High-resolution spectroscopy of free induction decay from gas molecules excited by broadband terahertz pulses

Authors

  • Takashi Furuya ⋅ JP Research Center for Development of Far-Infrared Region, University of Fukui, Japan

Abstract

The advantage of terahertz time-domain spectroscopy (THz-TDS) is that absorption spectra can be obtained over a wide frequency range of about 0.1–4 THz. On the other hand, one of the issues with THz-TDS is its low frequency resolution. In this study, the broadband terahertz pulses were used as a light source to excite gas molecules, and the free-induction decay emitted from the gas molecules was measured by using a subharmonic mixer instead of a photoconductive antenna or electro-optic sampling. The THz free-induction decay signal was down-converted by the mixer to several hundred MHz signals and detected by a sampling oscilloscope. The resulting frequency resolution was more than one order of magnitude better than the typical time-domain spectroscopy, although the measurable frequency range in a single scan was about 1 GHz, depending on the bandwidth of the mixer used and the measurement system.

About the Speaker

Takashi Furuya, Research Center for Development of Far-Infrared Region, University of Fukui, Japan

Takashi Furuya received his Ph.D. degree from the University of Fukui in 2005. He worked as a researcher at the University of Fukui's Far-Infrared Region Development Research Center (FIR UF) until 2009, and then as a technical staff member at FIR UF until 2014. He was appointed as an assistant professor at FIR UF in 2015. He is a lecturer of FIR UF from 2024.

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Issue

Article ID

SPP-2024-INV-1J-04

Section

Invited Presentations

Published

2024-07-03

How to Cite

[1]
T Furuya, High-resolution spectroscopy of free induction decay from gas molecules excited by broadband terahertz pulses, Proceedings of the Samahang Pisika ng Pilipinas 42, SPP-2024-INV-1J-04 (2024). URL: https://proceedings.spp-online.org/article/view/SPP-2024-INV-1J-04.