摘要
Electric-dipole optical second harmonic generation(SHG)is a second-order nonlinear process that is widely used as a sensitive probe to detect broken inversion symmetry and local polar order.Analytical modeling of the SHG polarimetry of a nonlinear optical material is essential to extract its point group symmetry and the absolute nonlinear susceptibilities.Current literature on SHG analysis involves numerous approximations and a wide range of(in)accuracies.We have developed an open-source package called the Second Harmonic Analysis of Anisotropic Rotational Polarimetry(♯SHAARP.si)which derives analytical and numerical solutions of reflection SHG polarimetry from a single interface(.si)for bulk homogeneous crystals with arbitrary symmetry group,arbitrary crystal orientation,complex and anisotropic linear dielectric tensor with frequency dispersion,a general SHG tensor and arbitrary light polarization.♯SHAARP.si enables accurate modeling of polarimetry measurements in reflection geometry from highly absorbing crystals or wedge-shaped transparent crystals.The package is extendable to multiple interfaces.
基金
This development of the software was supported as part of the Computational Materials Sciences Program funded by the U.S.Department of Energy,Office of Science,Basic Energy Sciences,under Award No.DE-SC0020145
R.Z.,B.W.,J.-J.W.,L.-Q.C.,and V.G.were supported by the U.S.Department of Energy,Office of Science,Basic Energy Sciences,under Award No.DE-SC0020145
J.H.acknowledges support from National Science Foundation under NSF DMR-2210933
L.W.was supported by NSF Research Experiences for Undergraduates(REU),DMR 185-1987
Part of this work was performed under the auspices of the U.S.Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344(B.W.).
