Radiation of THz electromagnetic waves from semiconductor microcavity polaritons

半导体微腔极化激元的太赫兹电磁波辐射

• 批准号: 11650046
• 负责人: KADOYA Yutaka
• 金额: $ 2.37万
• 依托单位: Hiroshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650046/
• 关键词: Semiconductor microcavity; Cavity-polaritons; THz electromagnetic waves; Quantum confinc Stark effect; 高効率THz電磁波発生素子

In this project, we studied the radiation of THz electromagnetic waves from exciton-polariton in semiconductor microcavities. In particular, we focused on demonstrating the experimental evidences of THz-wave radiation from cavity polaritons. Another aim has been the investigation of coherent dynamics of cavity polaritons using the THz wave observation as a probe. The obtained results can be summarized as follows.1. Through our systematic experimental study, it was condidentially concluded that the THz wave is radiated from the nutation of exciton population, associated with the normal mode oscillation of cavity-polaritons under resonant excitation.2. We found that the frequency of the THz-wave is slightly higher than that expected from the energy difference between the two polariton modes. Such a deviation was shown to result from the difference between the energy differences observed in reflection spectra and the eigen (normal) modes of the polariton system, through the experiment and … More theoretical considerations.3. Increases of damping rates of the THz-waves were observed for the case that a high internal electric field is applied to the quantum wells. We showed that the faster damping is relevant to the broadening of exciton lines. Also, the damping rates were found to become higher under intense excitations.4. With the decrease of the cavity Q value, we also observed the faster damping of the oscillation in the THz-wave. In particular, only a single cycle, but rather strong THz-wave emission was observed. The results are the other manifestation that the oscillatory THz signals in high-Q cavities are due to the nutation of exsciton populations.5. We proposed a new scheme for the enhancement of THz electromagnetic wave radiation from semiconductor surfaces based on the efficient use of excitation power in bulk semiconductor microcavities. We demonstrated more than one-order of magnitude enhancement of the THz-wave radiation in comparison with off-the shelf bulk InAs which has been believed to be the best material for the THz-wave radiation. Less

本项目研究了半导体微腔中激子-极化激元的太赫兹电磁辐射。特别是，我们着重展示了腔极化激元产生太赫兹波辐射的实验证据。另一个目标是利用太赫兹波观测作为探针研究腔极化激元的相干动力学。所得结果可归纳如下.通过系统的实验研究，我们有条件地得出结论：太赫兹波是激子粒子数章动辐射的，与共振激发下腔极化激元的简正模振荡有关.我们发现，太赫兹波的频率略高于预期的两个极化激元模式之间的能量差。通过实验和理论分析，证明了这种偏离是由于在反射谱中观察到的能量差与极化激元系统的本征（简正）模之间的差异造成的。 ...更多信息 理论解释3.在高内电场作用于量子威尔斯阱的情况下，观察到了太赫兹波阻尼率的增加。我们发现，更快的阻尼是有关的激子线的加宽。同时，在强激励下，阻尼率会变高.随着谐振腔Q值的减小，太赫兹波振荡的衰减速度加快。特别是，只有一个周期，但相当强的太赫兹波发射被观察到。这一结果是高Q腔中振荡THz信号是由于激子粒子章动引起的又一种表现.基于体半导体微腔中激发功率的有效利用，提出了一种增强半导体表面太赫兹电磁波辐射的新方案。我们证明了超过一个数量级的增强的太赫兹波辐射相比，现成的散装铟砷已被认为是最好的材料的太赫兹波辐射。少

项目成果

M.Kusuda: "THz electromagnetic wave radiation from simiconductor microcavities in nonperturbative regime"Physica B. 272. 467-471 (1999)

M.Kusuda：“非微扰状态下半导体微腔的太赫兹电磁波辐射”Physica B. 272. 467-471 (1999)

M.Yamanishi 他: "THz-Electromagnetic Wave Radiation from Semiconductor Microcavities in Strong-and Weak-Coupling Regime (Invited)"Abstracts of IEEE LEOS 2000. 238-239 (2000)

M. Yamanishi 等人：“强弱耦合体系中半导体微腔的太赫兹电磁波辐射（受邀）” IEEE LEOS 2000 摘要。238-239 (2000)

M.Kusuda 他: "THz electromagnetic wave radiation from semiconductor microcavities in nonperturbative regime"Physica B. 272. 467-471 (1999)

M. Kusuda 等人：“非微扰状态下半导体微腔的太赫兹电磁波辐射”Physica B. 272. 467-471 (1999)

M.Kusuda: "THz electromagnetic wave radiation from semiconductor microcavities in nonperturbative regime"Physica B. vol.272. 467-471 (1999)

M.Kusuda：“非微扰状态下半导体微腔的太赫兹电磁波辐射”Physica B. vol.272。

Y.Kadoya 他: "Microcavity-induced enhancement of THz-wave radiation from semiconductor surfaces excited by short laser pulses"Abstract of International THz workshop. 63-63 (2000)

Y.Kadoya 等人：“短激光脉冲对半导体激发表面的太赫兹波辐射的微腔诱导增强”国际太赫兹研讨会摘要 63-63 (2000)。