Summary form only given. We describe the apparent superluminal behavior of the interference pattern in front of an axicon lens using terahertz spectroscopy. The ability to coherently detect the electric field permits a more complete characterization of this Bessel beam than has been previously reported. We report direct observations of superluminal phase and group velocities, both of which are only weak functions of frequency. As a result, it is possible to discount pulse reshaping effects in the consideration of experiments of this type. We also expect that the extended Rayleigh range of these Bessel beams should be useful for enhanced depth-of-field terahertz imaging.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Characterization of apparent superluminal effects in terahertz Bessel beams


    Contributors:
    Lloyd, J. (author) / Mittleman, D. (author)


    Publication date :

    2002-01-01


    Size :

    132407 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




    Unraveling Bessel Beams

    Dudley, A. / Lavery, M. / Padgett, M. et al. | British Library Online Contents | 2013


    Ultrafast optics Measurement of the Spatiotemporal Electric Field of Ultrashort Superluminal Bessel-X Pulses

    Bowlan, P. / Valtna-Lukner, H. / Lohmus, M. et al. | British Library Online Contents | 2009


    Superluminal propagation of terahertz pulses in sub-wavelength structures

    Wynne, K. / Carey, J.C. / Zawadzka, J. et al. | IEEE | 1999


    Creation of generalized spiraling bessel beams by fresnel diffraction of Bessel–Gaussian laser beams

    El Halba, E. M. / Ez-zariy, L. / Belafhal, A. | British Library Online Contents | 2017