Search for dissertations about: "multi-photon process"

Showing result 1 - 5 of 7 swedish dissertations containing the words multi-photon process.

  2. 1. Theory of inelastic tunneling : applications to double-barrier structures and scanning tunneling microscopes

    Author : Peter Johansson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; inelastic tunneling; localized plasmon; resonant tunneling; scanning tunneling microscope; multi-photon process; enhanced spontaneous emission;

    Abstract : .... READ MORE

  4. 2. Multi-photon microscopy enhanced: Exploring annular beams and gold nano-particles for improved imaging

    Author : Johan Borglin; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Multiphoton microscopy; Beam shaping; Gold nanoparticles;

    Abstract : Laser scanning multiphoton microscopy (MPM) has emerged as a powerful tool for non-invasive three-dimensional imaging of biological tissue. The localized focal region enables confocality without the use of a physical pinhole while providing less photobleaching and photodamage compared to confocal laser scanning microscopy. READ MORE

  5. 3. Quantum chemical calculations of non-linear optical absorption

    Author : Peter Cronstrand; KTH; []
    Keywords : quantum chemical; non-linear optical; multi-photon absorption;

    Abstract : This thesis represents a quantum chemical treatise ofvarious types of interactions between radiation and molecularsystems, with special emphasis on the nonlinear opticalprocesses of Multi-Photon Absorption and Excited StateAbsorption. Excitation energies, transition dipole moments,two-photon and three-photon tensor elements have beencalculated from different approaches; density functional theoryandab-initiotheory, employing different orders ofcorrelation treatment with the purpose to provide accuratevalues as well as evaluate the quality of the lower ordermethods. READ MORE

  6. 4. Theoretical perspectives on ultrafast and non-linear spectroscopy

    Author : Emil Vinas Boström; Matematisk fysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Non-linear optics; Ultrafast dynamics; Non-equilibrium Green s functions; Density functional theory; Multi-photon absorption; Second harmonic generation; Desorption dynamics; Auger decay; Charge-separation dynamics; Quantum Zeno effect; Fysicumarkivet A:2018:Vinas Boström;

    Abstract : In this thesis we discuss a theoretical description of ultrafast and non-linear spectroscopy. Due to the high intensities and ultrashort pulse durations involved in such experiments, it is necessary to use an explicitly time-dependent formalism. READ MORE

  7. 5. Ultrafast Structural Changes in a Bacterial Photosynthetic Reaction Center probed with XFEL Radiation

    Author : Robert Dods; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Photosynthesis; Reaction Center; Time-resolved crystallography; XFEL; membrane protein;

    Abstract : Photosynthesis is the process by which plants and many species of bacteria convert energy from sunlight into chemical energy used to power their metabolism. As these plants and bacteria are eaten, the chemical energy moves up the food chain and thus photosynthesis provides fuel for almost all life on Earth. READ MORE