Type
Conference PaperAuthors
Tunesi, J.Peters, L.
Gongora, J. S. Totero
Olivieri, L.
Fratalocchi, Andrea

Pasquazi, A.
Peccianti, M.
KAUST Department
Computer, Electrical and Mathematical Science and Engineering (CEMSE) DivisionElectrical and Computer Engineering Program
PRIMALIGHT Research Group
Date
2021-09-30Online Publication Date
2021-09-30Print Publication Date
2021-06-21Permanent link to this record
http://hdl.handle.net/10754/672126
Metadata
Show full item recordAbstract
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-eqec52157.2021.9542223Publisher
IEEEConference/Event name
2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)ISBN
978-1-6654-4804-8Additional 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