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Extraction of optical constants using multiple reflections in the terahertz emitter-sample hybrid structure

机译:在太赫兹发射器-样品混合结构中使用多次反射提取光学常数

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To extract optical constants of nontransmitted samples in the terahertz (THz) spectral region, we employ a THz emitter-sample hybrid structure where THz pulses are generated at the emitter surface and multiply reflected at the interface between the THz emitter and the sample. Since each THz electric field profile appears well separated in a time domain, we could obtain the amplitude and phase spectra for each pulse from the Fourier transform, and determine the optical constants of the sample numerically based on the Fresnel equations. We applied this technique for doped semiconductors, and found that obtained optical constants are in good agreement with the values determined by using other conventional THz techniques.
机译:为了提取太赫兹(THz)光谱区域中非透射样品的光学常数,我们采用了THz发射器-样品混合结构,其中THz脉冲在发射器表面产生,并在THz发射器和样品之间的界面处倍增反射。由于每个太赫兹电场轮廓在时域中似乎都很好地分开,因此我们可以从傅立叶变换中获得每个脉冲的振幅和相位光谱,并根据菲涅耳方程式以数值方式确定样品的光学常数。我们将此技术应用于掺杂半导体,发现获得的光学常数与使用其他常规THz技术确定的值非常吻合。

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