Fabrication of photonic media for controlling emission and transport of light

• Autores: André Espinha
• Directores de la Tesis: Alvaro Blanco Montes (dir. tes.), Ceferino López Fernández (dir. tes.)
• Lectura: En la Universidad Autónoma de Madrid ( España ) en 2015
• Idioma: inglés
• Tribunal Calificador de la Tesis: Luisa E. Bausá (presid.), Antonio García Martín (secret.), Daniel Granados Ruiz (voc.), Antonio Agustin Mihi Cervello (voc.), Gabriel Sebastián Lozano Barbero (voc.)
• Materias:
  • Física
    • Electromagnetismo
      • Radiación infrarroja visible y ultravioleta
      • Interacción de ondas electromagnéticas con la materia
    • Óptica
      • Luz
      • Propiedades ópticas de los sólidos
• Enlaces
  • Tesis en acceso abierto en: Biblos-e Archivo
• Resumen

  • This thesis is devoted to the development of advanced photonic materials and their potential implementation in multifunctional systems. It reports the fabrication and characterization of two dimensional photonic crystals, specifically inverse monolayers of silica. A fabrication protocol introducing some novelties is presented, which allows to grow composite monolayers in a one step method and porous membranes, by sacrificing one of the components. This work is partially extended in an attempt towards the fabrication of porous membranes of silicon.

    The growth of three dimensional photonic crystals by self-assembly methods is discussed. Composite opals are grown by vertical deposition and coassembly techniques and several doping strategies with Rare Earth elements are tested. The aim of this work is to search for photonic effects, in the infrared region of trivalent erbium photoluminescence, induced by the presence of a pseudogap in silica inverse opals or by a full photonic bandgap in silicon ones.

    We further describe a replica molding procedure, adequate to imprint two dimensional gratings in the surface of shape memory polymers, by using self-assembled colloidal monolayers as templates. The obtained crystals are characterized with different techniques to assess their structural and optical properties. Their applicability in new multifunctional photonic devices with programmable and self-healing capabilities is ascertained.

    The possibility of using shape memory polymers to fabricate new nanocomposites containing titania nanoparticles that may perform as functional photonic white paints is additionally explored. Furthermore, their potential use as shape programmable active media is verified by doping them with organic dyes. Systematic photoluminescence studies are performed.