随机介质中光子局域延迟时间的涨落及其与相位谱的关系
Fluctuations in photon local delay time and their relation to phase spectra in random media
摘要：
通过对场谱的傅里叶变换，得到了微波脉冲通过随机介质样品的时间演化规律。在局部或单通道延迟时间中发现大的波动，所述延迟时间是输出散斑图案中的点处的发射脉冲的第一时间矩。观察到局部延迟时间的正值和负值。最宽的分布被发现在低强度值附近的相位奇异性的透射散斑图案。在长持续时间、窄带宽入射脉冲的限制下，单通道延迟时间等于透射场相位的谱导数。因此，透射场相位的波动反映了介观系统中动力学的基本统计特性。
英文摘要：
The temporal evolution of microwave pulses transmitted through random dielectric samples is obtained from the Fourier transform of field spectra. Large fluctuations are found in the local or single channel delay time, which is the first temporal moment of the transmitted pulse at a point in the output speckle pattern. Both positive and negative values of local delay time are observed. The widest distribution is found at low intensity values near a phase singularity in the transmitted speckle pattern. In the limit of long duration, narrow-bandwidth incident pulses, the single channel delay time equals the spectral derivative of the phase of the transmitted field. Fluctuations of the phase of the transmitted field thus reflect the underlying statistics of dynamics in mesoscopic systems.
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