Towards Enhanced THz Radiation-Matter Interactions

I will review my research on THz nonlinear spectroscopy and THz nanoplasmonics. In the first part of my presentation, I will describe the high-energy THz source we have developed at INRS-EMT, and present some of the first ultrafast nonlinear experiments ever performed at THz frequencies. Then, I will proceed to introduce the concept and the practical implementation of metallic nanoantennas resonating at THz frequencies, describing the peculiar near-field and far-field properties of these nanostructures. THz nanoantennas can pave the way for terahertz few-molecule spectroscopy and terahertz nonlinear experiments at the nanoscale.