Modulation of thermal radiation is an essential element of infrared sensing and imaging, thermal infrared light sources, camouflage, and thermophotovoltaics. Recently, tuneable thermal emission of nanophotonic structures has been demonstrated. However, most of the current strategies involve controlling single spectral thermal emission in the far‐infrared region, and blue shifting their resonances to the shorter wavelength region is rarely explored. Moreover, fast modulation of multispectral thermal radiation remains challenging. In this work, the dynamic control of multispectral thermal emission from 2 to 4 µm from an ultrathin reconfigurable metasurface is experimentally presented based on Au/SiO₂/Ge₂Sb₂Te₅/Au multilayer. This metadevice contains several integrated thermal emitters of various wavelengths, each of which consists of gold (Au) squares array with different widths. A tuning of multispectral absorptivity (emissivity) can be achieved by transiting the state of Ge₂Sb₂Te₅ from amorphous to crystalline. A heat‐transfer model is developed to demonstrate that the reversible switching of multispectral thermal emission can be achieved in just 300 ns. The experimental demonstration along with the theoretical framework lays the foundation for designing high‐speed reconfigurable multispectral thermal emitters, which, as expected, will initiate a new route to thermal engineering.

中文翻译：

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利用硫族化物超颖表面进行可调谐的热发射

热辐射的调制是红外传感和成像，红外热光源，伪装和热光伏的基本要素。最近，已经证明了可调节的纳米光子结构的热发射。但是，当前大多数策略都涉及控制远红外区域中的单个光谱热发射，并且很少探索将其共振转移到较短波长区域的蓝色。此外，多光谱热辐射的快速调制仍然具有挑战性。在这项工作中，基于Au / SiO ₂ / Ge ₂ Sb ₂ Te ₅实验性地提出了从超薄可重构超表面到2到4 µm的多光谱热发射的动态控制。/ Au多层。此元设备包含多个集成的各种波长的热发射器，每个发射器均由具有不同宽度的金（Au）方阵组成。通过将Ge ₂ Sb ₂ Te _5的状态从非晶态转变为结晶态，可以实现多光谱吸收率（发射率）的调节。开发了一个传热模型，以证明多光谱热发射的可逆切换仅需300 ns即可实现。实验演示和理论框架为设计高速可重构多光谱热辐射器奠定了基础，正如预期的那样，这将为热工程学开辟一条新途径。