Sökning: "Gallium Arsenide"

Visar resultat 6 - 10 av 33 avhandlingar innehållade orden Gallium Arsenide.

  1. 6. Micro-Optical Elements in Gallium Arsenide and Diamond: Fabrication and Applications

    Författare :Mikael Karlsson; James R. Leger; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Materialvetenskap; Materials science; Teknisk materialvetenskap; Materialvetenskap; Materials Science;

    Sammanfattning : This thesis mainly treats the fabrication and applications of micro-optical elements in the semiconductor materials gallium arsenide (GaAs) and diamond.The recent trend in high-capacity data transfer using light as the information carrier creates new demands on the optoelectronic systems, such as small size, low cost and the integration of many components. LÄS MER

  3. 7. Studies on electronical properties of defects in silicon and gallium arsenide

    Författare :Mats Kleverman; Fysiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysicumarkivet A:1985:Kleverman;

    Sammanfattning : [abstract missing].... LÄS MER

  4. 8. Integrated VCOs in Gallium Arsenide HEMT technologies with a novel varactor structure

    Författare :Mattias Ferndahl; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; design; Oscillator; HEMT; pHEMT; MMIC; VCO; varactor; GaAs; mHEMT;

    Sammanfattning : This thesis presents results on metamorphic and pseudomorpic GaAs HEMT based Voltage Controlled Oscillators and a novel high-Q varactor structure, used in the VCOs, together with a straightforward extraction procedure for the varactors.Theory and fundamentals around LC-oscillators with oscillator criteria, phase noise and different topologies are given as background together with VCO phase noise measurement methods and an overview on device flicker noise; its physical origin and measurement. LÄS MER

  5. 9. Studies on deep electronic levels in silicon and aluminium gallium arsenide alloys

    Författare :Håkan Pettersson; Fasta tillståndets fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysicumarkivet A:1993:Pettersson;

    Sammanfattning : [abstract missing].... LÄS MER

  7. 10. Gallium arsenide based buried heterostructure laser diodes with aluminium-free semi-insulating materials regrowth

    Författare :Carlos Angulo Barrios; KTH; []
    Nyckelord :semiconductor lasers; in-plane lasers; VCSELs; GaAs; GaInP; semi-insulating materials; hydride vapour phase epitaxy; regrowth; buried heterostructure; leakage current; simulation;

    Sammanfattning : Semiconductor lasers based on gallium arsenide and relatedmaterials are widely used in applications such as opticalcommunication systems, sensing, compact disc players, distancemeasurement, etc. The performance of these lasers can beimproved using a buried heterostructure offering lateralcarrier and optical confinement. LÄS MER