Broadband light generation from Au–Al 2 O 3 –Al sub-10 nm plasmonic gap structures

We demonstrate broadband photoluminescence (PL) from a Au nanorod–alumina–Al substrate (Au–Al 2 O 3 –Al) sandwich structure under a peak excitation power intensity of 1.45–2.61 GW cm −2 . The emission wavelength is in the range of 450–1050 nm and the lifetime is on the sub-nanosecond timescale. Comp...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2017, Vol.5 (27), p.6771-6776
Main Authors: Yao, Lin-Hua, Ma, Zong-Wei, Song, Xian-Yin, Xiao, Xiang-Heng, Wang, Xia, Zhou, Nan, Zhai, Tian-You, Zhang, Jun-Pei, Han, Jun-Bo
Format: Article
Language:English
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Summary:We demonstrate broadband photoluminescence (PL) from a Au nanorod–alumina–Al substrate (Au–Al 2 O 3 –Al) sandwich structure under a peak excitation power intensity of 1.45–2.61 GW cm −2 . The emission wavelength is in the range of 450–1050 nm and the lifetime is on the sub-nanosecond timescale. Comparative studies of the PL from Au–Al 2 O 3 –Al with different Au rod lengths and Au–Al 2 O 3 without an Al coupling layer, together with finite difference time domain (FDTD) calculations, show that the PL from Au–Al 2 O 3 –Al originates from the surface plasmon enhanced supercontinuum (SC) generation in the Al 2 O 3 membrane. This observation indicates that a SC could be realized in nanoscale plasmonic structures, which has promising applications in the minimization and integration of light sources in photonic devices.
ISSN:2050-7526
2050-7534
DOI:10.1039/C7TC01683B