Ali Muhammad O, Tait Niall, Gupta Shulabh
J Opt Soc Am A Opt Image Sci Vis. 2018 Jan 1;35(1):119-124. doi: 10.1364/JOSAA.35.000119.
A simple all-dielectric thermal emitter unit cell for narrowband gas-sensing application is proposed, providing large Q-factors compared to its plasmonic counterpart. It consists of a high-index dielectric-based elliptical puck on top of a back-reflector, providing narrowband thermal emission. Using full-wave simulations, it is demonstrated that the achievable Q-factors in this structure are orders of magnitude larger than what have been shown for plasmonic cells, thanks to their low-loss electrical characteristics. Furthermore, the thermal emission properties can be engineered by manipulating the geometry of the unit cell, whereby it is shown that these unit cells can provide polarized thermal emission simultaneously in two separate frequency bands, with identical Q-factor characteristics, depending on their ellipticity parameter.
提出了一种用于窄带气体传感应用的简单全介质热发射单元，与等离子体对应物相比，它具有较大的品质因数。它由位于背反射器顶部的基于高折射率电介质的椭圆形圆盘组成，可提供窄带热发射。通过全波模拟表明，由于其低损耗的电学特性，该结构中可实现的品质因数比等离子体单元所展示的品质因数大几个数量级。此外，可以通过操纵单元的几何形状来设计热发射特性，结果表明，根据椭圆率参数，这些单元可以在两个不同的频带中同时提供具有相同品质因数特性的偏振热发射。
