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

Yemin Li; Danni Ma; Cunlin Zhang; Liangliang Zhang

doi:10.1117/12.2656226

16 December 2022 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, Infrared, Millimeter-Wave, and Terahertz Technologies IX; 1232416 (2022) https://doi.org/10.1117/12.2656226
Event: SPIE/COS Photonics Asia, 2022, Online Only

Conference Poster

Abstract

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.

Citation Download Citation

Yemin Li, Danni Ma, Cunlin Zhang, and Liangliang Zhang "Gouy phase shift of terahertz pulses observed using a water column as a probe", Proc. SPIE 12324, Infrared, Millimeter-Wave, and Terahertz Technologies IX, 1232416 (16 December 2022); https://doi.org/10.1117/12.2656226

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available