Modeling linear and non-linear light-matter interactionsfrom classical to atomistic nanoplasmonics

  1. VARAS BARBOZA, ALEJANDRO JAVIER
unter der Leitung von:
  1. Pablo García González Doktorvater/Doktormutter
  2. Angel Rubio Secades Doktorvater/Doktormutter

Universität der Verteidigung: Universidad del País Vasco - Euskal Herriko Unibertsitatea

Fecha de defensa: 04 von September von 2017

Gericht:
  1. Nerea Zabala Unzalu Präsident/in
  2. Francisco Javier García de Abajo Sekretär/in
  3. Francisco J. García Vidal Vocal
  4. Alejandro Manjavacas Arevalo Vocal
  5. Luis Martín Moreno Vocal
Fachbereiche:
  1. Polímeros y Materiales Avanzados: Física, Química y Teconología

Art: Dissertation

Teseo: 143860 DIALNET lock_openADDI editor

Zusammenfassung

In the last years, nanoplasmonics has become an important research field in the realm of light-matterinteractions due to the wide range of applications. Driven by the interaction of electromagnetic radiationon nanostructures, resonant excitations of the so-called surface plasmons at the frequencies of electronicexcitations in matter, leads to an enhanced of the local electric field. Motivated by this phenomenon, inthis thesis, we have modeled different linear and non-linear interaction processes betweenelectromagnetic radiation and low-dimensional nanostructures to simulate particular physicalphenomena based on nanoplasmonics. Depending on the length scale of the system to be modeled, wehave used different techniques, ranging from classical to atomistic ab-initio methods. Specifically, wehave performed: (i) DDA and finite element method calculations to analyze the plasmonic behaviour ofrecently synthesized (by a collaborative research group) non-stoichiometric heavily-dopedsemiconductor nanocrystals (Cu2-xS, and WO3-x); (ii) fully atomistic ab-initio simulations on metalcluster dimers to analyze the anisotropy effects of the plasmonic response of this nanostructures,including the electric field enhancement and the photoinduced current, as well as the influence of a oneatomjunction between the two atomic conformations; (iii) and finally, motivated by a collaboration withanother experimental research group we have modeled laser ablation processes in low-dimensionalnanostructures, driven by intense and ultrashort laser pulses (in the plasmon resonance regime). Throughthese simulations, we have analyzed if Coulomb Explosion or electrostatic ablation is the mechanism ofmaterial removal in the early stage of the gentle ablation regime.