Revealing the radiative and non-radiative relaxation rates of the fluorescent dye Atto488 in a λ/2 Fabry–Pérot-resonator by spectral and time resolved measurements

Abstract

Using a Fabry-Pérot-microresonator with controllable cavity lengths in the λ/2-regime, we show the controlled modification of the vibronic relaxation dynamics of a fluorescent dye molecule in the spectral and time domain. By altering the photonic mode density around the fluorophores we are able to shape the fluorescence spectrum and enhance specifically the probability of the radiative transitions from the electronic excited state to distinct vibronic excited states of the electronic ground state. Analysis and correlation of the spectral and time resolved measurements by a theoretical model and a global fitting procedure allows us to reveal quantitatively the spectrally distributed radiative and non-radiative relaxation dynamics of the respective dye molecule under ambient conditions at the ensemble level.

Antibiotics Coupled with Photothermal Therapy for the Enhanced Killing of Bacteria

“…Typically, after irradiation, the excited state molecules return to the ground state through the radiative pathway, as indicated by the fluorescence emission of the DMSO samples. However, in the case of the PTT mechanism, the excited state molecules ultimately follow the non-radiative relaxation pathway and thus no fluorescence emission signal can be observed ( Konrad et al ., 2016 ). For further confirmation of the presence of the PTT mechanism in an aqueous system, the relative quantum yield, and radiative and non-radiative rate constants were also calculated using Eq.s 1 , 2 , and 3 ( Table 1 ).…”

Efficient UV Luminescence from Organic-Based Tamm Plasmon Structures Emitting in the Strong-Coupling Regime

“…It can also be seen, that the PL intensity reduces dramatically with an increasing difference between the photon energies of excitation and luminescence. The decrease of the PL intensity with the increase in the offset of excitation can be explained by the existence of multiple channels of the PL quenching in organic materials, − which occurs faster than the energy relaxation.…”

Coherent Coupling of a Single Molecule to a Scanning Fabry-Perot Microcavity

“…The coupling of organic molecules to microcavities has been of interest to different communities [33][34][35][36][37][38][39][40][41][42][43][44]. Some groups have demonstrated the coupling of single-molecule fluorescence to a cavity mode [33,39] while others have investigated fluorescence lifetime changes with singlemolecule sensitivity [36,38,41,44]. However, coherent cavity effects on molecules have only been reached in ensembles [34,35,37,40,42,43] or by exploiting plasmonic nanoparticles [45].…”