Nanophotonic engineering of light–matter interaction at subwavelength scale allows thermal radiation that is fundamentally different from that of traditional thermal emitters and provides exciting opportunities for various thermal-photonic applications. We propose a new kind of integrated and electrically controlled thermal emitter that exploits layered metamaterials with lithography-free and dielectric/metallic nanolayers. We demonstrate both theoretically and experimentally that the proposed concept can create a strong photonic bandgap in the visible regime and allow small impedance mismatch at the infrared wavelengths, which gives rise to optical features of significantly enhanced emissivity at the broad infrared wavelengths of 1.4–14 μm as well as effectively suppressed emissivity in the visible region. The electrically driven metamaterial devices are optically and thermally stable at temperatures up to ∼800 K with electro-optical conversion efficiency reaching ∼30%. We believe that the proposed high-efficiency thermal emitters will pave the way toward integrated infrared light source platforms for various thermal-photonic applications and particularly provide a novel alternative for cost-effective, compact, low glare, and energy-efficient infrared heating.

中文翻译：

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由分层超材料实现的集成式和光谱选择性热辐射器

在亚波长范围内，光-物质相互作用的纳米光子工程可以实现与传统热辐射器根本不同的热辐射，并为各种热光子应用提供令人兴奋的机会。我们提出了一种新型的集成电控热发射器，该发射器利用了具有无光刻技术和介电/金属纳米层的层状超材料。我们在理论和实验上都证明了所提出的概念可以在可见光状态下产生很强的光子带隙，并在红外波长处允许较小的阻抗失配，从而在1.4–14μm的宽红外波长处产生明显增强的发射率的光学特性以及有效抑制可见光区域的发射率。电驱动的超材料设备在高达约800 K的温度下具有光学和热稳定性，电光转换效率达到约30％。我们相信，提出的高效热辐射器将为各种热光子应用的集成红外光源平台铺平道路，并特别为经济高效，紧凑，低眩光和高能效的红外加热提供新颖的替代方案。