Giant Enhancement of Surface Second Harmonic Generation in BaTiO_3 due to Photorefractive Surface Wave Excitation

TL;DR

This paper reports a significant enhancement of surface second harmonic generation in BaTiO_3 caused by photorefractive surface wave excitation, with potential applications in nonlinear surface spectroscopy.

Contribution

It demonstrates a novel mechanism for strongly enhancing surface SHG in BaTiO_3 through photorefractive surface wave excitation, with detailed analysis of dependencies.

Findings

Surface SHG intensity can reach 10^{-2} of incident light.

Angular, crystal orientation, and polarization dependencies are characterized.

Potential for advanced nonlinear surface spectroscopy applications.

Abstract

We report observation of strongly enhanced surface SHG in BaTiO_3 due to excitation of a photorefractive surface electromagnetic wave. Surface SH intensity may reach 10^{-2} of the incident fundamental light intensity. Angular, crystal orientation and polarization dependencies of this SHG are presented. Possible applications of this effect in nonlinear surface spectroscopy are discussed.