Quantum Manipulation of Readiation Field in Semiconductor Microstructures

1)基于电子和光子系统量子控制的半导体发光体a)微腔控制自发辐射：利用量子受限斯塔克效应(QCSE)，研究表明，在光激励下，半导体微腔中自发辐射的各种特性，如发射强度、辐射模式、辐射复合寿命等都发生了改变。在此基础上，制作了具有电流载流子注入和量子阱电场作用的半导体微腔光发射器作为实际器件的原型，并在低温下实现了器件的工作。除了这些自发辐射控制实验外，还从实验上阐明了振子强度和激子线宽对高Q微腔中腔-极化子色散的影响。此外，太赫兹电磁波…的可能性B)亚泊松光子通量产生：从实验和理论上研究了半导体发光二极管(LED)中亚泊松光产生的机理。阐明了电子或空穴泵浦和复合过程的作用。在实验中，即使通过使用商业上可用的LED，也表明在恒流操作下，可以在100 MHz的宽频率范围内产生亚泊松光。此外，通过使用串联LED，显示了即使在恒压操作下也能产生亚泊松光。这些实验是在室温下进行的。在理论研究中，提出了QCSE阻挡光子产生的方法。计算机模拟结果表明，即使在恒压工作下，在超低电流(~10nA)、极短时间尺度(100ps)下，光子数涨落在10光子尺度内也会被压缩。2)关于低维电子与量子化光子场相互作用的理论指出，介质中腔量子电动力学(QED)的原有理论框架存在种种问题。通过考虑介质中的偏振作为量子化的自由介质，研究了动态Casimir效应产生的光子和吸收腔中的自发辐射等各种QED效应。3)提出了由(C6H5C2H4NH3)2PbI4形成的自然量子阱分布反馈反射器微腔的自发辐射控制。观察了极化振子模的形成和定向自发辐射。较少

1) Semiconductor Light Emitters based on the quantum control of electron and photon systemsa) Spontaneous emission control by microcavity : Using quantum confined Stark effect (QCSE), it was shown that, under optical excitation, various characteristics of the spontaneous emissions such as the emission intenisity, radiation patterns, and the rediative recombination lifetime are modified in semiconductor microcavities. Then, as a prototype of the practical device, semiconductor microcavity light emitters, which has both the functions of carrier injection by current and the application of electric field in the QW, was fabricated and, at low temperature, the device operation has been confirmed. In addition to these experiments on spontaneous emission control, the influence of the oscillator strength and the linewidth of the excitons on the cavity-polariton dispersion, which apears in high-Q micorcavities, has been clarified experimentally. Also, the possibility of THz electromagnetic wave … More generation was pointed out (patented).b) Sub-poissonian photon flux generation : The mechanisms of the sub-Poissionian light generation in semiconductor light emitting diodes (LEDs) were investigated experimentaly and theoreticaly. The role of the electron or hole pump and the recombination processes was clarified. In the experiments, even by the use of commercially available LEDs, it was shown that the generation of sub-Poissionian lights over a wide frequency range, 100 MHz is possible under constant-current operation. In addition, the sub-Poissonian lights was shown to be generated even under constant-voltage operation, by the use ot series-connected LEDs. These experiments were performed at room temperature. In theoretical studies, QCSE blockade for the photon generation was proposed. By computer simulations, it was shown that even under constant voltage operation, the photon number fluctuations are squeezed in 10-photon scale, under ultra-low current level (〜10nA), in very short time-scale (100ps).2) Theories on the interactions between low-dimensional electrons and quantized photon field It was pointed out that there arises various problems in the former theoretical framework of the cavity quantum electrodynamics (QED) in a medium. By taking into account the polarizations in a medium as quantized freedums, various QED effects such as the photon generation by dynamical Casimir effect and the spontaneous emissions in absorptive cavity were investigated.3) Spontaneous emission control in natural quantum wells Distributed feedback reflector micorcavity formed by the corting of thin natural quantum well films ((C6H5C2H4NH3)2PbI4) on a grating-patterned substrate was proposed. The formation of polariton modes and the directional spontaneous emissions were ovserved. Less