Item – Theses Canada

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OCLC number
1019488834
Link(s) to full text
LAC copy
Author
Wong, Herman M. K.
Title
Extending Plasmonics in Semiconductors to Higher Operating Frequencies.
Degree
M.A. Sc. -- University of Toronto, 2011
Publisher
Ottawa : Library and Archives Canada = Bibliothèque et Archives Canada, 2012.
Description
1 online resource
Notes
Includes bibliographical references.
Abstract
<?Pub Inc> This thesis examines the feasibility of using conventional semiconductors, specifically 'GaAs', as a plasmonic material at the operating wavelength of 1550nm, due to its many merits such as achievable low losses and mature micro-fabrication technologies. A theoretical study is performed on 'GaAs' that yielded the condition for plasmonic behaviour at a minimum free carrier density of 7.2 * 1020' cm'-3 in bulk materials. The most feasible route to achieving this condition is determined to be intense optical excitation, and the required intensity considering a 150'fs' pulse at the above bandgap wavelength of 870nm is approximately 2.55TW/'cm' 2. A Bragg reflection ridge waveguide (BRW) using 'GaAs-AlGaAs ' is designed and micro-fabricated, and a counter-propagating pump-probe experiment is devised to test the plasmonic effect using the BRW. Results from two different ultrafast lasers include the observation of pump (870nm and 800nm) coupling to fundamental Bragg modes, and the measurement of the pump transmission spectrum.
ISBN
9780494761564
0494761563