Condensed Matter

   

Complex Nonlinear Optics of Noncentrosymmetric Matter: Extended SBHM Model for Theoretical Describing of Nonlinear High-Order Harmonic Light Matter Interaction of Surfaces

Authors: Peter Krampl

In this work an improved Simplified bond hyperpolarizability model is presented, which until now has only been accessible experimentally and theoretically. The resulting surface spectra due to nonlinear material excitation are too imprecise and therefore an improved model formation is necessary in order to determine the surface signals exactly and to be able to separate them exactly from the surface signals, interface signals and bulk signals. For this purpose, a more powerful microscopic physical and mathematical model image for describing the SHG surface signals is shown, which is based on tensor or Fourier correction coefficients developed by standard phenomenological methods. For the first time, this model image provides analytical solutions for the pure nonlinear emission fields and nonlinear transmission fields, which are shown by way of example for the exact prediction of the SHG response at (111) Si-SiO2 interfaces, which by comparison with previous data from Aspnes et. al. has been verified. With these analytical expressions the nonlinear emission (intensity) of rotating crystals could be described. The developed mathematical expressions make it possible to solve nonlinear systems based on dipole, quadrupole, octapol ... approximations in a purely nonlinear manner, regardless of their previously not separable linear field components. Based on the experimentally obtained non-linear SBHM spectra, the results show that complete phase adjustment is the essential prerequisite for non-linear field propagation in condensed matter. The success of this improved formulation implies the improved description of SHG without unnecessarily complicating the simplicity of the initial model. This makes it possible to make SHG spectra accessible by simulation and to make reliable predictions of SHG responses and, in addition, even higher harmonics, subharmonics and ultra-harmonics of even order for surfaces and interfaces of any substance class. In addition, one can obtain spectra equations for bulk and interface surface - bulk of any order analogous to the model formation presented. In addition, the exact nonlinear field absorption N.Z.S. Matter described, which for Z.S. Matter can be obtained analogously.

Comments: 17 Pages.

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Submission history

[v1] 2019-04-18 18:28:12
[v2] 2019-12-24 08:33:13

Unique-IP document downloads: 88 times

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