Studente TOFFOLETTI, FEDERICO
Facoltà/Dipartimento Dipartimento di Scienze Chimiche - DiSC
Corso di studio CHIMICA Laurea Magistrale (D.M. 270/2004)
Anno Accademico 2021
Titolo originale Design, preparation, and optical characterization of plexcitonic nanohybrids based on gold nanorods and J-aggregates of organic dyes
Titolo inglese Design, preparation, and optical characterization of plexcitonic nanohybrids based on gold nanorods and J-aggregates of organic dyes
Abstract in italiano The light-matter coupling has long been investigated due to its potential disruptive applications. In fact, hybrid light-matter systems promise to unlock an unprecedented capability of directing the migration of excitation energy at the nanoscale, offering exciting prospects in the field of quantum technologies, light-harvesting, and all those photonic applications that require strict control over the flow of energy in time and space. Plexcitonic nanohybrids, a class of light-matter strongly coupled systems, are nanomaterials characterized by plasmon-exciton couplings. In this Thesis, we synthesized nanohybrids systems based on gold nanorods and J-aggregates of two different cyanine molecules. These nanomaterials have been characterized by UV-Vis absorption, circular dichroism, and pump-probe spectroscopy. We found that it is possible to tune the final optical and dynamical properties by using a mixture of the two different dyes. Furthermore, we observed dynamics that are compatible with the presence of ‘one-particle’ and ‘two-particle’ states that, together with dark states, seem to be involved in a complex process of energy redistribution in the picoseconds timescale. Although further work is necessary to confirm these conclusions, the data in this Thesis provide important information for better comprehension and exploitation of plexcitonic nanohybrids.
Abstract in inglese The light-matter coupling has long been investigated due to its potential disruptive applications. In fact, hybrid light-matter systems promise to unlock an unprecedented capability of directing the migration of excitation energy at the nanoscale, offering exciting prospects in the field of quantum technologies, light-harvesting, and all those photonic applications that require strict control over the flow of energy in time and space. Plexcitonic nanohybrids, a class of light-matter strongly coupled systems, are nanomaterials characterized by plasmon-exciton couplings. In this Thesis, we synthesized nanohybrids systems based on gold nanorods and J-aggregates of two different cyanine molecules. These nanomaterials have been characterized by UV-Vis absorption, circular dichroism, and pump-probe spectroscopy. We found that it is possible to tune the final optical and dynamical properties by using a mixture of the two different dyes. Furthermore, we observed dynamics that are compatible with the presence of ‘one-particle’ and ‘two-particle’ states that, together with dark states, seem to be involved in a complex process of energy redistribution in the picoseconds timescale. Although further work is necessary to confirm these conclusions, the data in this Thesis provide important information for better comprehension and exploitation of plexcitonic nanohybrids.
Parola chiave plexcitons
gold nanorods
J-aggregates
ultrafast dynamics
strong coupling
Relatore COLLINI, ELISABETTA
Appare nelle tipologie: Lauree magistrali
File in questo prodotto:
File Dimensione Formato  
Toffoletti_Federico.pdf 7.08 MB Adobe PDF Visualizza/Apri

The text of this website © Università degli studi di Padova. Full Text are published under a non-exclusive license. Metadata are under a CC0 License

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12608/34919