The paper is about the all-optical devices allowing transfer of information from the optical spectral band to the THz one: opto-THz switches, modulators and phase-shifters. The experiments were performed on a semi-insulating GaAs sample using an optical pump-THz probe scheme. The amplitude of the THz wave reflected on the structure under investigation is closely related to the phase change. The wave exhibits a /spl pi//2-shift upon reflection under antireflecting conditions and a change of the sign (/spl pi/-shift) in high-reflectivity regime. The proposed structure acts as an optically controlled THz switch or as a phase shifter.


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    Title :

    Active optical control of reflectivity in the terahertz range


    Contributors:
    Fekete, L. (author) / Kadlec, F. (author) / Kuzel, P. (author) / Mounaix, P. (author)


    Publication date :

    2005-01-01


    Size :

    216984 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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