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    Terahertz Sources Based on Time-Dependent Metasurfaces

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    Type
    Conference Paper
    Authors
    Tunesi, J.
    Peters, L.
    Gongora, J. S. Totero
    Olivieri, L.
    Fratalocchi, Andrea cc
    Pasquazi, A.
    Peccianti, M.
    KAUST Department
    Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division
    Electrical and Computer Engineering Program
    PRIMALIGHT Research Group
    Date
    2021-09-30
    Online Publication Date
    2021-09-30
    Print Publication Date
    2021-06-21
    Permanent link to this record
    http://hdl.handle.net/10754/672126
    
    Metadata
    Show full item record
    Abstract
    Novel metamaterial platforms exhibiting time-dependent electromagnetic properties enable the investigation of previously unexplored light-matter interactions [1] - [2] . A variation in the dielectric function on a timescale shorter than the electric field period is perceived as an ultrafast temporal boundary [3] , thus resulting in a time-dependent "Snell’s law" which connects the polarisation field frequency before and after the transition [4] , [5] . The onset of a frequency shift therefore enables the engineering of exotic nonlinear phenomena such as time refraction and photon acceleration [5] - [7] , with key fundamental and practical implications [8] . In one scheme, a temporal boundary is induced via photoexcitation of semiconducting metamaterials excited by ultrashort optical pulses. Above-bandgap photons drive an ultrafast transition from a dielectric to a metallic state. Temporal-boundaries-mediated nonlinearities become relevant for transition times shorter than the wave-period timescale, a challenging regime in optics. This condition is achieved in a hybrid approach, exploiting the interaction of terahertz (THz) fields and ultrafast photo-excited transients. The peculiar advantage of THz Time-Domain-Spectroscopy techniques is that they allow the agile reconstruction of full-field dynamics with sub-wave-period resolution. In addition, in all the considered schemes, terahertz waves impinge from vacuum onto a positionally static transient, in other words a large velocity mismatch always exists. An unexplored physical scenario is then when the transient is applied directly to a source where the transient exists in the same positional reference as the THz wave.
    Citation
    Tunesi, J., Peters, L., Totero Gongora, J. S., Olivieri, L., Fratalocchi, A., Pasquazi, A., & Peccianti, M. (2021). Terahertz Sources Based on Time-Dependent Metasurfaces. 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). doi:10.1109/cleo/europe-eqec52157.2021.9542223
    Publisher
    IEEE
    Conference/Event name
    2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
    ISBN
    978-1-6654-4804-8
    DOI
    10.1109/CLEO/Europe-EQEC52157.2021.9542223
    Additional Links
    https://ieeexplore.ieee.org/document/9542223/
    https://ieeexplore.ieee.org/document/9542223/
    https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9542223
    ae974a485f413a2113503eed53cd6c53
    10.1109/CLEO/Europe-EQEC52157.2021.9542223
    Scopus Count
    Collections
    Conference Papers; PRIMALIGHT Research Group; Electrical and Computer Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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