Giving to CREOL CREOL, The College of Optics & Photonics

Seminar: "Generation of rotations and charge separation with magneto-electric nonlinearities" by Tuan Trinh

Tuesday, August 28, 2018 12:00 PM to 1:00 PM
CREOL Room 103

Tuan Trinh
University of Michigan


The control of the magnetic properties of materials by ultrafast optical field enable novel sensing technology, energy conversion, terahertz emission, and ultrafast data storage. However, the interaction of the magnetic field of light with materials is normally ignored due to low magnetic susceptibilities at high frequencies. Optical nonlinearities driven jointly by electric and magnetic field components of light provide a new route in controlling magnetic properties of bulk media. Strong coupling of electric and magnetic field driven motions can result in the enhancement of magnetic dipole moments in homogeneous media. Several novel physical phenomena arise from curved motion of bound electrons driven jointly by electric and magnetic fields. Such as longitudinally polarized second harmonic radiation, induced transverse magnetization at the optical frequency, and charge separation along the propagation direction. Here, I will present the first observation of optical magnetic torque induced molecular rotations that leads to an enhancement of optical magnetization for a series of tetrahedral molecules via light scattering experiment. In addition, I will give a brief discussion on the magneto-electric charge separation in pentacene semiconductor using time-resolved electric field induced second harmonic generation. 

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David Hagan

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