Detection of direct and indirect terahertz waves using a Nb-based superconducting tunnel junction

Author

Otani, Chiko ; Shibuya, Takayuki ; Ariyoshi, Seiichiro ; Sato, Hiromi ; Shimizu, Hirohiko M. ; Kawase, Kodo ; Nakano, Ran ; Taino, Tohru ; Myoren, Hiroaki ; Takada, Susumu

Author_Institution

IRIKEN, Saitama, Japan

Volume

1

fYear

2005

fDate

19-23 Sept. 2005

Firstpage

263

Abstract

We are developing a broadband THz detectors using Nb-based superconducting tunnel junctions. We found two components in a current signal for 1-2 THz pulse input. From the comparison of results obtained for the signals, the frequency response for the different size of STJs and the STJs fabricated on different substrate materials, we demonstrate that they correspond to photons absorbed with the superconductor electrode (referred as ´direct´ component) and phonons generated by photons absorbed with the substrate (refered as ´phonon-mediated´ component).

Keywords

frequency response; infrared detectors; niobium; superconducting junction devices; superconductive tunnelling; 1 to 2 THz; Nb; broadband THz detectors; direct terahertz wave; frequency response; indirect terahertz waves; photons absorbers; substrate materials; superconducting tunnel junction; superconductor electrode; superconductor phonons; terhertz wave detection; Biological materials; Biomedical materials; Detectors; Josephson junctions; Niobium; Phonons; Substrates; Superconducting epitaxial layers; Superconducting materials; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics, 2005. IRMMW-THz 2005. The Joint 30th International Conference on

Print_ISBN

0-7803-9348-1

Type

conf

DOI

10.1109/ICIMW.2005.1572509

Filename

1572509