PhD student · Started in 2023
Olesia PASHINA
Light induced transient photonic structures
CurriculumTelecommunication Engineering
AdvisorCostantino De Angelis
Research groupTo be confirmed
This research explores light-induced transient photonic structures for ultrafast and reversible control of linear and nonlinear optical responses in semiconductor films and metasurfaces. Spatially patterned femtosecond excitation generates nonequilibrium carriers, creating transient permittivity landscapes and photo-Dember fields on subpicosecond timescales. These effects enable ultrafast resonance switching, beam steering, surface-mode coupling, second-harmonic generation, and optically induced EFISH. The work integrates carrier-transport and relaxation modelling with electromagnetic simulations of initially homogeneous semiconductor media and high-Q resonant metasurfaces. The ultimate goal is to develop fabrication-free and dynamically reconfigurable platforms for nonlinear nanophotonics, integrated photonics, telecommunications, and optical information processing.
Other advisors: Mihail Petrov
Profile
Short Bio
Olesya Pashina is a third-year PhD student at University of Brescia specializing in nonlinear nanophotonics, thermo-optical effects, harmonic generation, high-Q resonant states, and ultrafast light–matter interactions in semiconductor structures. Her research combines theoretical and numerical modelling of photoexcited-carrier dynamics with simulations of transient permittivity modulation, second-harmonic generation, and resonant metasurfaces. She has authored or co-authored more than 20 publications in leading journals, including Light: Science & Applications, Physical Review Applied, Laser & Photonics Reviews, ACS Photonics, Nanophotonics, Nano Letters, Optics Express, and Optics Letters.
