Wavelength-selective thermal emitters (WS-EMs) are of interest due to the lack of cost-effective, narrow-band sources in the mid- to long-wave infrared. WS-EMs can be realized via Tamm plasmon polaritons (TPPs) supported by distributed Bragg reflectors on metals. However, the design of multiple resonances is challenging as numerous structural parameters must be optimized simultaneously. Here we use stochastic gradient descent to optimize TPP emitters (TPP-EMs) composed of an aperiodic distributed Bragg reflector deposited on doped cadmium oxide (CdO) film, where layer thicknesses and carrier density are inversely designed. The combination of the aperiodic distributed Bragg reflector with the designable plasma frequency of CdO enables multiple TPP-EM modes to be simultaneously designed with arbitrary spectral control not accessible with metal-based TPPs. Using this approach, we experimentally demonstrated and numerically proposed TPP-EMs exhibiting single or multiple emission bands with designable frequencies, line-widths and amplitudes. This thereby enables lithography-free, wafer-scale WS-EMs that are complementary metal–oxide–semiconductor compatible for applications such as free-space communications and gas sensing.

由于在中长波红外中缺乏具有成本效益的窄带光源，波长选择热发射器 (WS-EM) 很受关注。WS-EM 可以通过金属上的分布式布拉格反射器支持的 Tamm 等离子体激元 (TPP) 实现。然而，多重共振的设计具有挑战性，因为必须同时优化许多结构参数。在这里，我们使用随机梯度下降来优化由沉积在掺杂氧化镉 (CdO) 薄膜上的非周期性分布布拉格反射器组成的 TPP 发射器 (TPP-EM)，其中层厚度和载流子密度是反向设计的。非周期性分布布拉格反射器与 CdO 的可设计等离子体频率相结合，可以同时设计多个 TPP-EM 模式，并具有金属基 TPP 无法实现的任意光谱控制。使用这种方法，我们通过实验证明并以数值方式提出了 TPP-EM，它们表现出具有可设计频率、线宽和幅度的单个或多个发射带。因此，这可以实现无光刻、晶圆级 WS-EM，它们是互补的金属-氧化物-半导体，适用于自由空间通信和气体传感等应用。