光-电调制二维阵列中的相干与非相干中红外辐射
Electro-optic modulation of coherent and incoherent mid-IR radiation in two-dimensional arrays
AI总结：
本研究提出了一种可用电地址的超表面，用于在二维空间中调制相干和非相干中红外辐射，展示了可调衍射和空间可重新配置的发射率调制。
摘要：
中红外（中红外）波长范围为3-8μm，对许多应用如气体传感和热成像都很重要。由于材料挑战，目前缺乏可重新配置的中红外光学元件。在此，我们提出了一种可用电地址的超表面，用于在二维空间中调制相干和非相干中红外辐射。我们的设备通过轻掺杂（10^19 cm^-3）的氧化铟锡（ITO）薄膜与间隙等离子体共振器中的场效应自由载流子耗尽实现光学调制。通过在超表面的32个个体上进行地址，我们首先展示了可调的相干反射中红外光衍射。接下来，我们引入了一种可扩展的周长地址驱动方案，用于二维可调衍射。最后，我们展示了在较高温度下具有空间可重新配置的二维图案的调制发射率。这项工作推动了中红外固态反射光束转向器件的发展，并促进了热发射非相干辐射的操控。
英文摘要：
Light in the mid-infrared (mid-IR) spans wavelengths from 3-8 $μ$m and is important to many applications such as gas sensing and thermal imaging. Due to materials challenges, there is currently a lack of mid-IR reconfigurable optical elements. Here, we present an electrically addressable metasurface for modulation of coherent and incoherent mid-IR radiation in two spatial dimensions. Our device achieves optical modulation due to the field-effect free-carrier depletion in a lightly doped ($10^{19}$ cm$^{-3}$) film of indium-tin-oxide (ITO) coupled to a gap plasmon resonator. By addressing 32 individual elements across the metasurface, we first demonstrate tunable diffraction of coherently reflected mid-IR light. Next, we introduce a scalable perimeter-addressed driving scheme for tunable diffraction in two dimensions. Finally, we demonstrate modulated emissivity with spatially reconfigurable two-dimensional patterns at elevated temperatures. This work advances the development of solid-state reflective beam-steering devices in the mid-IR and manipulation of thermally emitted incoherent radiation.
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