Enhancement of EO sampling sensitivity for THz waves by using super-focusing effect in metallic parallel plate waveguide

Authors

  • Satoshi Tsuzuki Research Center for Development of Far-Infrared Region, University of Fukui
  • Daiki Takeshima Research Center for Development of Far-Infrared Region, University of Fukui
  • Tomohiro Nagase Research Center for Development of Far-Infrared Region, University of Fukui
  • Shinpei Ozawa Research Center for Development of Far-Infrared Region, University of Fukui
  • Tatsuya Joja Research Center for Development of Far-Infrared Region, University of Fukui
  • Takashi Furuya Research Center for Development of Far-Infrared Region, University of Fukui
  • Kazuyoshi Kurihara Faculty of Education and Regional Studies, University of Fukui
  • Kohji Yamamoto Research Center for Development of Far-Infrared Region, University of Fukui
  • Fumiyoshi Kuwashima Department of Electrical, Electric and Computer Engineering, Fukui University of Technology
  • Michael I. Bakunov Department of General Physics, University of Nizhny Novgorod
  • Masahiko Tani Research Center for Development of Far-Infrared Region, University of Fukui

Abstract

We have succeeded in enhancing the sensitivity of electro-optic (EO) sampling for terahertz (THz) waves by using a metallic parallel plate waveguide structure. The EO sampling signal is proportional to the incident THz electric field on the EO crystal. However, focusing of THz electric field by ordinary optics, such as lenses, is limited by the diffraction effect. In this research, we use a tapered metallic parallel plate waveguide (V-groove waveguide) to collect and focus THz waves into the sub-wavelength gap of a parallel plate. Furthermore, by using a thin EO crystal (LiNbO3 crystal) attached to the end of the metallic waveguide structure, we have suppressed diffraction effects. As the result we achieved about 20 times enhancement of total EO sampling signal compared to the case without the metallic waveguide structure.

Proceedings SPP 2013 Cover

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Published

2013-10-23

Issue

2013: Proceedings of the 31st Samahang Pisika ng Pilipinas Physics Congress

Section

Photonics, Terahertz, and Nanotechnology

License

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All other associated economic and moral rights as granted by the Intellectual Property Code of the Philippines are maintained by the Authors.

How to Cite

[1]
“Enhancement of EO sampling sensitivity for THz waves by using super-focusing effect in metallic parallel plate waveguide”, Proc. SPP, vol. 31, no. 1, pp. SPP2013–1A, Oct. 2013, Accessed: Mar. 25, 2026. [Online]. Available: https://proceedings.spp-online.org/article/view/SPP2013-1A-5