Terahertz imaging system using high-Tc superconducting oscillation devices

Tsujimoto, M., Minami, H., Delfanazari, K., Sawamura, M., Nakayama, R., Kitamura, T., Yamamoto, T., Kashiwagi, T., Hattori, T. and Kadowaki, K. (2012) Terahertz imaging system using high-Tc superconducting oscillation devices. Journal of Applied Physics, 111(12), 123111. (doi: 10.1063/1.4729799)

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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-Tc superconducting single crystalline Bi2Sr2CaCu2O8+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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Delfanazari, Dr Kaveh
Authors: Tsujimoto, M., Minami, H., Delfanazari, K., Sawamura, M., Nakayama, R., Kitamura, T., Yamamoto, T., Kashiwagi, T., Hattori, T., and Kadowaki, K.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Applied Physics
Publisher:AIP Publishing
ISSN:0021-8979
ISSN (Online):1089-7550
Published Online:22 June 2012

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