Photoluminescence via gap plasmons between single silver nanowires and a thin gold film

Hailong Hu, Yuriy A. Akimov, Huigao Duan, Xianglin Li, Mingyi Liao, Rachel Lee Siew Tan, Lin Wu, Hongyu Chen, Hongjin Fan, Ping Bai, Pooi See Lee, Joel K.W. Yang*, Ze Xiang Shen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

In this work, we investigate the one-photon photoluminescence from a system consisting of an Ag nanowire on an Au film with a ∼6 nm dielectric spacer that supports a localized resonance known as the gap plasmon mode. Although the Ag nanowire and Au film exhibit weak photoluminescence on their own, the combined system produces an enhanced PL emission. Our analysis reveals that the strong PL emission in this system was due to the enhanced laser absorption in, and PL emission from Au, with the Ag nanowire acting as an efficient antenna. The PL due to the gap mode is sensitive to the polarization of the laser excitation with respect to the nanowire orientation, and shows a clear dipolar emission profile. PL emission wavelengths were found to depend only on the nanowire width, and independent of its length. These observations were supported by simulation results indicating that gap plasmons are excited by light polarized transverse to the nanowire length.

Original languageEnglish
Pages (from-to)12086-12091
Number of pages6
JournalNanoscale
Volume5
Issue number24
DOIs
Publication statusPublished - 2013
Externally publishedYes

ASJC Scopus Subject Areas

  • General Materials Science

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