Speaker : Prof. Ksenia Dolgaleva (University of Ottawa)

Date and time : Monday, March 10, 1:00 p.m. to 1:45 p.m. (Eastern time)

To attend or to get access to the recording of this seminar, please contact the program coordinator (genevieve.boudreau@inrs.ca).

Title : Nonlinear Optical Response of Solids at the THz Frequencies

The introduction of intense THz sources with electric field peak values as large as 1 MV/cm using optical rectification in LiNbO3 has made the study of the nonlinear behaviour of materials in the THz frequency range possible. The high-intensity THz fields cause strong effects such as impact ionisation and intervalley scattering in semiconductors. Thus, it can be used to study the carrier dynamics in semiconductors and consequently to develop the nonlinear terahertz metamaterials by manipulating the carrier dynamics in semiconductors.

Furthermore, the vibrational modes of the majority of solids and large molecules lie in THz spectrum range. The coupling between the intense THz field and these vibrational modes gives valuable information about the light matter interactions in this frequency range. Moreover, thanks to the strong THz-phonon couplings, intense THz pulses induce strong nonlinear responses in solids and liquids. In this presentation, we report the results of our recent theoretical and experimental studies on the nonlinear refractive index is solids at the THz frequency range, and it dispersion.

For the full seminar series, visit : ultrafast-coast-to-coast.ca.

See you there!