Optical second harmonic generation in anisotropic multilayers with complete multireflection of linear and nonlinear waves using♯SHAARP.ml package  

作　　者：Rui Zu Bo Wang Jingyang He Lincoln Weber Akash Saha Long-Qing Chen Venkatraman Gopalan 

机构地区：[1]Department of Materials Science and Engineering,The Pennsylvania State University,University Park,PA 16802,USA [2]Materials Science Division,Lawrence Livermore National Laboratory,Livermore,CA 94550,USA [3]Department of Engineering Science and Mechanics,The Pennsylvania State University,University Park,PA 16802,USA [4]Department of Mathematics,The Pennsylvania State University,University Park,PA 16802,USA [5]Department of Physics,Pennsylvania State University,University Park,PA 16802,USA

出　　处：《npj Computational Materials》2024年第1期2566-2580,共15页计算材料学(英文)

基　　金：supported by the US Department of Energy,Office of Science,Basic Energy Sciences,under Award Number DE-SC0020145 as part of the Computational Materials Sciences Program;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;supported by NSF Research Experiences for Undergraduates(REU),DMR-1851987;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.);R.Z.also received support from the NSF MRSEC Center for Nanoscale Science,DMR-2011839,for optical characterizations;funded by the U.S.Department of Energy(DOE),Office of Science,Basic Energy Sciences under Award Number DE-SC0021118,for the new materials development.

摘　　要：Optical second harmonic generation(SHG)is a nonlinear optical effect widely used for nonlinear optical microscopy and laser frequency conversion.Closed-form analytical solution of the nonlinear optical responses is essential for evaluating materials whose optical properties are unknown a priori.A recent open-source code,♯SHAARP.si,can provide such closed form solutions for crystals with arbitrary symmetries,orientations,and anisotropic properties at a single interface.However,optical components are often in the form of slabs,thin films on substrates,and multilayer heterostructures with multiple reflections of both the fundamental and up to ten different SHG waves at each interface,adding significant complexity.Many approximations have therefore been employed in the existing analytical approaches,such as slowly varying approximation,weak reflection of the nonlinear polarization,transparent medium,high crystallographic symmetry,Kleinman symmetry,easy crystal orientation along a high-symmetry direction,phase matching conditions and negligible interference among nonlinear waves,which may lead to large errors in the reported material properties.To avoid these approximations,we have developed an open-source package named Second Harmonic Analysis of Anisotropic Rotational Polarimetry in Multilayers(♯SHAARP.ml).The reliability and accuracy are established by experimentally benchmarking with both the SHG polarimetry and Maker fringes using standard and commonly used nonlinear optical materials as well as twisted 2-dimensional heterostructures.

关 键 词：properties nonlinear SYMMETRY 

分 类 号：O17[理学—数学]