Fourier-transform THz spectroscopy based on electric-field interferometry using THz-PMT

Hisanari Takahashi*, Tobias O. Buchmann, Matej Sebek, Simon J. Lange, Naoya Kawai, Kota Katsuyama, Ken Nagumo, Peter U. Jepsen, Takayuki Omura, Hiroshi Satozono

*Corresponding author for this work

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Abstract

We demonstrate a high dynamic range (DR) Fourier-transform-based terahertz (THz) spectrometer by combining a THz photomultiplier tube (PMT) with a metasurface and a conventional Michelson interferometer. Because the THz-PMT response depends on the incident electric-field strength following the Fowler–Nordheim equation, we can directly obtain an electric field interferogram without any synchronized optical probe pulse in contrast to conventional THz-time-domain-spectroscopy (THz-TDS). The DR of the corresponding power spectrum using the proposed method was 4.6 × 105 without the use of a lock-in amplifier. The complex refractive index of a quartz glass plate obtained using the proposed method was in good agreement with the results of conventional THz-TDS.

Original languageEnglish
JournalOptics Express
Volume32
Issue number7
Pages (from-to)12774-12782
ISSN1094-4087
DOIs
Publication statusPublished - 25 Mar 2024

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