TY - JOUR
T1 - Dye fluorescence enhancement and quenching by gold nanoparticles
T2 - Direct near-field microscopic observation of shape dependence
AU - Horimoto, Noriko Nishizawa
AU - Imura, Kohei
AU - Okamoto, Hiromi
N1 - Funding Information:
The work was supported in part by Grants-in-Aid for Scientific Research Nos. 17655011 and 18205004 from the Japan Society for the Promotion of Science and No. 17034062 from the Ministry of Education, Culture, Sports, Science and Technology, and a grant from the Kurata Science Foundation.
PY - 2008/12/15
Y1 - 2008/12/15
N2 - We investigated the enhancement and quenching of dye fluorescence by single gold nanoparticles using an aperture-type scanning near-field optical microscope to evaluate the shape dependence. Enhancement or reduction of fluorescence was found to be strongly dependent on the shape of the particle. Gold nanoplates showed significant fluorescence enhancement, as did aggregated nanoparticles for the most part. On the other hand, gold nanorods with high aspect ratios showed quenching effects. The results suggest that the electromagnetic near-field in the vicinity of the surface of nanoparticles, not just near the apex or the tip but the whole surface, is important for understanding fluorescence enhancement and quenching.
AB - We investigated the enhancement and quenching of dye fluorescence by single gold nanoparticles using an aperture-type scanning near-field optical microscope to evaluate the shape dependence. Enhancement or reduction of fluorescence was found to be strongly dependent on the shape of the particle. Gold nanoplates showed significant fluorescence enhancement, as did aggregated nanoparticles for the most part. On the other hand, gold nanorods with high aspect ratios showed quenching effects. The results suggest that the electromagnetic near-field in the vicinity of the surface of nanoparticles, not just near the apex or the tip but the whole surface, is important for understanding fluorescence enhancement and quenching.
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U2 - 10.1016/j.cplett.2008.10.067
DO - 10.1016/j.cplett.2008.10.067
M3 - Article
AN - SCOPUS:57049094355
VL - 467
SP - 105
EP - 109
JO - Chemical Physics Letters
JF - Chemical Physics Letters
SN - 0009-2614
IS - 1-3
ER -