Study of size dependence of optical response due to nanoscale spatial structure of the response field

由于响应场的纳米级空间结构而研究光学响应的​​尺寸依赖性

• 批准号: 14540301
• 负责人: ISHIHARA Hajime
• 金额: $ 2.18万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540301/
• 关键词: Nanostructures; Excitons; Polaritons; Nonlinear optical response; Ultrafast response; Thin film; GaAs; Nonlocal response; 非線系応答; 内部電場; ナノ空間構造; 螺旋; 非線形応答; 光双安定

(1) We have theoretically clarified the mode structure of the coupled system of the radiation and the excitons confined in a thin film. The eigenenergies of the respective states include the negative shift at thin region, but they jump to the energies of the upper polaritons at a particular thickness for each state. If the resonant enhancement of the components of internal field associated with the respective states occurs before these jumps, the large nonlinear response appears. For the thicker case, the radiative decay constant becomes very large for the higher levels including the non-dipole type excitonic states.(2) By the time-resolved reflectance measurement of the GaAs multiple layers, we have verified that the radiative decay rate increases in proportion to the number of GaAs layers as predicted in the theory.(3) We have found the optical bistablity in nanoscale thinflim due to the nanoscale spatial structure of the internal field, and the novel photofunctions due to the nanoscale polarization orientation configurations.

(1)从理论上阐明了薄膜中辐射与激子耦合系统的模结构。各自状态的本征能包括薄区域的负移，但它们跃迁到每个状态在特定厚度的上极化子的能量。如果在这些跃迁发生之前，与各自状态相关的内部场分量发生共振增强，则会出现较大的非线性响应。在较厚的情况下，包括非偶极子型激子态在内的较高能级的辐射衰减常数变得非常大。(2)通过对多层GaAs的时间分辨反射率测量，验证了辐射衰减率与理论预测的GaAs层数成正比。(3)在纳米尺度薄层中，由于内部场的纳米尺度空间结构，我们发现了光学双稳定性，并且由于纳米尺度偏振取向配置，我们发现了新的光函数。

项目成果

H.Ishihara: "Nonlocality-induced multiple resonance in nonlinear optical process"Nonlinear Optics. 29. 663-669 (2002)

H.Ishihara：“非线性光学过程中的非局域性引起的多重共振”非线性光学。

H.Ishihara: "Nonlocality induced large degenerate-four-wave mixing of spatially extended non-dipole type excitonic state in GaAs thin layer"Phys.Rev.Lett.. Vol.89. 017402-(1-4) (2002)

H.Ishihara：“GaAs 薄层中空间延伸的非偶极型激子态的非定域性诱导大简并四波混合”Phys.Rev.Lett.. Vol.89。

H.Ishihara: "Nonlocality induced anomalous input-intensity dependence of optical response for weakly confined excitons in a ultrathin film"Phys.Rev.B. 67. 113302-1-113302-4 (2003)

H.Ishihara：“超薄膜中弱约束激子的光学响应的​​非局域性引起的反常输入强度依赖性”Phys.Rev.B。

H.Ishihara: "Nonlocality induced anomalous input-intensity dependence of optical response for weakly confined excitons in a ultrathin film"Phys.Rev.B. Vol.67. 113302(1-4) (2003)

H.Ishihara：“超薄膜中弱约束激子的光学响应的​​非局域性引起的反常输入强度依赖性”Phys.Rev.B。

H.Ishihara: "Anomalous size dependence of optical nonlinearities due to the excitonic coherence, Journal of Physics : Condensed Matter"Journal of Physics : Condensed Matter. 16. R247-R273 (2003)

H.Ishihara：“由于激子相干性导致光学非线性的异常尺寸依赖性，物理学杂志：凝聚态物质”物理学杂志：凝聚态物质。