Visible Wavelength Flatband in a Gallium Phosphide Metasurface
Visible Wavelength Flatband in a Gallium Phosphide Metasurface
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DOI：
10.1021/acsphotonics.3c00175
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发表时间：
2023-02
期刊：
影响因子：
7
通讯作者：
Christopher Munley;Arnab Manna;David Sharp;Minho Choi;Hao A. Nguyen;B. Cossairt;Mo Li;A. Barnard;A. Majumdar
中科院分区：
文献类型：
--
作者：
Christopher Munley;Arnab Manna;David Sharp;Minho Choi;Hao A. Nguyen;B. Cossairt;Mo Li;A. Barnard;A. Majumdar
对超表面中的光色散进行工程设计可以控制限制在超表面中的光与放置在其近场内的材料之间的光与物质相互作用的强度。具体来说，设计平带色散可以增加光子态密度，从而增强光与物质的相互作用。在这里，我们通过实验证明了在可见波长下具有平坦色散的超表面。我们设计并制造了悬浮的一维磷化镓超表面，并通过能量动量光谱测量了光子带结构，观察到在 $\sim 580$nm 处平坦超过 $10^o$ 半角的光子带。我们将硒化镉纳米片与超表面集成，并测量了平带中的耦合光致发光。我们对光子平带的演示将使将新兴量子发射器集成到超表面上成为可能，并可能在非线性图像处理和拓扑光子学中得到应用。
Engineering the dispersion of light in a metasurface allows for controlling the light-matter interaction strength between light confined in the metasurface and materials placed within its near-field. Specifically, engineering a flatband dispersion increases the photonic density of states thereby enhancing the light-matter interaction. Here, we experimentally demonstrate a metasurface with a flat dispersion at visible wavelengths. We designed and fabricated a suspended one-dimensional gallium phosphide metasurface and measured the photonic band structure via energy-momentum spectroscopy, observing a photonic band that is flat over $10^o$ of half-angle at $\sim 580$nm. We integrated cadmium selenide nanoplatelets with the metasurface, and measured coupled photoluminescence into the flatband. Our demonstration of a photonic flatband will enable the possibility of integrating emerging quantum emitters to the metasurface with possible applications in nonlinear image processing, and topological photonics.