Abstract
In this work we propose an extension of the Simplified Bond-Hyperpolarizability Model (SBHM) to Terahertz range and for including some electronic nonlinear effects. Originally, this model was developed by Aspnes and his group some years ago for nonlinear optical excitations1. SBHM is a classical phenomenological description of the nonlinear response of the electrons along the bonds in a material. Originally, the mean contribution was considered only along the bonds but later a correction was done and transversal contribution also added to the calculation2. First proposed for surfaces, where reconstruction was neglected and later also adapted to bulk, SBHM has shown to be an acceptable model to describe nonlinear phenomena as for example second harmonic generation (SHG), sum frequency generation (SFG), difference frequency generation (DFG) third harmonic generation (THG) and recently in a previous work was shown that also describes accurately electric field induced optical second harmonic (EFISH) generation3.
© 2015 Optical Society of America
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