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.

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Issue

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

Article ID

SPP2013-1A-5

Section

Photonics, Terahertz, and Nanotechnology

Published

2013-10-23

How to Cite

[1]

S Tsuzuki, D Takeshima, T Nagase, S Ozawa, T Joja, T Furuya, K Kurihara, K Yamamoto, F Kuwashima, MI Bakunov, and M Tani, Enhancement of EO sampling sensitivity for THz waves by using super-focusing effect in metallic parallel plate waveguide, Proceedings of the Samahang Pisika ng Pilipinas 31, SPP2013-1A-5 (2013). URL: https://proceedings.spp-online.org/article/view/SPP2013-1A-5.