Transverse Optical Magnetism.

Nonlinear Optics;Physics;Science;Applied Physics

Fisher, WilliamNees, John A. ;

University of Michigan

关键词: Nonlinear Optics;    Physics;    Science;    Applied Physics;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/96137/wfisher_1.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

This thesis reports the first observations and theory of transverse magnetic response at optical frequencies under non-relativistic conditions.The nonlinear optical process responsible for magnetic dipole scattering is identified and analyzed with classical and quantum treatments.The intensity dependence of nonlinear magnetic dipole scattering is found to be quadratic in a centrosymmetric liquid, indicating that this must be a new nonlinear effect not described by traditional nonlinear optics.Contrary to standard treatments of non-relativistic, nonlinear optics, strong effects due to the optical magnetic field are predicted and verified experimentally.Saturation behavior of the magneto-electric response is measured in carbon tetrachloride, water, and benzene well below the threshold of relativistic optics and is shown to depend on their molecular structure.Magnetic saturation intensities of these three liquids are reported here for the first time.Several mutually consistent theoretical descriptions of Transverse Optical Magnetism are developed.The classical Lorentz Oscillator Model is extended to include Lorentz forces and the equations of motion are solved perturbatively to establish that second order dynamics result from their inclusion.It is found that the equations of motion support unstable motion and are expressible as a system of sinusoidally coupled Mathieu equations.Quantum mechanical theories based on the density matrix and Heisenberg formalisms are also presented.The quantum mechanical results agree quantitatively with the classical theory.Thus, a new class of nonlinear optical phenomena is uncovered, and in particular, magneto-electric optical rectification is foreseen.If used in the transient regime with pulsed sources this effect holds promise for generating intense terahertz radiation in unbiased dielectrics.This effect is also capable of producing a static voltage and analysis is presented showing that it may be useful for laser beam energy conversion or for solar power generation.With numerical modeling this interaction is shown to be robust enough to be potentially efficient even for incoherent light sources like the sun.