Design and Fabrication of a 1 THz Backward Wave Amplifier

Claudio Paoloni, Aldo Di Carlo, Francesca Brunetti, Mauro Mineo, Giacomo Ulisse, Alain Durand, Viktor Krozer, Mikko Kotiranta, Anna Maria Fiorello, Massimiliano Dispenza, Alberto Secchi, Vitaliy Zhurbenko, Faycal Bouamrane, Thomas Bouvet, Stephan Megtert, Emanuela Tamburri, Costel-Sorin Cojocaru, Aurelien Gohier

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    Abstract

    The THz frequency range represents a true challenge for designers, fabrication technologies and characterization systems. So far, huge technological obstacles have prohibited any system realization different from laboratory one. Furthermore, most of the applications in the THz frequency range require a level of power not achievable by optoelectronic devices at room temperature or by solid-state technology. The recent availability of three-dimensional simulators and high aspect ratio micro-fabrication techniques has stimulated a class of vacuum electron devices operating in the THz regime, to get a level of output power to enable applications at these frequencies. The OPTHER (Optically driven THz amplifier) project, funded by the European Community, is on the road to realize the first 1 THz vacuum tube amplifier. Technology at the state of the art has been used for the realization of the parts with dimensions supporting THz frequencies. A backward wave amplifier configuration is chosen to make the parts realizable. A carbon nanotube cold cathode has been considered for electron generation. A thermionic micro electron gun is designed to test the tube. A novel slow-wave structure (SWS), the double corrugated rectangular waveguide, is devised to support a cylindrical electron beam and to guarantee high interaction impedance with limited losses. Both LIGA and UV SU-8 photolithography have been tested to realize the SWS.
    Original languageEnglish
    JournalTerahertz Science & Technology
    Volume4
    Issue number4
    Pages (from-to)149-163
    ISSN1941-7411
    Publication statusPublished - 2011

    Bibliographical note

    Invited paper

    Keywords

    • Backward wave amplifier
    • Vacuum electron device
    • LIGA
    • Micromachining
    • Carbon nanotube
    • Terahertz

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