MURI Center for Dynamic Magneto-Optics (DYNAMO)
Abstract
The MURI Center for Dynamic Magneto-Optics (DYNAMO) was established to investigate magneto-electric phenomena at the molecular level and to evaluate their possible utility for energy conversion. While M-E processes are well-known in bulk magnetic material, and have been studied for energy conversion and sensor technology, magneto-electric rectification, magnetization and harmonic generation at the molecular level in non-magnetic materials have not previously been investigated in any detail. The three nonlinear optical phenomena at the core of this program depend uniquely on the magnetic (Lorentz) force of light under non-relativistic conditions (i.e. at intensities < 1018 W/cm2). Dynamic magneto-optic effects are expected to be negligible at low intensities, but it was found that parametric resonance and the exchange of orbital and rotational angular momenta can intensify nonlinearities mediated by the optical Lorentz force at non-relativisticintensities. Torque enhancement was confirmed experimentally in spectra of magneto-electrically scattered light that contained rotational features, confirming the importance of librational motion and low libration frequencies in magneto-electric transitions at the molecular level. The program also developed three different analytic approaches to understand charge separation, magnetization, and harmonic generation: a classical torque model, an exact dressed state analysis, and a density matrix treatment which displayed the dependences of M-E processes on transition moments, detuning, relaxation rates, intensity, and polarization.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 08, 2020
- Accession Number
- AD1103099
Entities
People
- Stephen C. Rand
- Tobin J. Marks
Organizations
- Board of Regents of the University of Michigan