论文标题
使用拉曼光谱法探测2D材料中的双曲线和表面声子 - 两极
Probing Hyperbolic and Surface Phonon-Polaritons in 2D materials using Raman Spectroscopy
论文作者
论文摘要
声子 - 两极的双曲线色散关系（PHPOL）提供了高弹药状态，高度方向的传播，副式限制，较大的态光密度以及增强的光 - 互动。在这项工作中，我们在方便的反向散射配置中使用拉曼光谱探测Gase中的PHPOL，这是一种2D材料，呈现出两个由\ textit {double} retstrahlen频段隔开的双曲线区域。通过改变入射角，揭示了分散关系。拉曼光谱计算证实了一个表面和两个非凡的引导极化子的观察，并与Phpol频率的演变匹配，这是约束的函数。靠近激发态的共振激发奇异地提升了Phpol的散射效率。非中心对称2D材料中PHPOL的拉曼光谱不需要任何波形匹配策略。它可以广泛使用，它可能会加速miR纳米光子设备和应用的开发。
The hyperbolic dispersion relation of phonon-polaritons (PhPol) provides high-momentum states, highly directional propagation, subdiffractional confinement, large optical density of states, and enhanced light-matter interactions. In this work, we use Raman spectroscopy in the convenient backscattering configuration to probe PhPol in GaSe, a 2D material presenting two hyperbolic regions separated by a \textit{double} reststrahlen band. By varying the incidence angle, dispersion relations are revealed. Raman spectra calculations confirm the observation of one surface and two extraordinary guided polaritons and matches the evolution of PhPol frequency as a function of confinement. Resonant excitation close to the excitonic state singularly exalts the scattering efficiency of PhPol. Raman spectroscopy of PhPol in non-centrosymmetry 2D materials does not require any wavevector matching strategies. Widely available, it may accelerate the development of MIR nanophotonic devices and applications.
