Physics Department Seminar
Dr. Jean-Michel Menard
Assistant Professor
Department of Physics, University of Ottawa
Tuesday, March 13, 2018

Ultrafast THz spectroscopy
Broadband electro‐optic detection of light in the infrared spectral range provides unique access to low‐energy microscopic dynamics. Fascinating physical phenomena in various materials can then be investigated with this optical technique also referred to as time-resolved terahertz (THz) spectroscopy. For example, this technique allows us to trace the matter component of a cooling exciton-polariton gas inside a semiconductor microcavity, and observe, for the first time, the build-up process leading to Bose-Einstein condensation in solid state. Our measurements establish a fundamental difference between polariton and photon lasing and open novel possibilities for coherent control of a macroscopic quantum sate. Recently, our lab has developed a range of new photonics tools that will push the limits of ultrafast THz spectroscopy. These techniques rely on the use of gas-filled hollow-core photonic crystal fibers and open a window of opportunity to investigate ultrafast excitations in matter occurring across to the full infrared region.