Au/AuPt/PtSe2 和 Au/AgPtSe2 异质体的不对称过度生长用于优化非线性增强,Advanced Optical Materials

当前位置： X-MOL 学术 › Adv. Opt. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Au/AuPt/PtSe2 和 Au/AgPtSe2 异质体的不对称过度生长用于优化非线性增强
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-11-15 , DOI: 10.1002/adom.202302140
Zhen‐Long Dou _{1,

2} , Li Cheng ₁ , Zhi‐Yong Wu ₁ , Li‐Jiong Chen _{1,

3} , Li Zhou ₁ , Qu‐Quan Wang ₂

Affiliation

由于非线性光学天线的性能与其组成和形态对称性密切相关，因此非常需要由等离子体金属和半导体或拓扑纳米材料组成的不对称异质纳米结构的良好生长。在这项工作中，提出了两种方法，通过湿化学技术在金纳米棒（AuNRs）上过度生长PtSe ₂（一种半导体或拓扑半金属材料），形成Au/AuPt/PtSe ₂和Au/AgPtSe ₂异质棒。Au/AuPt/PtSe ₂和 Au/AgPtSe ₂异质棒均表现出不对称形态：Au/AuPt/PtSe ₂异质棒表现出部分空心形态，其中蚀刻的 AuNR 包覆有 AuPt 和 PtSe ₂壳；通过Ag介导的过度生长方法制备的Au/AgPtSe ₂异质棒具有牙刷形状，AgPtSe ₂附着在AuNRs靠近一端的侧面上。当激发激光波长从1220 nm调谐到1315 nm时，两个不对称异质棒表现出显着增强的二次谐波产生的非线性辐射，并且实现了最大16的非线性增强因子，这归因于金核与硒化铂壳的相互作用以及异质结构的对称性破缺。这些发现提供了一种制备金属拓扑异质结构作为光学天线的策略，在非线性光子纳米器件的应用中具有优化的性能。

"点击查看英文标题和摘要"

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

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.

更新日期：2023-11-15

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南