Asymmetric Overgrowth of Au/AuPt/PtSe2 and Au/AgPtSe2 Heterorods for Optimizing Nonlinear Enhancements

被引:18
作者
Dou, Zhen-Long [1 ,2 ]
Cheng, Li [1 ]
Wu, Zhi-Yong [1 ]
Chen, Li-Jiong [1 ,3 ,4 ]
Zhou, Li [1 ]
Wang, Qu-Quan [2 ]
机构
[1] Wuhan Univ, Sch Phys & Technol, Key Lab Artificial Micro & Nanostruct, Hubei Nucl Solid Phys Key Lab,Minist Educ, Wuhan 430072, Peoples R China
[2] Southern Univ Sci & Technol, Dept Phys, Coll Sci, Shenzhen 518055, Peoples R China
[3] Nanjing Univ, Sch Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
[4] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China
基金
中国国家自然科学基金;
关键词
nonlinear nanoantennas; PtSe2; second harmonic generation; surface plasmon resonance; topological materials; CORE-SHELL NANOSTRUCTURES; PTSE2; FILMS; 2ND-HARMONIC GENERATION; METAL-DICHALCOGENIDE; GOLD NANORODS; EVOLUTION; GROWTH; SITES;
D O I
10.1002/adom.202302140
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Favorable growth of asymmetric hetero-nanostructures consisting of plasmonic metals and semiconductors or topological nanomaterials is highly desired because the performance of nonlinear optical antennas is closely related to their composition and morphology symmetry. In this work, two methods are proposed to overgrow PtSe2, a semiconductor or topological semimetal material, onto Au nanorods (AuNRs) to form Au/AuPt/PtSe2 and Au/AgPtSe2 heterorods via wet chemical technique. Both Au/AuPt/PtSe2 and Au/AgPtSe2 heterorods show asymmetric morphologies: the Au/AuPt/PtSe2 heterorods show a partially hollow morphology with an etched AuNR coated by AuPt and PtSe2 shells; the Au/AgPtSe2 heterorods prepared by Ag-mediated overgrowth method have a toothbrush shape with AgPtSe2 attached on the side surface near one end of AuNRs. The two asymmetric heterorods show significantly enhanced nonlinear radiations of second harmonic generation with the excitation laser wavelength tuning from 1220 to 1315 nm, and a maximal nonlinear enhancement factor of 16 is achieved, which is attributed to the interaction of gold core with platinum selenide shell and the broken symmetry of heterostructures. The findings provide a strategy to prepare metal-topological heterostructures as optical antennas with optimized performance in the application of nonlinear photonic nanodevices.
引用
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页数:8
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