|
| 石墨烯对纳米多孔金局域表面等离激元共振的调控 |
| Graphene modulation of localized surface plasmon resonance in nanoporous gold |
| 投稿时间:2024-03-18 |
| DOI:10.3969/j.issn.1005-5630.202403180055 |
| 中文关键词: 局域表面等离激元共振 石墨烯 纳米多孔金 散射式近场扫描光学显微技术 时域有限差分法 |
| 英文关键词:localized surface plasmon resonance graphene nanoporous gold scattering near-field scanning optical microscopy finite difference time domain method |
| 基金项目:国家自然科学基金(61875126) |
|
| 摘要点击次数: 982 |
| 全文下载次数: 316 |
| 中文摘要: |
| 利用散射式近场扫描光学显微技术(scattering near-field scanning optical microscopy,s-SNOM)对纳米多孔金(nanoporous gold,NPG)和石墨烯包覆的纳米多孔金(G@NPG)两种样品进行表征,发现石墨烯可以削弱NPG的局域表面等离激元共振(localized surface plasmon resonance,LSPR)强度。为了研究石墨烯使NPG热点减弱的原因,利用时域有限差分仿真的方法对该现象进行分析,仿真结果与s-SNOM的表征结果一致,并且从两种样品的吸收光谱中发现石墨烯可以消除由NPG的不规则结构造成的多LSPR模式。从石墨烯包覆的金纳米颗粒(graphene@nanoparticle,G@NP)的仿真结果中可以看出被石墨烯包覆的NP的LSPR峰的峰位出现了明显的红移,并且峰宽会增大,说明等离激元的寿命发生衰减。这解释了G@NPG的近场信号强度弱于NPG的原因,以及石墨烯可以消除NPG的多LSPR模式的原因。在设计具有波长选择性的NPG器件时,石墨烯可以作为一种调控纳米多孔金LSPR的备选材料。 |
| 英文摘要: |
| In this paper, by characterizing two samples, nanoporous gold (NPG) and graphene-coated nanoporous gold (G@NPG), using scattering near-field scanning optical microscopy (s-SNOM), it is found that graphene can weaken the localized surface plasmon resonance (LSPR) intensity of NPG. In order to investigate the reason why graphene weakens the hotspot of NPG, this paper analyzes the phenomenon by using finite-difference time-domain simulation, and the simulation results are consistent with the characterization results of s-SNOM. From the absorption spectra of the two samples, we find that graphene can eliminate the phenomenon of multiple LSPR modes caused by the irregular structure of NPG. The simulation results of graphene-coated gold nanoparticles (G@NP) show that the peak position of the LSPR peak of graphene-coated NPs shows an obvious red shift and the peak width increases, indicating that the lifetime of the plasmon is attenuated. This explains why the near-field signal intensity of G@NPG is weaker than that of NPG, and why graphene can eliminate the multiple LSPR modes of NPG. In the design of wavelength-selective NPG devices, graphene can be used as an alternative material to modulate the LSPR of nanoporous gold. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |