{"id":{"repo_id":"toronto-retro","oai_identifier":"oai:utoronto.scholaris.ca:1807/68356"},"canonical_url":"https://search.dev.ndltd.org/etd/toronto-retro/oai:utoronto.scholaris.ca:1807/68356","repository":{"repo_id":"toronto-retro","name":"University of Toronto","base_url":"https://utoronto.scholaris.ca/server/oai/request"},"display":{"title":"Sub-Diffraction Imaging using Superoscillatory Electromagnetic Waves","abstract":"This thesis presents an investigation on imaging beyond the diffraction limit with superoscillatory electromagnetic waves. It begins with a survey on sub-diffraction imaging, which motivates the need for a new sub-diffraction imaging device which is free from drawbacks in devices which have heretofore been proposed. This work addresses this need through the design and demonstration of superoscillatory wave-based focusing and imaging devices. Through establishing a relationship between superoscillation and superdirectivity, a design procedure is formulated whereby antenna array theory is leveraged to design 1D and 2D superoscillatory waves. These waves are then physically synthesized or implemented as a filter in focusing and imaging systems at frequencies ranging from microwave to optical. Experimental characterization of these systems has led to successful demonstrations of sub-diffraction focusing and imaging, with working distances orders of magnitude farther than most other electromagnetic wave-based sub-diffraction imaging devices. In particular, the Optical Super-Microscope which achieves far-field sub-diffraction focusing has attractive merits to become a tool for general-purpose sub-diffraction optical microscopy. An investigation has also been conducted on superoscillatory waves in the time domain, which has resulted in the first reported demonstration of a superoscillatory temporal waveform, as well as a demonstrated improvement of radar range resolution beyond the Fourier transform limit.","abstract_html":"This thesis presents an investigation on imaging beyond the diffraction limit with superoscillatory electromagnetic waves. It begins with a survey on sub-diffraction imaging, which motivates the need for a new sub-diffraction imaging device which is free from drawbacks in devices which have heretofore been proposed. This work addresses this need through the design and demonstration of superoscillatory wave-based focusing and imaging devices. Through establishing a relationship between superoscillation and superdirectivity, a design procedure is formulated whereby antenna array theory is leveraged to design 1D and 2D superoscillatory waves. These waves are then physically synthesized or implemented as a filter in focusing and imaging systems at frequencies ranging from microwave to optical. Experimental characterization of these systems has led to successful demonstrations of sub-diffraction focusing and imaging, with working distances orders of magnitude farther than most other electromagnetic wave-based sub-diffraction imaging devices. In particular, the Optical Super-Microscope which achieves far-field sub-diffraction focusing has attractive merits to become a tool for general-purpose sub-diffraction optical microscopy. An investigation has also been conducted on superoscillatory waves in the time domain, which has resulted in the first reported demonstration of a superoscillatory temporal waveform, as well as a demonstrated improvement of radar range resolution beyond the Fourier transform limit.","abstract_has_math":false,"creators":["Wong, Man Hon Alex"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Electrical and Computer Engineering","school":null,"contributors":[],"advisors":["Eleftheriades, V. George"],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-06","date_published":"2014-06","updated_at":"2026-07-27T21:27:52Z","subjects":["Antenna Arrays","Electromagnetics","Imaging","Microscopy","Superoscillation","Superresolution"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1807/68356","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Eleftheriades, V. 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It begins with a survey on sub-diffraction imaging, which motivates the need for a new sub-diffraction imaging device which is free from drawbacks in devices which have heretofore been proposed. This work addresses this need through the design and demonstration of superoscillatory wave-based focusing and imaging devices. Through establishing a relationship between superoscillation and superdirectivity, a design procedure is formulated whereby antenna array theory is leveraged to design 1D and 2D superoscillatory waves. These waves are then physically synthesized or implemented as a filter in focusing and imaging systems at frequencies ranging from microwave to optical. Experimental characterization of these systems has led to successful demonstrations of sub-diffraction focusing and imaging, with working distances orders of magnitude farther than most other electromagnetic wave-based sub-diffraction imaging devices. In particular, the Optical Super-Microscope which achieves far-field sub-diffraction focusing has attractive merits to become a tool for general-purpose sub-diffraction optical microscopy. An investigation has also been conducted on superoscillatory waves in the time domain, which has resulted in the first reported demonstration of a superoscillatory temporal waveform, as well as a demonstrated improvement of radar range resolution beyond the Fourier transform limit."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Ph.D."]},{"key":"dc:title","label":"Title","values":["Sub-Diffraction Imaging using Superoscillatory Electromagnetic Waves"]}]}],"canonical_facts":{"dc:contributor.advisor":["Eleftheriades, V. George"],"dc:contributor.department":["Electrical and Computer Engineering"],"dc:creator":["Wong, Man Hon Alex"],"dc:date.accessioned":["2015-04-24T17:05:18Z"],"dc:date.available":["2015-04-24T17:05:18Z"],"dc:date.issued":["2014-06"],"dc:description.abstract":["This thesis presents an investigation on imaging beyond the diffraction limit with superoscillatory electromagnetic waves. It begins with a survey on sub-diffraction imaging, which motivates the need for a new sub-diffraction imaging device which is free from drawbacks in devices which have heretofore been proposed. This work addresses this need through the design and demonstration of superoscillatory wave-based focusing and imaging devices. Through establishing a relationship between superoscillation and superdirectivity, a design procedure is formulated whereby antenna array theory is leveraged to design 1D and 2D superoscillatory waves. These waves are then physically synthesized or implemented as a filter in focusing and imaging systems at frequencies ranging from microwave to optical. Experimental characterization of these systems has led to successful demonstrations of sub-diffraction focusing and imaging, with working distances orders of magnitude farther than most other electromagnetic wave-based sub-diffraction imaging devices. In particular, the Optical Super-Microscope which achieves far-field sub-diffraction focusing has attractive merits to become a tool for general-purpose sub-diffraction optical microscopy. 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