Colloquium- Jeff Moses (Cornell)- The nonlinear lattice polarizability: where nonlinear optics and structural control meet

Jeff Moses smiling with blurred background

November 19, 2024

3:45PM - 4:45PM

1080 Physics Research Building

Add to Calendar 2024-11-19 15:45:00 2024-11-19 16:45:00 Colloquium- Jeff Moses (Cornell)- The nonlinear lattice polarizability: where nonlinear optics and structural control meet Professor Jeff MosesCornell UniversityThe nonlinear lattice polarizability: where nonlinear optics and structural control meetLocation: 1080 Physics Research BuildingFaculty Host: Michael Chini Abstract: Light-driven coherent phonon coupling has become a new tool for investigation in materials physics as a way to produce significant quasi-static strain to a crystalline lattice, in turn enabling a route for controlling electronic and magnetic material order via ultrafast laser light. The interest in phonon coupling also includes the optical domain, as optical observables can be used to detect properties of a driven lattice, and resonantly driven phonons can offer a source of strong optical nonlinearity.The topic of this talk will be two-fold. First, I will discuss an overlooked pathway for light-driven coherent phonon coupling, the nonlinear lattice polarizability, that offers new capabilities both for achieving quasi-static lattice strain and giant optical nonlinearity. This polarizability, which underlies an ionic-dipole-mediated Raman scattering process, was predicted by both Raman and Herzberg many years ago, and has new relevance. Second, I will pivot to a method we are developing for creating the light pulses to use to explore light-matter interactions involving coherent phonon coupling, mid-infrared light of high field strength and few-picosecond duration. This method involves overcoming the usual quantum-efficiency limitation of a parametric amplifier through the hybridization of multiple phase-matched nonlinear optical processes. Bio: Jeff Moses is Director of Graduate Studies and Associate Professor of Applied & Engineering Physics at Cornell University, where he has led the Ultrafast Phenomena and Technologies Group since 2014. Prior to that he was a research scientist at the Research Laboratory of Electronics, MIT. He has received the US National Science Foundation CAREER award and was an AFOSR Young Investigator. His interests include following ultrafast dynamics in photo-excited systems, developing technologies for or based on ultrafast optical science, and nonlinear optics, generally. 1080 Physics Research Building OSU ASC Drupal 8 ascwebservices@osu.edu America/New_York public

2024-11-19 15:45:00 2024-11-19 16:45:00 Colloquium- Jeff Moses (Cornell)- The nonlinear lattice polarizability: where nonlinear optics and structural control meet Professor Jeff MosesCornell UniversityThe nonlinear lattice polarizability: where nonlinear optics and structural control meetLocation: 1080 Physics Research BuildingFaculty Host: Michael Chini Abstract: Light-driven coherent phonon coupling has become a new tool for investigation in materials physics as a way to produce significant quasi-static strain to a crystalline lattice, in turn enabling a route for controlling electronic and magnetic material order via ultrafast laser light. The interest in phonon coupling also includes the optical domain, as optical observables can be used to detect properties of a driven lattice, and resonantly driven phonons can offer a source of strong optical nonlinearity.The topic of this talk will be two-fold. First, I will discuss an overlooked pathway for light-driven coherent phonon coupling, the nonlinear lattice polarizability, that offers new capabilities both for achieving quasi-static lattice strain and giant optical nonlinearity. This polarizability, which underlies an ionic-dipole-mediated Raman scattering process, was predicted by both Raman and Herzberg many years ago, and has new relevance. Second, I will pivot to a method we are developing for creating the light pulses to use to explore light-matter interactions involving coherent phonon coupling, mid-infrared light of high field strength and few-picosecond duration. This method involves overcoming the usual quantum-efficiency limitation of a parametric amplifier through the hybridization of multiple phase-matched nonlinear optical processes. Bio: Jeff Moses is Director of Graduate Studies and Associate Professor of Applied & Engineering Physics at Cornell University, where he has led the Ultrafast Phenomena and Technologies Group since 2014. Prior to that he was a research scientist at the Research Laboratory of Electronics, MIT. He has received the US National Science Foundation CAREER award and was an AFOSR Young Investigator. His interests include following ultrafast dynamics in photo-excited systems, developing technologies for or based on ultrafast optical science, and nonlinear optics, generally. 1080 Physics Research Building America/New_York public

Professor Jeff Moses

Cornell University

The nonlinear lattice polarizability: where nonlinear optics and structural control meet

Location: 1080 Physics Research Building

Faculty Host: Michael Chini

Abstract: Light-driven coherent phonon coupling has become a new tool for investigation in materials physics as a way to produce significant quasi-static strain to a crystalline lattice, in turn enabling a route for controlling electronic and magnetic material order via ultrafast laser light. The interest in phonon coupling also includes the optical domain, as optical observables can be used to detect properties of a driven lattice, and resonantly driven phonons can offer a source of strong optical nonlinearity.

The topic of this talk will be two-fold. First, I will discuss an overlooked pathway for light-driven coherent phonon coupling, the nonlinear lattice polarizability, that offers new capabilities both for achieving quasi-static lattice strain and giant optical nonlinearity. This polarizability, which underlies an ionic-dipole-mediated Raman scattering process, was predicted by both Raman and Herzberg many years ago, and has new relevance. Second, I will pivot to a method we are developing for creating the light pulses to use to explore light-matter interactions involving coherent phonon coupling, mid-infrared light of high field strength and few-picosecond duration. This method involves overcoming the usual quantum-efficiency limitation of a parametric amplifier through the hybridization of multiple phase-matched nonlinear optical processes.

Bio: Jeff Moses is Director of Graduate Studies and Associate Professor of Applied & Engineering Physics at Cornell University, where he has led the Ultrafast Phenomena and Technologies Group since 2014. Prior to that he was a research scientist at the Research Laboratory of Electronics, MIT. He has received the US National Science Foundation CAREER award and was an AFOSR Young Investigator. His interests include following ultrafast dynamics in photo-excited systems, developing technologies for or based on ultrafast optical science, and nonlinear optics, generally.