Sökning: "Thermal Diode"

Visar resultat 21 - 25 av 44 avhandlingar innehållade orden Thermal Diode.

  1. 21. Modelling and Characterisation of Terahertz Planar Schottky Diodes

    Författare :Aik-Yean Tang; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This thesis deals with the modelling and characterisation of THz planar Schottky diodes, focusing on analyses of geometry-dependent electrical parasitics and the thermal management of the diode chip. Moving towards higher operating frequencies, the diode performance degrades due to high frequency losses, parasitic couplings and self-heating effects. LÄS MER

  3. 22. Novel materials for Yb and Er-Yb doped microchip lasers

    Författare :Jonas Hellström; Fredrik Laurell; Lars Sjöqvist; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mid-IR lasers; laser materials; Optical physics; Optisk fysik;

    Sammanfattning : The objective of this thesis has been to investigate novel host material configurations for high-power end-pumped Er-Yb co-doped, or Yb doped microchip lasers and try to increase their performance. In Er-Yb co-doped systems, the main limitation is the thermal shortcomings of the phosphate glass host material. LÄS MER

  4. 23. Silicon Integrated HBV Frequency Multipliers for THz Applications

    Författare :Aleksandra Malko; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; frequency multipliers; Heterostrucutre Barrier Varactors HBVs ; THz sources; wafer bonding.; integrated circuits; heterogeneous integration; Compund semiconductors; epitaxial transfer; MICs;

    Sammanfattning : This thesis deals with integrated varactor diode circuits for terahertz (THz) applications. In particular hybrid, monolithic microwave integrated circuits (MMICs), and heterogeneous integration are explored for frequency multiplier applications. LÄS MER

  5. 24. Development of infrared spectroscopy techniques for environmental monitoring

    Författare :Jonas Sandsten; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; environmental pollution measurements; infrared spectrometers; diffraction and scattering; absorption spectroscopy; remote sensing; ray tracing; image processing; Atomic and molecular physics; Atom- och molekylärfysik; Fysicumarkivet A:2000:Sandsten;

    Sammanfattning : Infrared spectroscopy techniques have long been utilized in identifying and quantifying species of interest to us. Many of the elementary molecules in the atmosphere interact with infrared radiation through their ability to absorb and emit energy in vibrational and rotational transitions. LÄS MER

  7. 25. Fabrication of Integrated HBV Multipliers for THz Generation

    Författare :Aleksandra Malko; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; silicon.; indium phosphide; frequency multipliers; power sensors; Epitaxial transfer; heterostructure barrier varactors;

    Sammanfattning : The main objective of this licentiate thesis is to demonstrate silicon integrated HBV frequency multipliers for THz generation with RF performance comparable with InP technology. The choice of silicon is motivatedby better thermal and mechanical properties, cost and ease of integration compared to III-V semiconductor substrates. LÄS MER