Paper 13139-20
Paper 13139-20
Saturable second harmonic generation in 2D polar metal heterostructures (Invited Paper)
19 August 2024 • 9:15 AM - 9:40 AM PDT | Conv. Ctr. Room 11B
Abstract
In this presentation, I will describe recent advances in using ultrafast coherent multi-dimensional nonlinear optical microscopy to identify resonant electronic excitations in 2D metals. I will demonstrate that resonance matching at harmonic wavelengths results in a population inversion, which in turn saturates SHG transduction. Numerical modeling shows that internal energy transfer on sub-cycle timescales (< 2fs) mediates the population inversion. These effects are determined by atomic-level structure of the 2D metal.
Presenter
The Pennsylvania State Univ. (United States)
Kenneth L. Knappenberger, Jr. is a Professor of Chemistry at The Pennsylvania State University where he leads a research effort focused on development and use of laser spectroscopy methods for understanding electronic carrier dynamics nonlinear optical phenomena in condensed-phase materials. He was a postdoctoral researcher at University of California, Berkeley (2005-2008) and earned his PhD at The Pennsylvania State University in 2005. He started his independent career at Florida State University (2008−2017). He moved to Penn State as Professor of Chemistry in 2017. He is recipient of the Coblentz Award in Spectroscopy and is an elected fellow of the American Association for the Advancement of Science.