Near-Field Optics of Fractals

9500258沙拉耶夫理论研究将在分形集合体和自仿射薄膜中进行光学过程。这些天体表现出令人着迷的光学现象，包括拉曼散射和光学相位共轭信号的巨大增强。在明显小于波长的范围内，分形物体中的光学模式似乎是强烈局域化的。这项研究将研究这些局域模以及与它们相关的近场结构。光激发在分形中的局域化导致了高局域场的区域，从而导致了许多光学过程的增强。由于纳米颗粒的分形聚集体和自仿射表面的非线性光学效率得到了极大的提高，因此将其发展为一类新的光学和光电子材料具有重要的意义。这项研究将纳米复合材料的光学和近场光学显微镜这两个不断发展的领域结合在一起。在分形图的情况下，这些场内在地联系在一起。将对金属颗粒聚集体和粗糙薄膜的非线性光学性质进行理论研究，这些薄膜的特征是分维--也就是我们习惯的二维和三维以外的维度。除了研究这些新材料的基本行为外，还将探索潜在的设备应用。***

9500258 Shalaev Theoretical research will be conducted on optical processes in fractal aggregates and in self-affine thin films. These objects exhibit fascinating optical phenomena including huge enhancements of Raman scattering and optical phase conjugation signals. Optical modes in fractal objects appear to be strongly localized within ranges which are significantly less than the wavelength. The research will study these localized modes and the near-field structures associated with them. The localization of the optical excitations in fractals results in regions of high local fields leading to an enhancement of a number of optical processes. Because the nonlinear optical efficiency is so greatly enhanced in fractal aggregates of nano-particles and on self-affine surfaces, there is significant interest in developing them as a new class of optical and optoelectronic materialq. The research brings together two evolving fields, the optics of nano-composites and near-field optical microscopy. These fields are inherently connected in the case of fractals. %%% Theoretical research will be conducted on the nonlinear optical properties of aggregates of metallic particles and on rough thin films which are characterized by fractal dimensions - that is dimensions which are other than the usual two-and three-dimension which we are accustomed to. Besides looking at the fundamental behavior of these novel materials, potential device applications will be explored. ***