Study of single-cycle pulse propagation inside a terahertz near-field probe
Study of single-cycle pulse propagation inside a terahertz near-field probe
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DOI：
10.1063/1.1338962
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发表时间：
2001-01
影响因子：
4
通讯作者：
O. Mitrofanov;R. Harel;Mark Lee;L. Pfeiffer;K. West;J. Wynn;J. Federici
中科院分区：
文献类型：
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作者：
O. Mitrofanov;R. Harel;Mark Lee;L. Pfeiffer;K. West;J. Wynn;J. Federici
研究了0.5THz单周期脉冲在孔径型近场探测器中的传输。在距光圈不同距离处对电场幅度衰减进行了实验测量。基于二维模型的数值模拟显示了脉冲波形的变换和光谱蓝移，并在实验上观察到。研究表明，在不降低空间分辨率的情况下，通过减小孔径到探测器的间隔，可以将这种近场探头的灵敏度提高10倍以上。
Propagation of 0.5 THz single cycle pulses inside an aperture-type near-field probe is studied. The E-field amplitude attenuation is experimentally measured at various distances from the aperture. Numerical simulations based on a two-dimensional model illustrate the pulse waveform transformation and the spectral blueshift, which is experimentally observed. The study shows that the sensitivity of such a near-field probe can be improved by more than a factor of 10 by decreasing the aperture-to-detector separation without reduction of the spatial resolution.