Sökning: "Photonic crystal"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden Photonic crystal.

  1. 1. Towards a tunable, wide-band acoustic transducer operating in the quantum regime.

    Master-uppsats, KTH/Tillämpad fysik

    Författare :Abel Hugot; [2022]
    Nyckelord :Hybrid quantum systems; Acoustics; Impedance matching; SQUIDs; Hybrida kvantsystem; Akustik; Impedansanpassning; SQUIDs.;

    Sammanfattning : In the past decade we have seen fast development of new quantum technologies that promise to revolutionise communications and computing. Many different routes are explored to physically implement such quantum technologies. Among others, we can mention superconducting circuits, spin-based devices and photonic devices. LÄS MER

  3. 2. 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

  4. 3. Design and Fabrication of 1550 nm Photonic Crystal Surface Emitting Lasers

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :João Martins de Pina; [2018]
    Nyckelord :Photonic crystal; surface-emitting laser; metal organic chemical vapour deposition; III-V semi- conductors; light emitting diode.;

    Sammanfattning : In this study, the design and fabrication of a monolithic InP-based 1550-nm photonic-crystal surfaceemitting laser (PCSEL) is reported. The device is composed by an InGaAsP multi-quantum well (MQW) active layer and InP photonic crystal (PhC) formed by metal organic chemical vapour deposition (MOCVD). LÄS MER

  5. 4. Model of a Wave Diode in a Nonlinear System

    Kandidat-uppsats, Linköpings universitet/Teoretisk Fysik; Linköpings universitet/Tekniska högskolan

    Författare :Erik Johansson; [2014]
    Nyckelord :Discrete Nonlinear Schrödinger Wave Diode Cubic Saturable Asymmetric Propagation;

    Sammanfattning : In this diploma work, two versions of the discrete nonlinear Schrödinger (DNLS) equation are used to model a nonlinear layered photonic crystal system; the cubic DNLS (cDNLS) equation and the saturable DNLS (sDNLS) equation. They both have site-dependent coefficients to break mirror symmetry with respect to propagation direction, as well as to describe the linear and nonlinear properties of the system. 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