OSE Seminar by Dr. Denis Seletskiy on Ultrabroadband terahertz technologies

Departmental News

Denis Seletskiy

Posted: March 3, 2023

Speaker: OSE Alumnus, Dr. Denis Seletskiy, Polytechnique Montréal  

Date: Thursday, March 9, 2023 

Time:  12:15 PM - 1:15 PM

Location: PAIS, Room 2540 & Zoom

Terahertz (THz) spectral band is particularly attractive for studies of low-energy fundamental excitations in the solid state, with many derived applications. Much of the progress in THz technologies is driven by parallel developments in mode-locked lasers. Starting with a review of the recent advances in low-energy femtosecond laser sources, I will focus on several THz generation and detection techniques. First, using second-order nonlinearity (linear Pockels effect), I will show how few-cycle pulses generated directly out of a fiber laser can be used to generate and detect THz waveforms spanning from 1 to 100 THz, also extending into the near-infrared and visible bands. In addition, I will highlight our recent work on improving spintronic THz emitters and a demonstration of THz detection using third-order nonlinearity. This combined progress promises novel applications in high-resolution sensing and field-resolved integrated photonics.


Denis Seletskiy is an Associate Professor of Engineering Physics and a holder of Canada Research Chair (Tier 2) in "Ultrafast and Quantum Photonics" at Polytechnique Montréal (Canada). He received his PhD from the Optical Sciences and Engineering program at the University of New Mexico in 2010, followed by a National Research Council postdoctoral fellowship at Air Force Research Laboratories (2010-2012) and a 5-year junior group leader position and Marie Curie Zukuntskolleg Research fellowship at the University of Konstanz, Germany. In 2017 Seletskiy established the femtoQ laboratory at Polytechnique, which is focused on advancing theory, laser technology, and metrology protocols for time-domain quantum photonics. Since October 2022, he is leading an EU-CAN consortium in Mid-Infrared Quantum Technologies for Sensing (MIRAQLS).