The doctoral dissertations of the former Helsinki University of Technology (TKK) and Aalto University Schools of Technology (CHEM, ELEC, ENG, SCI) published in electronic format are available in the electronic publications archive of Aalto University - Aaltodoc.
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Dissertation for the degree of Doctor of Science in Technology to be presented with due permission for public examination and debate in Auditorium F1 at Helsinki University of Technology (Espoo, Finland) on the 22nd of April, 2003, at 12 o'clock noon.
Overview in PDF format (ISBN 951-22-6448-X) [2297 KB]
Dissertation is also available in print (ISBN 951-22-6447-1)
Microscopic spherical silica particles, as small as 0.1 mm in diameter, can function as optical whispering-gallery-mode resonators supporting Q-values of 108 and beyond. Such enormously high quality factors represent unique performance characteristics: an extremely narrow resonant linewidth, long decay time and a high energy density. Envisioned uses for these miniature high-Q resonators include, for example, cavity-QED experimentation, detection and sensing, frequency stabilization, and optical filtering functions.
Until recently, the primary obstacle discouraging applications-oriented development of microsphere resonators has been the fundamental novelty of the various fabrication and handling processes involved – especially in the construction of the advanced optical couplers necessary for efficient sphere mode excitation. In this thesis, novel coupler designs and fabrication methods are presented. New microsphere resonator applications are demonstrated as well, including a narrow-band wavelength-drop device and an acceleration sensor. The most important invention is the antiresonant waveguide coupler, SPARROW, which allows inexpensive and consistent wafer-based fabrication of very efficient microsphere coupling tools.
This thesis consists of an overview and of the following 7 publications:
Keywords: microsphere, optical resonator, whispering-gallery mode
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© 2003 Helsinki University of Technology