Measuring the phase shift and polarity reversal of terahertz pulse due to half-wave loss

Zhen-wei Zhang; Kai-jun Mu; Liang-liang Zhang; Cun-lin Zhang

doi:10.1117/12.901585

11 August 2011 Measuring the phase shift and polarity reversal of terahertz pulse due to half-wave loss

Zhen-wei Zhang, Kai-jun Mu, Liang-liang Zhang, Cun-lin Zhang

Proceedings Volume 8195, International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications; 81951R (2011) https://doi.org/10.1117/12.901585
Event: International Symposium on Photoelectronic Detection and Imaging 2011, 2011, Beijing, China

Abstract

Half-Wave Loss (HWL) plays an important role in the optical effects and devices based on the thin film interference coatings, such as in fiber optical telecommunication, electron displays, optical storage as well as polarizing beam splitter with very high extinction ratios in both reflection and transmission. Using the reflective terahertz time-domain spectroscopy (THz-TDS), we present a direct and unambiguous observation of the polarity reversal due to the half-wave loss by comparing the single-cycle THz pulse normally reflected from the quartz-air interface with that from the quartzwater interface. In addition, a quantitative measurement of the phase shift is provided and the impact of the imaginary part of the complex refraction index on the phase shift is discussed. The measured results are in excellent agreement with the theoretical predictions.

Citation Download Citation

Zhen-wei Zhang, Kai-jun Mu, Liang-liang Zhang, and Cun-lin Zhang "Measuring the phase shift and polarity reversal of terahertz pulse due to half-wave loss", Proc. SPIE 8195, International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications, 81951R (11 August 2011); https://doi.org/10.1117/12.901585

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KEYWORDS

Terahertz radiation

Phase shifts

Reflection

Interfaces

Quartz

Water

Beam splitters

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