• Anomalous diffusion in axismmetric photonic crystals 

      Sardà Ventosa, Meritxell (Universitat Politècnica de Catalunya, 2014-12-09)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      In the proposed work such structures are to be numerically simulated in order to justify the expected behaviour, as well as measured experimentally. The samples for the experimental part of the study are being fabricated ...
    • Broad area lasers beam quality improvement using photonic crystals 

      Garre Werner, Guillermo (Universitat Politècnica de Catalunya, 2017-10-27)
      Projecte Final de Màster Oficial
      Accés restringit per acord de confidencialitat
      Edge-emitting broad area semiconductor lasers (BAL) have a wide range of applications due to their high power, however, are strongly limited by their beam quality. Here, we consider a BAL with an external cavity configuration ...
    • Intracavity spatial filtering in broad area semiconductor laser 

      Gawali, Sandeep Babu (Universitat Politècnica de Catalunya, 2020-12-17)
      Tesi
      Accés obert
      Semiconductor lasers in high-power regime typically manifest a poor beam quality due to its asymmetric beam divergence and its large beam quality factor (M2). The emission along one of the transverse directions (slow axis) ...
    • Light beam propagation in complex crystals 

      Kumar, Nikhil P. (Universitat Politècnica de Catalunya, 2017-07-13)
      Tesi
      Accés obert
      Recent advancement in Photonics have brought about a new era of miniaturisation. Along came a need for technology to allow the manipulation of light at the micrometer scale, with precise control over beam propagation. The ...
    • Liquid crystals in woodpile photonic crystals : fabrication, numerical calculation and measurement 

      Ho, Chih-Hua (Universitat Politècnica de Catalunya, 2016-03-14)
      Tesi
      Accés obert
      Both experimental and numerical studies on Liquid Crystal (LC) infiltrated woodpile Photonic Crystal (PhC) are implemented in this thesis. The most well-known optical phenomenon of PhC is photonic bandgap (PBG). It is ...
    • Shaping of light beams with photonic crystals : spatial filtering, beam collimation and focusing 

      Maigyte, Lina (Universitat Politècnica de Catalunya, 2014-07-01)
      Tesi
      Accés obert
      The research developed in the framework of this PhD thesis is a theoretical, numerical and experimental study of light beam shaping (spatial filtering, beam collimation and focusing) in the visible frequency range using ...
    • Spatial beam manipulation by Photonic Crystal 

      Basurto Zapana, Jorge Luis (Universitat Politècnica de Catalunya, 2014-09-08)
      Projecte Final de Màster Oficial
      Accés obert
      [ANGLÈS] We present such aspects of beam propagation as the double focalization, the dependence of focusing on frequency, and the effects of a limited numerical aperture of this lens.
    • Spatial Filter based on Photonic Crystals 

      Maigyte, Lina (Universitat Politècnica de Catalunya, 2011-07-19)
      Projecte Final de Màster Oficial
      Accés obert
      Engish: Photonic crystals are considered as promising materials for controlling and manipulating the flow of light. In this work we give first experimental evidences of spatial filtering of light beams by three-dimensional ...
    • Suppression and control of modulation instability 

      Kumar, Shubham (Universitat Politècnica de Catalunya, 2017-06-21)
      Tesi
      Accés obert
      Dynamical instabilities which lead to spontaneous pattern formation are present in a wide variety of nonlinear dynamical systems, both in nature as well as in technological areas. The instabilities may be saturating, leading ...