组成。我们的模型适用于正入射，尽管我们表明该行为基本上与角度无关。所提出的形式体系具有通用性，可以扩展到任何改变材料光学性质的机制，例如静电门控或热光调制。
英文摘要：
We propose an analytical framework to design actively tunable narrowband thermal emitters at infrared frequencies. We exemplify the proposed design rules using phase-change materials (PCM), considering dielectric-to-dielectric PCMs (e.g. GSST) and dielectric-to-metal PCMs (e.g. $\mathrm{VO_2}$). Based on these, we numerically illustrate near-unity ON-OFF switching and arbitrarily large spectral shifting between two emission wavelengths, respectively. The proposed systems are lithography-free and consist of one or several thin emitter layers, a spacer layer which includes the PCM, and a back reflector. Our model applies to normal incidence, though we show that the behavior is essentially angle-independent. The presented formalism is general and can be extended to \textit{any} mechanism that modifies the optical properties of a material, such as electrostatic gating or thermo-optical modulation.
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