Zone plates are commonly used in soft X-ray microscopy due to the high spatial resolutions achievable, however the performance is somewhat limited due to their small numerical aperture, combined with chromatic aberration and the multiple diffraction orders that are produced. Microstructured Optical Arrays (MOAs) have been proposed as an alternative method of focusing soft X-rays, using grazing incidence reflections from an array of channels, with the cumulative effect producing a small focused spot. The development and focusing properties of MOAs are described and simulated within this thesis, with comparison made to zone plates and other methods of focusing X-rays. -- Experimental characterisation of MOAs and zone plates was achieved using a microfocused electron bombardment X-ray source. Necessary developments required to examine MOAs using the X-ray source and detector system are described, along with current calibration measurements, providing insight into the overall performance of the source. -- The use of a CCD detector with the microfocus source has allowed comparison to be made between experimental measurements made to characterise the optical performance of MOAs and computer simulation.
|Date of Award||Apr 2012|
|Supervisor||Graeme Morrison (Supervisor) & Alan Michette (Supervisor)|