Ultrabroadband and Low-Dispersion Multiple-Joint Transmission-Line for Terahertz Region
- PDF / 1,611,680 Bytes
- 9 Pages / 439.37 x 666.142 pts Page_size
- 33 Downloads / 120 Views
Ultrabroadband and Low-Dispersion Multiple-Joint Transmission-Line for Terahertz Region Hideaki Kitahara 1 & Masanori Hangyo 1 & Masahiko Tani 2 Received: 13 January 2020 / Accepted: 13 April 2020/ # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract
A multiple-joint transmission line based on the principle of the periscope was developed to realize the flexible guidance of terahertz (THz) waves. The transmission line has a slightly larger diameter than the standard plastic hollow-pipe waveguide, sufficient stability, low transmission loss, ultrabroadband spectrum, and low dispersion. The transmission line is evaluated using a THz time-domain spectrometer consisting of reflective two-dimensional electro-optic sampling with a high-speed complementary metal-oxide semiconductor camera. Keywords Flexible transmission line . THz transmission line . Hollow-pipe waveguide . Twodimensional electro-optic sampling
1 Introduction Progress in terahertz (THz) technology has resulted in the development of various types of equipment. In this process, a transmission channel was also proposed to transport an emitted THz wave over a long distance with low transmission loss [1–20]. For example, the flexible transmission channel [21–44] has attracted the interest of researchers because of its anticipated use in medical applications such as harmless diagnosis equipment. Table 1 lists the rough classification of flexible transmission channels that have been proposed previously. These are fabricated using dielectrics or metals, and the electromagnetic wave propagates with various modes on these transmission channels that typically have a transmission loss of at least several decibels per meter. For low-power THz emitters, these transmission channels generally have Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10762-02000693-3) contains supplementary material, which is available to authorized users.
* Hideaki Kitahara kitahara–[email protected]–u.ac.jp
1
Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
2
Research Center for Development of Far-Infrared Region, University of Fukui, 3-9-1 Bunkyo Fukui, Fukui 910-8507, Japan
Journal of Infrared, Millimeter, and Terahertz Waves
too high a transmission loss to be used in a reflection measurement system. A transmission channel that is used for tomographic image acquisition with a pulse wave should have low dispersion over a wide range of the wavelengths to maintain time coherency. However, most of the proposed transmission channels do not have flat characteristics of spectrum and dispersion. Therefore, it is difficult to use these transmission channels in tomographic imaging applications using pulse waves in the current situation. Perhaps, the transmission channels that were previously proposed will actually become useful by improving the transmission loss and the spectrum characteristics. Until then, even if the channels are fabricated by the classical method with a slight
Data Loading...
