论文标题
来自分形纳米线网络对弱局部拉曼的定向控制
Directional control of weakly localized Raman from a random network of fractal nanowires
论文作者
论文摘要
无序的光学介质是一种能够强烈散射光的新兴材料。他们的研究与研究运输现象以及在成像，传感和能量存储中的应用相关。虽然这些材料可用于产生连贯的光，但它们的定向发射通常会因其非常多的散射性而阻碍。在这里，我们调整了由硅纳米线散布的相干拉曼光的平面外向。通过通过真实空间显微镜和傅立叶成像从随机的纳米线网络中可视化瑞利散射，光致发光和弱局部拉曼光，我们可以深入了解材料无弹性信号的光传输机制及其方向性。在此类纳米线网络中可视化和操纵方向相干光的可能性为无序介质中光传播的基本研究以及基于无序结构（包括传感器，光源和光源开关）的下一代光学设备的开发开辟了基础研究。
Disordered optical media are an emerging class of materials capable of strongly scattering light. Their study is relevant to investigate transport phenomena and for applications in imaging, sensing and energy storage. While such materials can be used to generate coherent light, their directional emission is typically hampered by their very multiple scattering nature. Here, we tune the out-of-plane directionality of coherent Raman light scattered by a fractal network of silicon nanowires. By visualizing Rayleigh scattering, photoluminescence and weakly localized Raman light from the random network of nanowires via real-space microscopy and Fourier imaging, we gain insight on the light transport mechanisms responsible for the material's inelastic coherent signal and for its directionality. The possibility of visualizing and manipulating directional coherent light in such networks of nanowires opens venues for fundamental studies of light propagation in disordered media as well as for the development of next generation optical devices based on disordered structures, inclusive of sensors, light sources and optical switches.
