Browsing Physics (Theses and Dissertations) by Date of Publication

Now showing items 21-40 of 442

    • Curing of complex monomer systems: a spectroscopic and thermal analysis 

      Martin, Seán J. (Trinity College (Dublin, Ireland). School of Physics, 2001)
      This thesis describcs the development of a novel methodology, which uses the high resolution liquid nuclear magnetic resonance (NMR) spectroscopic technique to continuously monitor in real time the thermal and UV-photoinitiated ...

    • Thermo and electro-optical analysis of polymer dispersed liquid crystal systems 

      Petti, Lucia (Trinity College (Dublin, Ireland). School of Physics, 2002)
      The objective of the work performed in this thesis is to prepare Polymer Dispersed Liquid Crystal (PDLC) systems under optimised preparation conditions and with improved liquid crystal/polymer composition for thermo-and ...

    • Numerical investigations of magnetic field effects on electrodeposition 

      Ní Mhíocháin, Teresa (Trinity College (Dublin, Ireland). School of Physics, 2002)
      Electrodeposits are fractal in nature when grown in a flat electrochemical cell, in which an aqueous solution of salt of a metal such as Cu, Zn or Ag is held between an anode and cathode by two flat sheets of perspex. These ...

    • Dispersion of the third order optical nonlinearity & all-optical switching figures of merit in molecularly engineered polymers 

      Ryder, Kieran (Trinity College (Dublin, Ireland). School of Physics, 2002)
      Solid state and solution measurements of the effective third order nonlinear absorption and refraction, have been earned out on poly (2,5-dioctyloxy-paraphenylene-vinylene-co-2,5- pyridinyl) (Pyridinyl PAV), poly ...

    • Scanning near-field microscopy of microwave circuits 

      Kantor, Roman (Trinity College (Dublin, Ireland). School of Physics, 2002)
      The topic of this thesis is the development and testing of measurement techniques for high resolution imaging of the field induced by microwave circuits in the near-field region. The theoretical aspects of the near-field ...

    • Multiphoton processes in a series of designer organic materials 

      Brennan, Margaret Elizabeth (Trinity College (Dublin, Ireland). School of Physics, 2002)
      Multiphoton processes in a series of promising organic materials; an endohedral metallofullerene, La@C82, carbon nanotubes and a set of axially substituted phthalocyanines have been studied.

    • Mesoscopic transport in ferromagnetic oxides 

      Versluijs, Jan Johannes (Trinity College (Dublin, Ireland). School of Physics, 2002)
      The study presented in this thesis is concerned with mesoscopic transport in half metallic ferromagnetic oxides. Two techniques have been developed to gain insight into the extrinsic transport properties of these oxides. ...

    • Investigations in real-time confocal microscopy 

      Taylor, Cian M. (Trinity College (Dublin, Ireland). School of Physics, 2002)
      This thesis is a study of imaging in real-time confocal imaging systems. The particular instrument examined is the direct-view microscope (DVM), an instrument which allows real-time confocal imaging through the use of an ...

    • Ion outflow and soft X-ray radiation from a micro capillary discharge source and laser produced plasma 

      Hansen, Tue N. (Trinity College (Dublin, Ireland). School of Physics, 2002)
      This thesis concerns itself with the study of pulsed plasma sources. The plasma is produced either in an electrical discharge or by a laser pulse. The plasma is generated on a nanosecond time scale, after which it evolves ...

    • Mechanically alloyed Sm-Co hard magnetic materials 

      Gallagher, Kathleen (Trinity College (Dublin, Ireland). School of Physics, 2002)
      In the recent search for new high-temperature permanent magnet materials, research has concentrated on bulk Sm2Co17-type magnets. The usual approach to development of coercivity in bulk Sm-Co based materials is to prepare ...

    • Numerical and experimental investigation of a novel waveguide design for use in high power laser diode devices 

      Patchell, John A. (Trinity College (Dublin, Ireland). School of Physics, 2002)
      Because of their efficiency, small size and reliability high power laser diodes are used for numerous tasks, such as the pumping of solid state lasers, second harmonic generation and the pumping of rare earth fibre ...

    • Surface reconstructions of Fe3 O4 (001) 

      Mariotto, Guido (Trinity College (Dublin, Ireland). School of Physics, 2002)
      In this thesis, the (001) surface of magnetite artificial single crystals has been studied using low-energy electron diffraction (LEED), Auger electron spectroscopy (AES) and Scanning Tunneling Microscopy (STM). STM ...

    • Investigation into semiconductor microcavity light emitting strucutres, and the assessment of InAs/GaAs quantum dots as sources for etched microstructures 

      Shaw, Alan J. (Trinity College (Dublin, Ireland). School of Physics, 2002)
      The spectral, spatial, and temporal characteristics of the spontaneous light emission process are dependent on the optical environment with which the emitter interacts. Cavity structures with dimensions of the order of the ...

    • A dynamic study of cavity polaritons 

      Dunbar, L. A. (Trinity College (Dublin, Ireland). School of Physics, 2002)
      Strong coupling between an atom and a cavity field is a well established phenomenon in the field of cavity quantum electrodynamics. However it was not until 1992 that improvements in growth technology resulted in the advent ...

    • Mechanical properties of carbon nanotube polymer composites 

      Lahr, Bernd (Trinity College (Dublin, Ireland). School of Physics, 2002)
      In this study the production and optimisation of carbon nanotubes using the arc discharge method was investigated. The soot produced was analysed for the nanotube content. To remove the nanotubes from the soot a novel ...

    • Ultrafast non-linear optics for telecommunication applications 

      Communal, Jean-Edouard Paul Camille (Trinity College (Dublin, Ireland). School of Physics, 2003)
      The aim of the research done for this thesis was to characterise the properties of a fibre laser producing ultrashort pulses at the telecommunication wavelength of 1550nm. We also measured the nonlinear optical properties ...

    • Design and fabrication of a waveguiding organic double heterostructure light-emitting device : a milestone in the development of an electrically pumped polymer laser 

      Belton, Colin (Trinity College (Dublin, Ireland). School of Physics, 2003)
      The development of an electrically pumped polymer laser fabricated using simple solution processing would revolutionise the optial data storage and communications industry. In order to achieve this, a research strategy, ...

    • Galaxy clusters, voids and elliptical galaxies using the ROSAT PSPC 

      Carr, Michael (Trinity College (Dublin, Ireland). School of Physics, 2003)
      The ROSAT data archive contains of the order of 100,000 sources observed by the ROSAT PSPC (Position Sensitive Proportional Counter). For many sources detected with the ROSAT PSPC there is not a sufficient number of photons ...

    • Paramagnetic defects in thin carbon films 

      Jones, Benjamin James (Trinity College (Dublin, Ireland). School of Physics, 2003)
      This thesis is an investigation into paramagnetic defects in thin carbon films, their nature and the effects of deposition parameters and post deposition treatments. Electron paramagnetic resonance (EPR) is used to examine ...

    • Nonlinear optical extinction in polymer-carbon nanotube and phthalocyanine systems 

      O'Flaherty, Seán Martin (Trinity College (Dublin, Ireland). School of Physics, 2003)
      The work presented in this thesis is based on experimental measurements of nonlinear optical extinction or optical limiting of nanosecond laser pulses by phthalocyanine and polymer-carbon nanotube systems. The nonlinear ...