Now showing items 1-7 of 7

  • Broad area lasers beam quality improvement using photonic crystals 

    Garre Werner, Guillermo (Universitat Politècnica de Catalunya, 2017-10-27)
    Master thesis
    120 months embargo
    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 ...
  • Light beam propagation in complex crystals 

    Kumar, Nikhil P. (Universitat Politècnica de Catalunya, 2017-07-13)
    Doctoral thesis
    Open Access
    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)
    Doctoral thesis
    Open Access
    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)
    Doctoral thesis
    Open Access
    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)
    Master thesis
    Open Access
    [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)
    Master thesis
    Open Access
    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)
    Doctoral thesis
    Open Access
    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 ...