A novel terahertz detector technology based on vacuum electronics

Naoya Kawai*, Tobias Olaf Buchmann, Hisanari Takahashi, Kota Katsuyama, Simon Jappe Lange, Matej Sebek, Peter Uhd Jepsen, Hiroshi Satozono, Takayuki Ohmura

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

A THz detector with both high sensitivity and fast time response has been required for industrial applications such as nondestructive testing (NDT), security, and spectroscopy. Through a collaboration with the Technical University of Denmark (DTU), we have recently developed a THz-sensitive point detector and imager based on metasurface and photomultiplier tube (PMT) and image intensifier (I.I.) technologies, respectively. A fast time response is one of the unique characteristics of these devices: the PMT-based point detector provides a nanosecond response time while the I.I.based imager is capable of frame rates up to 1000 fps. These devices have a double split-ring resonator (DSRR) at the photocathode for THz-electron conversion (metasurface). In this paper, we discuss the two devices and report on the development and results for increasing their sensitivity for ultrafast, broadband THz pulses by sharpening the field-enhancing antenna tips. This leads to a smaller tip diameter, which increases the electric field confinement and thus intensity at the tip, making the field emission more likely to occur at lower field strengths as a result. Both devices thus offer a sensitive and simple method to detect THz frequencies easily, with the I.I. offering a handheld, 9V battery-powered device.

Original languageEnglish
Title of host publicationTerahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVI
EditorsLaurence P. Sadwick, Tianxin Yang
PublisherSPIE - International Society for Optical Engineering
Publication date2023
Article number1242009
ISBN (Electronic)9781510659452
DOIs
Publication statusPublished - 2023
EventTerahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVI 2023 - San Francisco, United States
Duration: 30 Jan 20231 Feb 2023

Conference

ConferenceTerahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVI 2023
Country/TerritoryUnited States
CitySan Francisco
Period30/01/202301/02/2023
SeriesProceedings of SPIE - The International Society for Optical Engineering
Volume12420
ISSN0277-786X

Keywords

  • Field emission
  • Image intensifier
  • Imaging
  • Metamaterial
  • Metasurface
  • Photomultiplier tube
  • Terahertz
  • THz

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