Optical characterization of single molecules for quantum technologies

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dc.catalogadorgjm
dc.contributor.advisorMaze Ríos, Jerónimo
dc.contributor.authorVera Castillo, Nicolás
dc.contributor.otherPontificia Universidad Católica de Chile. Facultad de Física
dc.date.accessioned2025-03-10T12:41:24Z
dc.date.available2025-03-10T12:41:24Z
dc.date.issued2025
dc.date.updated2025-03-03T21:01:20Z
dc.descriptionTesis (Master’s degree in Physics)--Pontificia Universidad Católica de Chile, 2025.
dc.description.abstractIn this thesis, the optical properties of Vanadium Oxide Phthalocyanine (VOPc) molecules were studied using a home-built confocal microscope setup. Single VOPc molecules were successfully isolated and identified by their distinct diffraction-limited spots. Two sample preparation techniques were compared: spin coating and ion exchange. Spin coating produced less density of spots, while ion exchange resulted in more photostable spots.The emission spectra of the isolated spots were consistent with the known spectrum of VOPc, showing two peaks around 855 nm and 877 nm. The polarization response of the molecules indicated that they are randomly oriented in the sample. The lifetime of VOPc molecules was measured using time-correlated single photon counting (TCSPC), revealing an unexpected oscillatory behavior at high excitation powers, which disappeared at lower powers. This behavior suggests that the oscillation might be due to the laser's stability or noise. The lifetimes measured in an ensemble of VOPc were τ1 = 0.038 ns and τ2 = 0.221 ns for a power of 3.5 μW, and τ1 = 0.034 ns and τ2 = 0.084 ns. This power dependence on the excitation power is not the expected behavior as the lifetime should be a fixed characteristic of the molecule. Overall, the study provided valuable insights into the optical properties and isolation of VOPc molecules. Future work could focus on measuring the saturation curve of the fluorescence, confirming the presence of single molecules using second-order autocorrelation, and investigating the interaction of VOPc molecules with magnetic fields for potential applications in quantum technologies.
dc.description.funderANID-Subdirección de Capital Humano-Magíster Nacional-2023; Folio de beca: 22231517
dc.description.funderANID/Fondecyt Regular; Folio de beca: 1221512
dc.description.funderANID-ACT; Folio: 192023
dc.description.funderAir Force Office of Scientific Research (AFOSR); Folio: FA2386- 21-1-4125
dc.fechaingreso.objetodigital2025-03-10
dc.format.extentvii, 75 páginas
dc.fuente.origenAutoarchivo
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/102449
dc.information.autorucInstituto de Física; Maze Ríos, Jerónimo; 0000-0003-0751-9182; 10674
dc.information.autorucInstituto de Física; Vera Castillo, Nicolás; S/I; 1064545
dc.language.isoen
dc.nota.accesocontenido completo
dc.rightsacceso abierto
dc.rights.licenseAtribución 4.0 Internacional (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.es
dc.subject.ddc510
dc.subject.deweyMatemática física y químicaes_ES
dc.subject.ods09 Industry, innovation and infrastructure
dc.subject.odspa09 Industria, innovación e infraestructura
dc.tipo.dtdDesarrollo experimental o investigación aplicada, para la obtención de un proceso/método nuevo o mejorado
dc.tipo.dtdInvestigación bibliográfica
dc.titleOptical characterization of single molecules for quantum technologies
dc.typetesis de maestría
sipa.codpersvinculados10674
sipa.codpersvinculados1064545
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