May, Robert K.
The Development of Quasi-Optical Techniques for Log Wavelength Imaging.
PhD thesis, National University of Ireland Maynooth.
This thesis concerns the development of quasi-optical techniques for long-wavelength
imaging, which was conducted through a combination of experimentation and computer
simulation. This work was conducted as part of a SFI-funded research program
undertaken by the THz Optics group of the Department of Experimental Physics at NUI
Maynooth, the aim of which was to extend existing quasi-optical techniques through
experimental measurements and the development of simulation tools necessary for
efficient design and analysis of long-wavelength optical systems.
Description of the upgrading of the 100 GHz test measurement facilities at
NUIM and the results obtained from transmission- and reflection-mode active imaging
experiments are presented. Numerical simulation of quasi-optical components and
systems using scalar wave diffraction techniques was performed. In particular, Gaussian
Beam Mode Analysis (GBMA) was applied to the design and analysis of discrete and
continuous phase modulating optical multiplexers (phase gratings) for use at 100 GHz.
The use of GBMA for iterative phase retrieval was investigated for application to phase
grating design. Several phase unwrapping techniques were also investigated in order to
simplify manufacture of phase gratings with difficult-to-fabricate profiles. Results of
experimental measurements from a number of test gratings are presented and verified
using the Maynooth Optical Design and Analysis Laboratory (MODAL) software
package. Further improvements to phase grating design are also presented.
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