Strong nonlinear optical processes with extraordinary polarization anisotropy in inversion-symmetry broken two-dimensional PdPSeOACSTPCD
Strong nonlinear optical processes with extraordinary polarization anisotropy in inversion-symmetry broken two-dimensional PdPSe
Nonlinear optical activities,especially second harmonic generation(SHG),are key phenomena in inversion-symmetry-broken two-dimensional(2D)transition metal dichalcogenides(TMDCs).On the other hand,anisotropic nonlinear optical processes are important for unique applications in nano-nonlinear photonic devices with polarization functions,having become one of focused research topics in the field of nonlinear photonics.However,the strong nonlinearity and strong optical anisotropy do not exist simultaneously in common 2D materials.Here,we demonstrate strong second-order and third-order susceptibilities of 64pmN and 6.2×10-19 m2/V2,respectively,in the even-layer PdPSe,which has not been discovered in other common TMDCs(e.g.,MoS2).Strikingly,it also simultaneously exhibited strong SHG anisotropy with an anisotropic ratio of～45,which is the largest reported among all 2D materials to date,to the best of our knowledge.In addition,the SHG anisotropy ratio can be harnessed from 0.12 to 45(375 times)by varying the excitation wavelength due to the dispersion of x(2)values.As an illustrative example,we further demonstrate polarized SHG imaging for potential applications in crystal orientation identification and polarization-dependent spatial encoding.These findings in 2D PdPSe are promising for nonlinear nanophotonic and optoelectronic applications.
Song Zhu;Jinluo Cheng;Yao Wu;Houkun Liang;Junichiro Kono;Xingji Li;Zheng Liu;Qi Jie Wang;Ruihuan Duan;Xiaodong Xu;Fangyuan Sun;Wenduo Chen;Fakun Wang;Siyuan Li;Ming Ye;Xin Zhou
School of Electrical and Electronic Engineering,Nanyang Technological University,639798 Singapore,SingaporeGPL Photonics Lab,State Key Laboratory of Applied Optics,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,130033 Changchun,ChinaSchool of Material Science and Engineering,Nanyang Technological University,639798 Singapore,SingaporeSchool of Electronics and Information Engineering,Sichuan University,610064 Chengdu,Sichuan,ChinaSchool of Physical and Mathematical Sciences,Nanyang Technological University,637371 Singapore,Singapore||Departments of Electrical and Computer Engineering,Physics and Astronomy,and Materials Science and NanoEngineering,Rice University,Houston,TX,USASchool of Materials Science and Engineering,Harbin Institute of Technology,150001 Harbin,ChinaSchool of Material Science and Engineering,Nanyang Technological University,639798 Singapore,Singapore||CINTRA CNRS/NTU/THALES,UMI 3288,Research Techno Plaza,Nanyang Technological University,637371 Singapore,SingaporeSchool of Electrical and Electronic Engineering,Nanyang Technological University,639798 Singapore,Singapore||CINTRA CNRS/NTU/THALES,UMI 3288,Research Techno Plaza,Nanyang Technological University,637371 Singapore,Singapore||School of Physical and Mathematical Sciences,Nanyang Technological University,637371 Singapore,SingaporeDepartment of Chemistry,National University of Singapore,117543 Singapore,Singapore
《光：科学与应用（英文版）》 2024 (008)
1524-1533 / 10
This work was supported by the Singapore Ministry of Education(MOE-T2EP50120-0009),Agency for Science,Technology and Research(A*STAR)(M22K2c0080,R23IOIR041,and A2090b0144),National Medical Research Council(NMRC)(Award number MOH-000927),National Research Foundation Singapore(Award No.NRF-CRP22-2019-0007 and NRF-CRP23-2019-0007),National Research Foundation,Singapore under its Al Singapore Programme(AISG Award No:AISG2-GC-2023-009),and National Research Foundation(Award No.NRF2020-NRF-ISF004-3520).
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