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首页> 外文会议>Nonlinear Optics and Its Applications VIII; and Quantum Optics III >Self-action effects in semiconductor quantum dots
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Self-action effects in semiconductor quantum dots

机译：半导体量子点中的自作用效应

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Two-dimensional (2D) dynamic photonic crystal regime has been utilized to investigate self-diffraction effect and nonlinear optical properties of excitons in CdSe/ZnS colloidal quantum dots (QDs). Self-diffraction at 2D photonic crystal arises for three intersecting beams of Nd~(+3):YAG laser second harmonic in the case of one-photon resonant excitation of the exciton (electron - hole) transition QDs. The relaxation time of excited excitons has been measured by pump and probe technique at induced one-dimensional transient diffraction grating. Two-exponential decay with initial fast and slow parts was discovered. Self-action effect has been discovered in the case of stationary resonant excitation of excitons in CdSe/ZnS QDs by the beam of second harmonic of powerful 12-nanosecond laser pulses. The bleaching of exciton absorption and the creation of transparency channel (this effect provokes self-diffraction of the second harmonic beam) was explained by the dominating coexisting and competing processes of state filling in stationary excited quantum dots and Stark-shift of exciton spectral band. The peculiarities of the influence of these processes at the change of exciton absorption in quantum dots in the case of different detuning from exciton resonance (quantum dots with different size have been used) was analyzed.
机译：二维（2D）动态光子晶体机制已被用于研究CdSe / ZnS胶体量子点（QDs）中激子的自衍射效应和非线性光学性质。在激子（电子-空穴）跃迁QD的单光子共振激发的情况下，Nd〜（+3）：YAG激光二次谐波的三个相交光束在2D光子晶体处产生自衍射。在激发的一维瞬态衍射光栅上，通过泵浦和探针技术测量了激发激子的弛豫时间。发现了具有初始快和慢部分的二指数衰减。在CdSe / ZnS QD中激子的稳态共振激发中，通过强大的12纳秒激光脉冲的二次谐波光束，发现了自作用效应。激子吸收的漂白和透明通道的产生（这种效应引起了二次谐波束的自衍射）是通过在稳态激发量子点中填充态和激子光谱带的斯塔克位移的主要共存和竞争过程来解释的。分析了在与激子共振失谐不同的情况下（已使用大小不同的量子点）这些过程对量子点中激子吸收变化的影响的特殊性。

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