English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A comprehensive analysis of second harmonic generation (SHG) in a diatomiczincblende crystal based on the Simplified Bond Hyperpolarizability Model(SBHM), Group Theory (GT) is presented. The third rank tensor between the twoapproaches are compared and applied to reproduce rotational anisotropy (RA) SHGexperimental result.It is well known that such a crystal is noncentrosymmetric,therefore the second harmonic generation source is dominated by bulk dipoleswith a SHG polarization $P_{BD}=\chi_{ijk}^{(2)}E(\omega)E(\omega)$. We showthat the SBHM previously applied to mono crystal system such as Silicon canalso be applied to an atomic cell containing two different atoms e.g. GaAs byintroducing an effective hyperpolarizability$\alpha_{2GaAs}=\left(\alpha_{2Ga}-\alpha_{2As}\right)$ . Comparison with GTyields the same third rank tensor for a $T_d$ point group corresponding to bulktetrahedral structure. Interestingly, SBHM gives good agreement with RASHGexperiment of GaAs using only one single fitting parameter when Fresnelanalysis is also incorporated in the model.

Bond Model and Group Theory of Second Harmonic Generation in GaAs(001)