| Publication Type |
Journal Article |
| Title |
Extreme Enhancement of Single-Molecule Fluorescence from Porphyrins Induced by Gold Nanodimer Antennas |
| Authors |
Alexandra P. Francisco David Botequim Duarte M. F. Prazeres Vanda Vaz Serra Sílvia M. B. Costa Cesar A. T. Laia Pedro M. R. Paulo |
| Groups |
MPPM |
| Journal |
JOURNAL OF PHYSICAL CHEMISTRY LETTERS |
| Year |
2019 |
| Month |
April |
| Volume |
10 |
| Number |
7 |
| Pages |
1542-1549 |
| Abstract |
Porphyrins are typically weak emitters, which presents challenges to their optical detection by single-molecule fluorescence microscopy. In this contribution, we explore the enhancement effect of gold nanodimer antennas on the fluorescence of porphyrins in order to enable their single-molecule optical detection. Four meso-substituted free-base porphyrins were evaluated: two cationic, one neutral, and one anionic porphyrin. The gold nanodimer antennas are able to enhance the emission from these porphyrins by a factor of 10(5) -10(6) increase in the maximum detected photon rates. This extreme enhancement is due to the combination of an antenna effect on the excitation rate that is estimated to be above 10(4) -fold and an emission efficiency that corresponds to an increase of 2-10 times in the porphyrin s fluorescence quantum yield. |
| DOI |
http://dx.doi.org/10.1021/acs.jpclett.9b00373 |
| ISBN |
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| Publisher |
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| Book Title |
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| ISSN |
1948-7185 |
| EISSN |
|
| Conference Name |
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| Bibtex ID |
ISI:000463960700018 |
| Observations |
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