Sökning: "photonic crystals"

Visar resultat 1 - 5 av 8 uppsatser innehållade orden photonic crystals.

  1. 1. Transient Plasma Photonic Crystals - A Route Towards Slow Ultra-intense Light?

    Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

    Författare :Robin Weissenbilder; [2018]
    Nyckelord :slow; light; plasma; photonic; crystal; transient; ultra-intense; short; pulse; laser; Physics and Astronomy;

    Sammanfattning : Periodic electron and ion density modulations in near critical density plasmas induced by counterpropagating femtosecond pulses of intensities on the order of 10¹⁵ to 10¹⁶ Wcm⁻² are described in a linear and stationary regime and investigated using particle-in-cell simulations in one and two dimensions. The periodic gratings produce transient plasma photonic crystals lasting up to several picoseconds with ultra-wide angle-selective band gaps on the order of Δω/ω₀ ≈ 10-20%. LÄS MER

  3. 2. Construction and Characterization of a Confocal Setup for Functionalization of Light Emitting Diodes and Laser Diodes Using an Amorphous Nonlinear Medium

    Kandidat-uppsats, Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

    Författare :Hana Zeneli; [2018]
    Nyckelord :Characterization; Characterization Microscope; Microscope; Confocal; Amorphous Nonlinear Medium; Laser; Laser Diodes; Infrared Laser; Infrared; Optics; Nonlinear Optics; Nonlinear; White Light Emission; Infrared to White Light; Physics and Astronomy;

    Sammanfattning : A confocal microscope is built to examine molecular powders, and in particular the (PhSn)_4S_6 cluster, that emits white light when irradiated with infrared laser light. The confocal microscope operating at long working distances is assembled and characterized. LÄS MER

  4. 3. Self-Assembly and Electrical Conductivity of Colloids

    L3-uppsats, Uppsala universitet/Materialfysik

    Författare :Pier Silvio Tibaldi; [2015]
    Nyckelord :colloids; self-assembly; electrical conductivity;

    Sammanfattning : Self-assembly is an astonishing phenomenon at the base of organized structures’ formation from disordered systems. It occurs in nature from atomic and molecular lengths to galactic distances. Nowadays self-assembly of colloidal solutions can be used to fabricate photonic crystals and metamaterials. LÄS MER

  5. 4. Pseudospectra and Linearization Techniques of Rational Eigenvalue Problems

    Master-uppsats, Institutionen för matematik och matematisk statistik

    Författare :Axel Torshage; [2013]
    Nyckelord :Pseudospectra; Linearization; Rational Eigenvalue Problems;

    Sammanfattning : This thesis concerns the analysis and sensitivity of nonlinear eigenvalue problems for matrices and linear operators. The first part illustrates that lack of normality may result in catastrophic ill-conditioned eigenvalue problem. LÄS MER

  7. 5. Simulation of Phased Arrays with Rectangular Microstrip Patches on Photonic Crystal Substrates

    Master-uppsats, Institutionen för datavetenskap, fysik och matematik, DFM

    Författare :Asim Akhtar; Hassan Mateen Alahi; Moeed Sehnan; [2012]
    Nyckelord :Phased arrays antenna on photonic crystal;

    Sammanfattning : This thesis describes the investigation of photonic crystals as a substrate in microstrip phased array antennas. Alumina with a relative dielectric constant of 9.6 is used as substrate to obtain miniaturization of the components in the high-frequency range. LÄS MER