Quantum Manipulation of Reseaech Field and Material Field in Many-body Systems

这个小组的目标是从实验和理论上探索多体电子系统中的相互量子操纵效应。特别是，我们对微腔结构中的激子过程进行了广泛的研究。宫野从势能起伏引起的激子局域化和增强的辐射相互作用两个方面讨论了染料聚集系统的辐射过程。花村利用激子-微腔耦合系统研究了辐射场的量子力学操纵。提出了一种新的单光子和双光子压缩光产生方案，研究了激子-微腔耦合系统的非线性光学过程。在弱耦合区，由于内场的增强，相位共轭信号得到了很强的增强。在强耦合条件下，观察到了与偏振相关的简并四波混频过程，并用新提出的弱相互作用玻色子模型进行了解释。Gonokami还研究了介质微球中的光学过程，以探索光波三维限制的可行性。从直径为几微米的染料掺杂聚合物微球的激光阈值特性中获得了30%量级的自发辐射耦合率。通过矢量球谐函数的波动光学计算再现了所得数值和实验特征。岛田开发了一种基于图案化衬底上的选择性外延生长来制作有机体系光学波长尺度微结构的新技术。秋山开发了一种空间分辨率为100 nm的固体浸没透镜光学微探针技术。用这种方法研究了半导体微结构中的光学过程。

The object of this group is to explore, both experimentally and theorctically, the mutual quantum manipulation effects in many-body electron systems. Especially, we have extensively studied the excitonic processes in microcavity structures.Miyano has discussed the radiative processes of dye aggregate systems regarding the localization of excitons due to the potential fluctuations and enhanced radiative interaction.Hanamura has studied the quantum mechanical manipulation of radiation field utilizing exciton-microcavity coupled system. A new scheme for squeezed light generation by one and two-photon is proposed.Gonokami has studied the nonlinear optical processes of exciton-microcavity coupled system. In the weak-coupling regime, strong enhancement of phase conjugation signal due to the internal field enhancement was observed. In the strong-coupling regime, polarization dependent degenerate four-wave mixing processes were observed and explained by a newly proposed scheme of weakly interaction boson model.Gonokami has also examined the optical processes in dielectric micro spheres in order to explore the feasibility of three dimensional confinement of optical wave. A very high value for spontaneous emission coupling rate of the order of 30% has been obtained from the threshold characteristics of lasing from dye doped polymer spheres with diameter of few micrometers. The obtained value and the experimental features have been reproduced by the wave optics calculation with vector spherical harmonic functions.Shimada has developed a new technique to make optical wavelength scale micro structures of organic systems based on the selective epitaxial growth on patterned substrate.Akiyama has developed a new optical micro probe technique of solid immersion lens with a spatial resolution of 100 nm. With this method, optical processes in semiconductor microstructures have been studied.