Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 7, Issue 9, Pages 1604-1609Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b00491
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Funding
- European Commission (ERC) [247330, 670949]
- Spanish MINECO - FEDER [FIS2012-35527, FIS2014-55563-REDC, SEV-2015-0522]
- Catalan AGAUR [2014 SGR01540]
- Fundacio CELLEX (Barcelona)
- Biotechnology and Biological Sciences Research Council (BBSRC)
- Marie-Curie International Fellowship COFUND
- ICFOnest program
- Marie Sklodowska-Curie fellowship [655542]
- ICREA Funding Source: Custom
- BBSRC [BB/K000179/1] Funding Source: UKRI
- European Research Council (ERC) [670949] Funding Source: European Research Council (ERC)
- Marie Curie Actions (MSCA) [655542] Funding Source: Marie Curie Actions (MSCA)
- Biotechnology and Biological Sciences Research Council [BB/K000179/1] Funding Source: researchfish
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Nanoantennas are well-known for their effective role in fluorescence enhancement, both in excitation and emission. Enhancements of 3-4 orders of magnitude have been reported. Yet in practice, the photon emission is limited by saturation due to the time that a molecule spends in singlet and especially triplet excited states. The maximal photon stream restricts the attainable enhancement. Furthermore, the total number of photons emitted is limited by photobleaching. The limited brightness and observation time are a drawback for applications, especially in biology. Here we challenge this photon limit, showing that nanoantennas can actually increase both saturation intensity and photostability. So far, this limit-shifting role of nanoantennas has hardly been explored. Specifically, we demonstrate that single light-harvesting complexes, under saturating excitation conditions, show over a 50-fold antenna-enhanced photon emission stream, with 10-fold more total photons, up to 108 detected photons, before photobleaching. This work shows yet another facet of the great potential of nanoantennas in the world of single-molecule biology.
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