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Proceedings Paper

Reflection-geometry sub-terahertz-wave imaging for biological materials using an integrated photonic transceiver
Author(s): Hiroshi Ito; Hiroshi Yamamoto; Yoshifumi Muramoto; Tadao Ishibashi
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Paper Abstract

A photonic transceiver module integrating a uni-traveling-carrier photodiode, a Schottky barrier diode, and a planar circulator circuit has been developed for sub-terahertz(THz)-wave reflection-geometry imaging. All the components are assembled in a compact rectangular-waveguide-output package for operation in the J-band (220 - 325 GHz), and continuous sub-THz waves are generated by the photomixing. The frequency dependence of the detection sensitivity of the transceiver module exhibits clear resonant behavior at around 270 GHz. The peak internal signal-to-background (S/B) ratio is measured to be as large as about 10. The characteristic of the fabricated transceiver is evaluated by measuring two-dimensional images of a test sample at frequencies from 240 to 310 GHz. Although the image resolution degrades with signal frequency deviation from the resonant condition due to the S/B ratio decrease, it is confirmed that a practical contrast can be obtained for a bandwidth of about 40 GHz even with an S/B ratio below one. Based on these results, the reflection-geometry in-vivo imaging of a human finger at 270 GHz is successfully demonstrated.

Paper Details

Date Published: 7 September 2011
PDF: 10 pages
Proc. SPIE 8119, Terahertz Emitters, Receivers, and Applications II, 811902 (7 September 2011); doi: 10.1117/12.892526
Show Author Affiliations
Hiroshi Ito, Kitasato Univ. (Japan)
Hiroshi Yamamoto, Kitasato Univ. (Japan)
Yoshifumi Muramoto, NTT Photonics Labs. (Japan)
Tadao Ishibashi, NTT Electronics Corp. (Japan)

Published in SPIE Proceedings Vol. 8119:
Terahertz Emitters, Receivers, and Applications II
Manijeh Razeghi; Nicolas Péré-Laperne; Henry O. Everitt; John M. Zavada; Tariq Manzur, Editor(s)

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