Optical tunneling of single-cycle terahertz bandwidth pulses.
Optical tunneling of single-cycle terahertz bandwidth pulses.
复制标题
单周期太赫兹带宽脉冲的光隧道。
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
R. Cheville
中科院分区：
文献类型：
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作者：
M. Reiten;D. Grischkowsky;R. Cheville
我们报道了太赫兹电磁脉冲在受阻全内反射过程中光隧道传输的亚皮秒分辨率的时间域测量。通过在3太赫兹带宽上测量发射的电磁脉冲，可以在一次测量中直接确定薄的和不透明的势垒极限中的频率相关的相位和幅度变化。基于线性色散理论和光学势垒中复角菲涅耳系数，建立了描述光学势垒传输的复频率响应函数。在实验确定的带宽范围内，我们的测量结果与该理论模型非常一致；该模型没有对通过势垒的光束路径进行任何假设，也没有可调整的参数。该理论满足Kramers-Kronig关系，表明了跨越势垒的因果传播。
We report time-domain measurements with subpicosecond resolution of optical tunneling of terahertz electromagnetic pulses undergoing frustrated total internal reflection. Measurements of the transmitted electromagnetic pulses over a 3 THz bandwidth permits direct determination of frequency-dependent phase and amplitude changes in both the thin and opaque barrier limits in a single measurement. A complex frequency response function describing propagation through the barrier is developed based upon linear dispersion theory and the Fresnel coefficients at complex angles in the optical barrier. Our measurements are in excellent agreement with this theoretical model across the experimentally determined bandwidth; the model makes no assumptions about the beam path through the barrier and has no adjustable parameters. The theory is shown to satisfy the Kramers-Kronig relations, indicating causal propagation across the barrier.