Sökning: "overgrowth"

Visar resultat 11 - 15 av 65 avhandlingar innehållade ordet overgrowth.

  1. 11. Scanning Tunneling Microscopy Induced Luminescence Studies of Semiconductor Nanostructures

    Författare :Ulf Håkanson; Fasta tillståndets fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; transmission electron microscopy TEM ; III-V semiconductors; low-dimensional structures; nanostructures; single dot spectroscopy; Stranski-Krastanow; quantum dot QD ; Semiconductory physics; polarization; ordering; InP; GaInP; photon mapping; scanning tunneling microscopy STM ; scanning tunneling luminescence STL ; Halvledarfysik; Fysicumarkivet A:2003:Håkanson;

    Sammanfattning : This thesis treats scanning tunneling luminescence (STL) investigations of semiconductor nanostructures. The STL technique combines scanning tunneling microscopy (STM) with detection of photons, induced by the tunneling electrons. The high spatial resolution in STM and the local excitation allow for optical investigations on the nanometer-scale. LÄS MER

  3. 12. New Methods in the growth of InP on Si and Regrowth of Semi-insulating InP for Photonic Devices

    Författare :Wondwosen Tilahun Metaferia; Sebastian Lourdudoss; Eric Tournié; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This thesis addresses new methods in the growth of indium phosphide on silicon for enabling silicon photonics and nano photonics as well as efficient and cost-effective solar cells. It also addresses the renewal of regrowth of semi-insulating indium phosphide for realizing buried heterostructure quantum cascade lasers with high power and wall plug efficiency for sensing applications. LÄS MER

  4. 13. Neural growth : with special emphasis on adult neurogenesis and the effect of antiepileptic drugs

    Författare :Malin Almgren; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Neurons were for a long time thought to not renew themselves. In the 1960ies the phenomenon of neurogenesis was discovered, but it was not until 1998 that neurogenesis was demonstrated in humans. LÄS MER

  5. 14. Reciprocal regulation of endocytosis and signaling in Drosophila epithelial development and aberrant growth

    Författare :Dan Liu; Christos Samakovlis; Vasilios Tsarouhas; Héctor Herranz; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; endocytosis; protein sorting; RTK signaling; airway maturation; tumor-suppressive cell competition; molekylär biovetenskap; Molecular Bioscience;

    Sammanfattning : Endocytosis and subsequent endosomal sorting of plasma membrane proteins and nutrients are essential for cellular homeostasis. Previous work has uncovered several different internalization mechanisms, endosomal sorting routes and aspects of their regulation. LÄS MER

  7. 15. Optical Studies of Single Quantum Dots

    Författare :Jonas Persson; Fasta tillståndets fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nano-optics; quantum optics; photoluminescence; micro-photoluminescence; single photon generation; Semiconductory physics; Halvledarfysik; low-dimensional structures; quantum dots; Stranski-Krastanow; Fysicumarkivet A:2004:Persson;

    Sammanfattning : This thesis presents spectroscopic studies of single self-assembled InP quantum dots (QDs). The electronic properties of these QDs have been studied by photoluminescence (PL) and scanning tunnelling luminescence (STL). The QDs were grown in the Stranski-Krastanow mode and were embedded in GaInP. LÄS MER