1. Fourier-transform THz spectroscopy based on electric-field interferometry using THz-PMT
- Author
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Takahashi, Hisanari, Buchmann, Tobias O., Sebek, Matej, Lange, Simon J., Kawai, Naoya, Katsuyama, Kota, Nagumo, Ken, Jepsen, Peter U., Omura, Takayuki, Satozono, Hiroshi, Takahashi, Hisanari, Buchmann, Tobias O., Sebek, Matej, Lange, Simon J., Kawai, Naoya, Katsuyama, Kota, Nagumo, Ken, Jepsen, Peter U., Omura, Takayuki, and Satozono, Hiroshi
- 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.
- Published
- 2024