THz emission from quantum dot-based THz antennas pumped by a tunable quantum-dot laser diode

R. Leyman, D. Carnegie, K. A. Fedorova, N. Bazieva, S. Schulz, C. Reardon, E. Clarke, E. U. Rafailov

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    6 Citations (Scopus)

    Abstract

    The THz optoelectronics field is now maturing and semiconductor-based THz antenna devices are becoming more widely implemented as analytical tools in spectroscopy and imaging. Photoconductive (PC) THz switches/antennas are driven optically typically using either an ultrashort-pulse laser or an optical signal composed of two simultaneous longitudinal wavelengths which are beat together in the PC material at a THz difference frequency. This allows the generation of (photo)carrier pairs which are then captured over ultrashort timescales usually by defects and trapping sites throughout the active material lattice. Defect-implanted PC materials with relatively high bandgap energy are typically used and many parameters such as carrier mobility and PC gain are greatly compromised. This paper demonstrates the implementation of low bandgap energy InAs quantum dots (QDs) embedded in standard crystalline GaAs as both the PC medium and the ultrafast capture mechanism in a PC THz antenna. This semiconductor structure is grown using standard MBE methods and allows the device to be optically driven efficiently at wavelengths up to ~1.3 µm, in this case by a single tunable dual-mode QD diode laser.
    Original languageEnglish
    Title of host publication2013 Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference
    Place of PublicationPiscataway, NJ.
    PublisherIEEE
    ISBN (Print)9781479905935
    DOIs
    Publication statusPublished - 2013
    Event2013 Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference - ICM Congress Centre, Munich, Germany
    Duration: 12 May 201316 May 2013

    Conference

    Conference2013 Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference
    Abbreviated titleCLEO/Europe - IQEC 2013
    CountryGermany
    CityMunich
    Period12/05/1316/05/13

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