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Proceedings Paper

Terahertz asymmetric quantum well infrared photodetector design based on electromagnetically induced transparency
Author(s): A. Rostami; M. Zyaei; H. Rasooli Saghai; F. J. Sharifi
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Paper Abstract

A new Terahertz photodetector based on Electromagnetically Induced Transparency (EIT) is proposed. In the terahertz range (low energy signal) the limiting point is dark current. Dark current determines the signal-noise ratio of detectors. Our main purpose in terahertz detection is reduction of the dark current which is done by converting the incoming Terahertz IR signal to short-wavelength or visible probe optical field through EIT phenomena. For realization of this idea, we used 4-level atoms which can be implemented by quantum wells or dots. In the proposed structure, the terahertz-IR signal does not interact directly with ground state electrons, but affects the absorption characteristics of the short-wavelength or visible probe optical field that directly interact with ground state electrons. Therefore, in the proposed structure, the important thermionic dark current in terahertz detection, can be strongly reduced.

Paper Details

Date Published: 17 November 2008
PDF: 9 pages
Proc. SPIE 7266, Optomechatronic Technologies 2008, 72660Z (17 November 2008); doi: 10.1117/12.804409
Show Author Affiliations
A. Rostami, Univ. of Tabriz (Iran, Islamic Republic of)
M. Zyaei, Islamic Azad Univ. (Iran, Islamic Republic of)
H. Rasooli Saghai, Univ. of Tabriz (Iran, Islamic Republic of)
Islamic Azad Univ. of Tabriz (Iran, Islamic Republic of)
F. J. Sharifi, Ryerson Univ. (Canada)

Published in SPIE Proceedings Vol. 7266:
Optomechatronic Technologies 2008

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