Mr. Yemin Li Profile

Yemin Li

at Capital Normal Univ

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Proceedings Article | 16 December 2022 Poster + Paper

Gouy phase shift of terahertz pulses observed using a water column as a probe

Yemin Li, Danni Ma, Cunlin Zhang, Liangliang Zhang

Proceedings Volume 12324, 1232416 (2022) https://doi.org/10.1117/12.2656226

KEYWORDS: Terahertz radiation, Phase shifts, Wave propagation, Image resolution, Tomography, Terahertz spectroscopy, Spectroscopy, Signal detection, Optoelectronics

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The oscillation frequency of terahertz (THz) waves is between 0.1 THz and 10 THz. THz time-domain spectroscopy (THz-TDS) systems usually measure samples at the focus of THz beams. The Gouy phase shift has attracted widespread attention since it was discovered and has an important connection between the beam propagation dynamics and the dispersion of light waves. In this case, the Gouy phase shift affects the inversion dielectric spectrum of the sample. In order to more conveniently detect the phenomenon of Gouy phase shift, we propose a method of using a water column as a probe to detect the distribution of THz beams when they converge and directly observe the Gouy phase shift, owing to the sensitivity of this detection method to THz amplitude and phase. The Gouy phase shift in the THz band can be observed with simple processing by detecting the THz time domain signal under different water column position using THz-TDS. This method is of great significance for better selection of THz sources and coherence tomography of samples in the future. At the same time, it provides more help to control the Gouy phase shift to develop phase-shift interference technology and enhance the depth resolution of THz imaging.

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