Aluminum nanoparticle films with an enhanced hot-spot intensity for high-efficiency SERS | Zendy

Zhen Li | Zendy; Chonghui Li | Zendy; Jing Yu | Zendy; Zhaoxiang Li | Zendy; Xiaofei Zhao | Zendy; Aihua Liu | Zendy; Shouzhen Jiang | Zendy; Cheng Yang | Zendy; Chao Zhang | Zendy; Baoyuan Man | Zendy

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Aluminum nanoparticle films with an enhanced hot-spot intensity for high-efficiency SERS

Author(s) -

Zhen Li,

Chonghui Li,

Jing Yu,

Zhaoxiang Li,

Xiaofei Zhao,

Aihua Liu,

Shouzhen Jiang,

Cheng Yang,

Chao Zhang,

Baoyuan Man

Publication year - 2020

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.389886

Subject(s) - plasmon , materials science , finite difference time domain method , nanostructure , surface plasmon , raman scattering , nanoparticle , optoelectronics , dielectric , nanoscopic scale , optics , coupling (piping) , raman spectroscopy , intensity (physics) , nanotechnology , composite material , physics

The weak plasmonic coupling intensity in an aluminum (Al) nanostructure has limited potential applications in excellent low-cost surface-enhanced Raman scattering (SERS) substrates and light harvesting. In this report, we aim to elevate the plasmonic coupling intensity by fabricating an Al nanoparticle (NP)-film system. In the system, the Al NP are fabricated directly on different Al film layers, and the nanoscale-thick alumina interlayer obtained between neighboring Al films acts as natural dielectric gaps. Interestingly, as the number of Al film layers increase, the plasmonic couplings generated between the Al NP and Al film increase as well. It is demonstrated that the confined gap plasmon modes stimulated in the nanoscale-thick alumina region between the adjacent Al films contribute significantly to elevating the plasmonic coupling intensity. The finite-difference time-domain (FDTD) method is used to carry out the simulations and verifies this result.

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