CUED Publications database

Terahertz imaging system using high-T <inf>c</inf> superconducting oscillation devices

Tsujimoto, M and Minami, H and Delfanazari, K and Sawamura, M and Nakayama, R and Kitamura, T and Yamamoto, T and Kashiwagi, T and Hattori, T and Kadowaki, K (2012) Terahertz imaging system using high-T <inf>c</inf> superconducting oscillation devices. Journal of Applied Physics, 111. ISSN 0021-8979

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Abstract

Microwatt power oscillation devices at sub-terahertz frequency region between 0.3 and 1.0 terahertz (THz) were fabricated from high-T c superconducting single crystalline Bi 2Sr 2CaCu 2O 8+δ and used as a source of the transmission terahertz imaging system. As test examples, terahertz images of coins and a razor blade placed inside the brownish paper envelopes with the spatial resolution of 1 mm are presented. The signal-to-noise ratio exceeds 130 in these images. Using a simple wedge-shaped interferometer and analysing the interference fringe pattern, the wavelength of the terahertz wave is calibrated within 0.1% accuracy. This interferometer also provides a simple method to measure the absorption coefficient of the liquid sample. Two test measurements for distilled water and ethanol are demonstrated and their absorption coefficients are obtained with 99.2% accuracy. This suggests that our terahertz imaging system can be applied to many practical applications, such as biological and biomedical imaging, environmental monitoring, microanalysis of impurities, structure and dynamical analyses of large molecules and ions in solution. © 2012 American Institute of Physics.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:00
Last Modified: 19 Nov 2020 11:47
DOI: 10.1063/1.4729799