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arXiv 2409.14973physics.optics
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反射式太赫兹时域光谱中相位不准确性对提取复折射率的影响

Influence on extracted complex refractive index from phase inaccuracy of reflection-type THz-time-domain spectroscopy

Jeong Woo Han

AI总结:

本研究考察了反射式太赫兹时域光谱中参考与样品放置错位导致的相位不准确性对提取复折射率的影响,发现错位超过3 μm会引发显著误差。

摘要:

反射式太赫兹(THz)时域光谱(THz-TDS)能够测量不透明样品在THz频率范围内的光学性质,例如载流子浓度和迁移率。本研究考察了相位不准确性对从反射式THz-TDS提取复折射率的影响。相位不准确性通常源于作为参考的完美反射体与目标样品之间的放置错位。通过考虑自由载流子和束缚载流子主导光学性质的两个代表性系统,并引入任意偏移的放置错位,我们证实当错位位置超过3 μm时,提取的复折射率会出现显著误差。

英文摘要:

Reflection-type terahertz (THz) time-domain spectroscopy (THz-TDS) enables the measurement of optical properties of opaque samples in the THz frequency range, e.g., carrier density and mobility. In this study, we examine the influence of phase inaccuracy on the extracted complex refractive index from reflection-type THz-TDS. Phase inaccuracy often arises from the placement mismatch between the perfect reflector, serving as the reference, and the target samples in reflection-type THz-TDS. By considering two representative systems, where free and bound carriers dominate optical properties, and introducing arbitrarily shifted placement mismatch, we confirm that significant errors in the extracted complex refractive index occur when the mismatch position exceeds 3 μm.

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