Plasmonic sphere-on-plane systems with semiconducting polymer spacer layers

Binxing Yu, Jill I. Tracey, Zhongkai Cheng, Martin Vacha, Deirdre M O'Carroll

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The optical properties of metal-film-coupled nanoparticles (NPs) are highly sensitive to physical and optical interactions between the NPs and the spacer medium in the gap between the NP and metal film. Here, we investigate the physical and optical interactions between gold NPs (AuNPs) and semiconducting conjugated polymer thin-film spacers in a "sphere-on-plane" type metal-film-coupled NP system, and their influence on the plasmonic scattering of individual AuNPs. We choose two different conjugated polymers: one with an absorption spectrum that is resonant with the plasmonic modes of the AuNPs and another that is non-resonant. By correlating dark-field back-scattering optical images with topographic atomic force microscope images, we find that partial embedding of the AuNPs occurs in both conjugated polymers to different extents. This can lead to partial quenching of certain plasmonic scattering modes, which results in a change of the back-scattering colors from the AuNPs. Pronounced, red-shifted scattering is observed due to deep embedding of the AuNPs, particularly for thicker conjugated polymer spacers that have resonant absorption with the plasmonic modes of the AuNPs. Polarization-controlled defocused dark-field imaging is employed to visualize the emergence of horizontally-polarized scattering modes upon embedding of AuNPs into the conjugated polymer spacer. These results demonstrate the importance of nanoparticle-spacer physical interactions to the control of the color and polarization of coupled plasmonic modes in nanoparticle-film systems relevant.

Original languageEnglish
Pages (from-to)11749-11757
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number17
DOIs
Publication statusPublished - Jan 1 2018

Fingerprint

Semiconducting polymers
spacers
Conjugated polymers
Nanoparticles
nanoparticles
Scattering
polymers
scattering
metal films
embedding
Metals
Polarization
Color
color
interactions
polarization
Polymer films
Gold
coupled modes
Absorption spectra

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Plasmonic sphere-on-plane systems with semiconducting polymer spacer layers. / Yu, Binxing; Tracey, Jill I.; Cheng, Zhongkai; Vacha, Martin; O'Carroll, Deirdre M.

In: Physical Chemistry Chemical Physics, Vol. 20, No. 17, 01.01.2018, p. 11749-11757.

Research output: Contribution to journalArticle

Yu, Binxing ; Tracey, Jill I. ; Cheng, Zhongkai ; Vacha, Martin ; O'Carroll, Deirdre M. / Plasmonic sphere-on-plane systems with semiconducting polymer spacer layers. In: Physical Chemistry Chemical Physics. 2018 ; Vol. 20, No. 17. pp. 11749-11757.
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