Search for dissertations about: "Optical Characterisation"
Showing result 11 - 15 of 86 swedish dissertations containing the words Optical Characterisation.
-
11. Surface-normal multiple quantum well electroabsorption modulators : for optical signal processing and asymmetric free-space communication
Abstract : Electroabsorption is the physical phenomenon by which the absorption of light in a medium can be controlled by applying an electric field. The Quantum–Confined Stark Effect, which makes the absorption band–edge in quantum wells very field–dependent, together with the strong absorption peak provided by excitons, are the physical foundations for the success of electroabsorption modulators based on quantum well structures in telecommunication networks. READ MORE
-
12. Bridging Single-Particle Characterisation Gaps of Optical Microscopy in the Nano-Submicron Regime
Abstract : As the practical importance of particles in the nano-submicron size regime continues to increase in both biomedical applications and industrial processes, so does the need for accurate and versatile characterisation methods. Optical scattering microscopy methods are commonly used for single-particle characterisation as they provide quick measurements at physiologically relevant conditions with detection limits reaching down to individual biomolecules. READ MORE
-
13. Time-resolved optical characterisation of defect-rich semiconductors
Abstract : This thesis explores carrier trapping and recombination indefect-rich semiconductors, and methods for materialcharacterisation. Optimal manufacturing parameters areestablished for materials to be used in the ultrafast devicesneeded for future telecommunication applications. READ MORE
-
14. Optical characterisation of subwavelength dielectric particles using particle tracking beyond the Stokes-Einstein relation
Abstract : As the importance of nanoparticles continues to increase in both biology and industrial processes, so does the need for accurate and versatile characterisation methods. However, most light-based methods to quantify size and refractive index of individual particles are either limited to snapshot observations, particles larger than the wavelength of light, non-dynamic particle properties, or assuming the hydrodynamic boundary conditions without experimental evaluation. READ MORE
-
15. Optical Diagnostics of Soot in Combusting Sprays
Abstract : Optical diagnostics in combusting diesel sprays were carried out in the Chalmers High Pressure, High Temperature (HP/HT) spray rig at conditions similar to those in an internal combustion engine, reaching up to 100 bar and 630 ◦ C. Spray development studies and combustion characterisation were done by high speed shadowgraphs that were digitally processed to measure the start of combustion, break-up, droplets and vapour penetration. READ MORE