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Insights on proximi...
Insights on proximity effect and multiphoton induced luminescence from gold nanospheres in far field optical microscopy
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- Borglin, Johan, 1986 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Institutionen för fysik (GU),Department of Chemistry and Molecular Biology,Department of Physics (GU),University of Gothenburg
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- Guldbrand, Stina, 1970 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),University of Gothenburg
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- Evenbratt, Hanne, 1980 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Kirejev, Vladimir, 1984 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,University of Gothenburg
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- Grönbeck, Henrik, 1966 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Ericson, Marica B, 1974 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,University of Gothenburg
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(creator_code:org_t)
- AIP Publishing, 2015
- 2015
- English.
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In: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 107:23
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Abstract
Subject headings
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- 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 10nm 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- Gold
- Nanoparticles
- Plasmons
- Luminescence
- Cluster analysis
- Plasmons
Publication and Content Type
- ref (subject category)
- art (subject category)
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