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Enhancement of Single-Molecule Fluorescence Using a Gold Nanoparticle as an Optical Nanoantenna

✍ Scribed by Kühn, Sergei; Håkanson, Ulf; Rogobete, Lavinia; Sandoghdar, Vahid

Book ID
111671309
Publisher
The American Physical Society
Year
2006
Tongue
English
Weight
630 KB
Volume
97
Category
Article
ISSN
0031-9007

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✦ Synopsis

We investigate the coupling of a single molecule to a single spherical gold nanoparticle acting as a nanoantenna. Using scanning probe technology, we position the particle in front of the molecule with nanometer accuracy and measure a strong enhancement of more than 20 times in the fluorescence intensity simultaneous to a 20-fold shortening of the excited state lifetime. Comparisons with threedimensional calculations guide us to decipher the contributions of the excitation enhancement, spontaneous emission modification, and quenching. Furthermore, we provide direct evidence for the role of the particle plasmon resonance in the molecular excitation and emission processes.

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✍ Schumacher, Thorsten; Kratzer, Kai; Molnar, David; Hentschel, Mario; Giessen, Ha 📂 Article 📅 2011 🏛 Nature Publishing Group 🌐 English ⚖ 916 KB

Optical nanoantennas, just like their radio-frequency equivalents, enhance the light-matter interaction in their feed gap. Antenna enhancement of small signals promises to open a new regime in linear and nonlinear spectroscopy on the nanoscale. Without antennas especially the nonlinear spectroscopy