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Insights on proximity effect and multiphoton induced luminescence from gold nanospheres in far field optical microscopy

Johan Borglin ; Stina Guldbrand ; Hanne Evenbratt (Institutionen för kemi och kemiteknik, Farmaceutisk teknologi) ; Vladimir Kirejev ; Henrik Grönbeck (Kompetenscentrum katalys (KCK) ; Institutionen för teknisk fysik, Kemisk fysik) ; Marica B Ericson
Applied Physics Letters (0003-6951). Vol. 107 (2015), 23, p. artikel nr 234101.
[Artikel, refereegranskad vetenskaplig]

Goldnanoparticles can be visualized in far-field multiphoton laser-scanning microscopy (MPM) based on the phenomena of multiphoton induced luminescence (MIL). This is of interest for biomedical applications, e.g., for cancer diagnostics, as MPM allows for working in the near-infrared(NIR) optical window of tissue. It is well known that the aggregation of particles causes a redshift of the plasmon resonance, but its implications for MIL applying far-field MPM should be further exploited. Here, we explore MIL from 10 nm goldnanospheres that are chemically deposited on glass substrates in controlled coverage gradients using MPM operating in NIR range. The substrates enable studies of MIL as a function of inter-particle distance and clustering. It was shown that MIL was only detected from areas on the substrates where the particle spacing was less than one particle diameter, or where the particles have aggregated. The results are interpreted in the context that the underlying physical phenomenon of MIL is a sequential two-photon absorption process, where the first event is driven by the plasmon resonance. It is evident that goldnanospheres in this size range have to be closely spaced or clustered to exhibit detectable MIL using far-field MPM operating in the NIR region.

Nyckelord: Gold, Nanoparticles, Plasmons, Luminescence, Cluster analysis



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Denna post skapades 2015-12-18. Senast ändrad 2016-03-22.
CPL Pubid: 228719

 

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Institutioner (Chalmers)

Institutionen för kemi och molekylärbiologi (GU)
Institutionen för fysik (GU) (GU)
Institutionen för kemi och kemiteknik, Farmaceutisk teknologi
Kompetenscentrum katalys (KCK)
Institutionen för teknisk fysik, Kemisk fysik (1900-2015)

Ämnesområden

Materialvetenskap
Optik

Chalmers infrastruktur