Wavelength-tunable dual-band edge plasmon mode based on gold edge-hole plasmonic nanostructure
Wavelength-tunable dual-band edge plasmon mode based on gold edge-hole plasmonic nanostructure
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DOI：
10.1016/j.rinp.2022.105541
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发表时间：
2022-04-27
影响因子：
5.3
通讯作者：
Endo，Tatsuro
中科院分区：
文献类型：
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作者：
Yamada，Hirotaka;Kawasaki，Daiki;Endo，Tatsuro
金属纳米结构由于其独特的光学特性而受到人们的关注。在本研究中，设计了具有边缘结构的金纳米孔，并对其具有不同波长的两个等离子体带进行了表征。这些带被分配给等离子体模式，在单个边缘结构的尖端产生集中的电场。此外，这些波段的波长以金纳米孔的形状和大小以及边缘结构为变量独立地从可见光波长调谐到近红外波长。为了证明波长可调谐，通过光学模拟成功地获得了一个具有大约785和1064 nm（分别为表面增强拉曼散射和光学镊子的典型激光波长）边缘等离子体带的金纳米结构。结果表明，本研究设计的结构为设计具有高效多光学功能的光学器件提供了指导。
Metal nanostructures have attracted attention because of their unique optical characteristics derived from localized surface plasmon resonance. In this study, gold nanoholes with edge structures were designed and characterized to possess two plasmon bands at different wavelengths. These bands were assigned to the plasmon modes that generated a concentrated electric field at the tip of the individual edge structures. Furthermore, wavelengths of these bands were independently tuned from the visible to near-infrared wavelengths with shape and size of the gold nanoholes and edge structures as variables. To demonstrate wavelength tuning, a gold nanostructure with edge plasmon bands at wavelengths of approximately 785 and 1064 nm (typical laser wavelengths for surface-enhanced Raman scattering and optical tweezers, respectively) was successfully obtained via optical simulation. The results indicate that the structure designed in this study provides a guideline for the design of optical devices with efficient multiple optical functions.