Abstract
Plasmonic nanoparticles with silver cores and silica shells containing Eu fluorophores near the surface have been produced by wet chemistry method and their spontaneous emission properties characterized. Fluorescence amplification and decreased lifetime is interpreted within the Purcell framework which highlights the role of surface plasmon polariton modes of the nanoparticle. These behave as energy-storing resonators, with values of the Q factor between 50 and 170 at the fluorophore wavelength of 615 nm, and very small mode volumes, in the order of 104 nm3, producing high Purcell factors of over 4000. Comparison of experiment with theoretical calculations by using the Mie theory shows that the values of cavity Q factors are moderated by the nonradiative rate of fluorophore molecules close to metal. The criteria for laser action in such composite nanoparticles are also presented, including lasing frequencies and threshold gain.
| Original language | English |
|---|---|
| Title of host publication | Colloidal Quantum Dots/Nanocrystals for Biomedical Applications VI |
| Editors | Wolfgang J. Parak, Kenji Yamamoto, Marek Osinski |
| Place of Publication | Bellingham, Washington |
| Publisher | SPIE |
| Pages | 79090H-1-79090H-13 |
| Number of pages | 13 |
| Volume | 7909 |
| ISBN (Print) | 9780819484468 |
| DOIs | |
| Publication status | Published - 2011 |
| Event | Colloidal Quantum Dots/Nanocrystals for Biomedical Applications VI - San Francisco, CA, United States Duration: 22 Jan 2011 → 24 Jan 2011 |
Other
| Other | Colloidal Quantum Dots/Nanocrystals for Biomedical Applications VI |
|---|---|
| Country/Territory | United States |
| City | San Francisco, CA |
| Period | 22/01/11 → 24/01/11 |
Keywords
- plasmonic nanoparticles
- fluorescence enhancement
- Purcell factor
- lasing threshold
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