SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Poster: Plasmonics and Nanooptics I
O 43.8: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
Exciton lifetime of decoupled phthalocyanine molecules — •Amandeep Sagwal1,2, Jiří Doležal1, Rodrigo Cezar De Campos Ferreira1, Petr Kahan1, and Martin Švec1,3 — 1Institute of Physics, Czech Academy of Sciences; Praha, Czech Republic — 2Faculty of Mathematics and Physics, Charles University; Czech Republic — 3Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences; Czech Republic
A few layers of NaCl decoupling layer on metal are sufficient to prevent the nonradiative quenching of the excited state in phthalocyanine [1] and observe fluorescence in the far field from the molecule located in the junction of a scanning tunneling microscope (STM). First attempts to measure the lifetimes of exciton in the nanocavity suggested lifetimes of hundreds of picoseconds [2,3] but later studies pointed towards a transient charge state lifetime involved in the electroluminescence excitation process [4,5] and estimated the lifetime to be several orders of magnitude lower, due to the Purcell effect of the plasmonic nanocavity. Here, we use a pulsed supercontinuum laser to reveal the radiative decay of the excited state of the molecules with and without the presence of nanocavity.
[1]*F. Aguilar-Galindo et al. ACS Photonics 8, 3495 (2021) [2]*L. Zhang et al. Nat. Commun. 8, 580 (2017). [3]*J. Doležal et al. ACS Nano 15, 7694 (2021). [4] B. Yang et al. Nat. Photonics 14, 693 (2020). [5] K. Kaiser et al. arXiv:2211.01051 (2022).