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Nanoscale Horiz. 2019 Mar 1;4(2):516-525. doi: 10.1039/C8NH00286J. Epub 2018 Nov 29.

Converting Plasmonic Light Scattering to Confined Light Absorption and Creating Plexcitons by Coupling a Gold Nano-pyramid Array onto a Silica-Gold Film.

Zheng P#1, Kasani S#2, Wu N1,3,4.

Author information

1
Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, West Virginia 26506-6106, USA.
2
Lane Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, West Virginia 26506, USA.
3
C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV 26506-6045, USA.
4
Department of Pharmaceutical Science, West Virginia University, Morgantown, WV 26506-9530, USA.
#
Contributed equally

Abstract

This report presents a facile microfabrication-compatible approach to fabricate a large area of plasmonic nano-pyramid array-based antennas and demonstrates effective light management by tailoring the architecture. First, a long-range ordered gold nano-pyramid array is fabricated, which exhibits strong light scattering. The maximum electric field enhancement (|E|/|E 0 |) of 271 is achieved at the corner but decays rapidly away from the pyramid bottom. After the gold nanopyramid array is coupled to a gold film, strong light scattering is converted into strong light absorption due to the excitation of a spectrally tunable plasmonic gap mode, where an intense electric field enhancement of 233 and a strong magnetic field enhancement (|H|/|H 0 |) of 25 are simultaneously excited for a 10 nm silica gap. The electric field decays much slower away from the pyramid bottom while the magnetic field keeps almost constant. In addition, both experiments and finite-difference time-domain (FDTD) simulation have confirmed that strong plasmon-exciton coupling between the plasmonic gap mode and the J-aggregates can take place when the quantum emitters such as J-aggregates are embedded in the gap, creating plexcitons. This can overcome the problems of high energy loss and weak nonlinearity, which are typically associated with surface plasmon polariton (SPP) supported on plasmonic metallic nanostructures. The coherent plasmon-exciton coupling (plexciton) generated by the film-coupled nano-pyramid nanostructure is expected to find promising applications in light-emitting devices, photodetectors, photovoltaics and photoelectrochemical cells.

KEYWORDS:

gold nanopyramid array; localized surface-plasmon resonance; quantum emitters; surface plasmon polariton

PMID:
31463080
PMCID:
PMC6713465
[Available on 2020-03-01]
DOI:
10.1039/C8NH00286J

Conflict of interest statement

The authors declare no competing financial interest.

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