论文标题
激活的范德华元面部的激发梁转向
Excitonic beam steering in an active van der Waals metasurface
论文作者
论文摘要
二维过渡金属二分法（2D TMDC）由于具有强大的可调式激发共振而主导其光学响应，因此对超薄活性纳米光子元件是有前途的候选者。在这里，我们通过活跃的范德华元面说明了动态光束转向，该范围的跨表面利用了单层钼（Mose2）的激素共振附近的大型复杂折射率可调性。通过改变激子的辐射率和非辐射率，我们可以动态控制反射振幅和相位剖面，从而导致激子阶段的阵列跨表面。我们的实验表明，在三个不同的谐振波长中，反射的光转向-30°至30°之间的角度，与A激子，B激子和TRION相对应。这种活跃的范德华元面完全依赖于单层Mose2材料的激发共振，而不是图案化的纳米结构的几何共振，这表明有可能利用新出现的光子应用中波浪前形成的激发型共振的可调性。
Two-dimensional transition metal dichalcogenides (2D TMDCs) are promising candidates for ultra-thin active nanophotonic elements due to the strong tunable excitonic resonances that dominate their optical response. Here we demonstrate dynamic beam steering by an active van der Waals metasurface that leverages large complex refractive index tunability near excitonic resonances in monolayer molybdenum diselenide (MoSe2). Through varying the radiative and nonradiative rates of the excitons, we can dynamically control both the reflection amplitude and phase profiles, resulting in an excitonic phased array metasurface. Our experiments show reflected light steering to angles between -30° to 30° at three different resonant wavelengths corresponding to the A exciton, B exciton, and trion. This active van der Waals metasurface relies solely on the excitonic resonances of the monolayer MoSe2 material rather than geometric resonances of patterned nanostructures, suggesting the potential to harness the tunability of excitonic resonances for wavefront shaping in emerging photonic applications.
