论文标题
通过红外谐振拉曼效应对材料光学特性的超快控制
Ultrafast control of material optical properties via the infrared resonant Raman effect
论文作者
论文摘要
拉曼效应 - 通过晶格振动对光的非弹性散射（声子） - 产生与材料的晶体结构紧密相关的光学响应。在这里，我们表明，IR和拉曼声子的共振光激发产生了拉曼散射效应，该散射效应可以诱导向折射指数巨大的移动，并诱导在平衡晶体结构中禁止的新光学常数。我们完成了由晶体绝缘子中耦合的IR和拉曼声子介导的光 - 物质相互作用的描述，这是目前通过在非线性晶状体极化性中包括遗忘的途径，这是旨在动态控制材料特性的众多实验的重点。我们的工作通过揭示Terahertz间隙内的光吸收可以在广泛的频率范围内控制材料的光学性质，从而扩展了用于控制和开发新光学技术的工具集。
The Raman effect -- inelastic scattering of light by lattice vibrations (phonons) -- produces an optical response closely tied to a material's crystal structure. Here we show that resonant optical excitation of IR and Raman phonons gives rise to a Raman scattering effect that can induce giant shifts to the refractive index and induce new optical constants that are forbidden in the equilibrium crystal structure. We complete the description of light-matter interactions mediated by coupled IR and Raman phonons in crystalline insulators -- currently the focus of numerous experiments aiming to dynamically control material properties -- by including a forgotten pathway through the nonlinear lattice polarizability. Our work expands the toolset for control and development of new optical technologies by revealing that the absorption of light within the terahertz gap can enable control of optical properties of materials over a broad frequency range.
