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Applied Physics Letters / Volume 98 / Issue 12 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 98, 121107 (2011); http://dx.doi.org/10.1063/1.3571289 (3 pages)

Terahertz-frequency photoconductive detectors fabricated from metal-organic chemical vapor deposition-grown Fe-doped InGaAs

O. Hatem1, J. Cunningham1, E. H. Linfield1, C. D. Wood1, A. G. Davies1, P. J. Cannard2, M. J. Robertson2, and D. G. Moodie2

1School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom
2CIP Technologies, Adastral Park, Martlesham Heath, Ipswich, Suffolk IP5 3RE, United Kingdom

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(Received 13 January 2011; accepted 7 March 2011; published online 23 March 2011)

We report the detection of terahertz frequency radiation using photoconductive antennas fabricated from Fe-doped InGaAs, grown by metal-organic chemical vapor deposition. Coherent photoconductive detection is demonstrated using femtosecond laser pulses centered at either an 800 or a 1550 nm wavelength. The InGaAs resistivity and the sensitivity of photoconductive detection are both found to depend on the Fe-doping level. We investigate a wide range of probe laser powers, finding a peak in detected signal for ∼ 5 mW probe power, followed by a reduction at larger powers, attributed to screening of the detected THz field by photo-generated carriers in the material. The measured signal from Fe:InGaAs photoconductive detectors excited at 800 nm is four times greater than that from a low-temperature-grown GaAs photodetector with identical antenna design, despite the use of a ten times smaller probe power.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

antennas, doping profiles, electrical resistivity, gallium arsenide, high-speed optical techniques, III-V semiconductors, indium compounds, iron, MOCVD, photoconducting devices, photodetectors, semiconductor doping, semiconductor growth, semiconductor thin films, terahertz wave detectors

PACS

  • 85.60.Gz

    Photodetectors (including infrared and CCD detectors)

  • 84.40.Ba

    Antennas: theory, components and accessories

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3571289

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    Y. C. Shen, P. C. Upadhya, E. H. Linfield, H. E. Beere, and A. G. Davies, Appl. Phys. Lett. 83, 3117 (2003)APPLAB000083000015003117000001.

    A. Takazato, M. Kamakura, T. Matsui, J. Kitagawa, and Y. Kadoya, Appl. Phys. Lett. 91, 011102 (2007)APPLAB000091000001011102000001.

    M. Suzuki and M. Tonouchi, Appl. Phys. Lett. 86, 051104 (2005)APPLAB000086000005051104000001.

    M. Suzuki and M. Tonouchi, Appl. Phys. Lett. 86, 163504 (2005)APPLAB000086000016163504000001.

    C. D. Wood, O. Hatem, J. E. Cunningham, E. H. Linfield, A. G. Davies, P. J. Cannard, M. J. Robertson, and D. G. Moodie, Appl. Phys. Lett. 96, 194104 (2010)APPLAB000096000019194104000001.

    C. Ludwig and J. Kuhl, Appl. Phys. Lett. 69, 1194 (1996)APPLAB000069000009001194000001.


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