No description available.

Thesis (Ph. D.)--University of Washington, 1996. / Vita. Includes bibliographical references (leaves [86]-91).

No description available.

Coplanar microstrip structures placed on dielectric substrates are used as high frequency electro-optic modulators. The method of lines, a mathematical technique for solving partial differential equations, has been applied to solve for the propagation characteristics of such a configuration. It has been determined that simple transmission line models are adequate to describe this system. The propagation characteristics are expressed in terms of the equivalent impedance and the phase velocity of the signal on the microstrip. In order to maximize the effective bandwidth of the modulator, the impedance is matched to that of the surrounding dielectric substrate, and the difference in the phase velocities of the two signals is minimized. The numerical technique developed here allows for the analysis of inhomogeneous dielectric substrates, so that trench structures for tuning the propagation characteristics to their desired values can be modelled. The numerical results for typical structures are presented, and suggest that the method of lines is a viable one for analyzing these modulator structures. / Graduation date: 1991

No description available.

No description available.

Performances of multimedia works are hampered by the difficulty of controlling large numbers of incandescent lamps rapidly and accurately. The instrument described in this document is aimed at alleviating this problem. Chapter I describes the design and operation of the voltage-controlled dimmer unit and the DC controller. Chapter II describes step-by-step procedures for building the instrument. Schematics, wiring diagrams, and illustrative photographs are included. Chapter III discusses some of the aesthetics and philosophy of multimedia composition, and then describes various scenarios which utilize the instrument. Included are the connection of peripheral control equipment, audio/Video interfacing, and the potential for constructing prepared tapes which will automatically drive the dimmers. The prototype was built at the NTSU Electronic Music Center.

Copies of author's previously published articles inserted. / Bibliography: p. 119-129. / xvi, 129, [58] p. : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / This thesis investigated the suitability of liquid crystal spatial light modulators as versatile computer controlled optical elements. The modulation characteristics were determined empirically and experimentally, and their performance as phase modulators tested in the two diverse applications of computer generated holography and phase aberration correction. Commercial liquid crystal panels from a video projector were used, chosen because of low cost, high resolution, computer controlled input, reconfigurability and ready availability. The panels were found to be more suited to amplitude than to phase modulation. Results show that the devices are versatile enough to be adapted to the two very different applications. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physics and Mathematical Physics, 1998

Thesis (Ph.D.)--University of Adelaide, Dept. of Physics and Mathematical Physics, 1998. / Copies of author's previously published articles inserted. Bibliography: p. 119-129.

Thesis (M.S.)--Ohio University, November, 1996. / Title from PDF t.p.