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Optical tuning of plasmon-enhanced photoluminescence

Abstract

Photoluminescence (PL) can be enhanced and tuned with the assistance of surface plasmons. Traditional methods of generating tunable fluorophores are either of low efficiency or complicated with poor controllability. Here, we propose the optical tuning and enhancement of PL by modifying the plasmon modes, which shows unique advantages of generality, simplicity, and on-demand controllability. We adopt gold nanoparticle on a mirror as the plasmonic resonator, and responsive polymers as the spacers as well as the emitters in the nanogaps. By controlling the coating thickness of polymers, we can achieve tunable plasmon resonances as well as PL peaks with enhancement factor up to ~7000. Further, we show optical tuning of the plasmon resonances via laser irradiation which modifies the nanogaps. Thus, the PL peaks of the polymers shift accordingly with plasmon resonances. This tuning mechanism is based on plasmon-enhanced PL, which selectively enhances PL signals at different wavelengths. Such a plasmon-assisted PL selection with optical tuning method provides new opportunities for photonic devices with applications of multiplex sensing and full colour displays.

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Supplementary files

Publication details

The article was accepted on 04 May 2019 and first published on 06 May 2019


Article type: Communication
DOI: 10.1039/C9NR03725J
Nanoscale, 2019, Accepted Manuscript

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    Optical tuning of plasmon-enhanced photoluminescence

    Y. Wang and T. Ding, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR03725J

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