{"id":{"repo_id":"toronto-retro","oai_identifier":"oai:utoronto.scholaris.ca:1807/82397"},"canonical_url":"https://search.dev.ndltd.org/etd/toronto-retro/oai:utoronto.scholaris.ca:1807/82397","repository":{"repo_id":"toronto-retro","name":"University of Toronto","base_url":"https://utoronto.scholaris.ca/server/oai/request"},"display":{"title":"Efficient Light Coupling Techniques for Integrated Photonics","abstract":"Given the fact that efficient and compact light emitters on a silicon (Si) platform yet do not exist, in most cases, light is still coupled to photonic chips from an external source (i.e. off-chip lasers) through single mode optical fibers (SMF). In this thesis, my investigations are focused on the problem of efficient light coupling to nano-photonic devices of different types. I propose and demonstrate a few compact on-chip solutions to efficiently couple light to specific modes of conventional photonic devices. The size mismatch between an optical fiber mode and the on-chip nano-photonic/plasmonic mode of a photonic circuitry is the major contributing factor to an inefficient fiber-to-chip coupling. Additionally, due to the inherent birefringence of the on-chip waveguides (i.e. silicon-on-insulator waveguides) the coupling efficiencies are also polarization dependent. In this thesis, I propose and demonstrate a compact bilayer inverse taper edge-coupler with enhanced fiber-to-chip coupling efficiencies for both TE and TM polarizations of commercial Si photonic circuitry. The current commercial practice of CMOS-photonics integration is limited to separate fabrication of the respective devices and connecting them by chip-to-chip interconnect systems. In this thesis, I propose and demonstrate a broadside beam routing mechanism in the telecom wavelength using a high index dielectric (i.e. Si) micro-prism structure. I extended the design to an elastic PDMS (Polydimethylsiloxane) platform to achieve beam scanning capability in both telecom and visible wavelength ranges diversifying its applications. I have further extended my work to the field of plasmonics and have designed a compact and highly efficient surface plasmon polariton (SPP) mode excitation scheme at the telecom wavelength regime using a gable shaped Si-tip with an optimized geometry. Fabrication of the Si-tip is compatible with standard Si processes. I have demonstrated the effectivity of the proposed scheme via a proof-of-principal experiment showing the high efficiency excitation of the SPP mode at an Au/SiO2 interface. Furthermore, I present a detailed design of an SPP excitation device capable of efficiently exciting an SPP mode at an Au/air interface, facilitating an easy access to the excited SPP mode from the outside environment, making it more suitable for plasmonic sensing applications.","abstract_html":"Given the fact that efficient and compact light emitters on a silicon (Si) platform yet do not exist, in most cases, light is still coupled to photonic chips from an external source (i.e. off-chip lasers) through single mode optical fibers (SMF). In this thesis, my investigations are focused on the problem of efficient light coupling to nano-photonic devices of different types. I propose and demonstrate a few compact on-chip solutions to efficiently couple light to specific modes of conventional photonic devices. The size mismatch between an optical fiber mode and the on-chip nano-photonic/plasmonic mode of a photonic circuitry is the major contributing factor to an inefficient fiber-to-chip coupling. Additionally, due to the inherent birefringence of the on-chip waveguides (i.e. silicon-on-insulator waveguides) the coupling efficiencies are also polarization dependent. In this thesis, I propose and demonstrate a compact bilayer inverse taper edge-coupler with enhanced fiber-to-chip coupling efficiencies for both TE and TM polarizations of commercial Si photonic circuitry. The current commercial practice of CMOS-photonics integration is limited to separate fabrication of the respective devices and connecting them by chip-to-chip interconnect systems. In this thesis, I propose and demonstrate a broadside beam routing mechanism in the telecom wavelength using a high index dielectric (i.e. Si) micro-prism structure. I extended the design to an elastic PDMS (Polydimethylsiloxane) platform to achieve beam scanning capability in both telecom and visible wavelength ranges diversifying its applications. I have further extended my work to the field of plasmonics and have designed a compact and highly efficient surface plasmon polariton (SPP) mode excitation scheme at the telecom wavelength regime using a gable shaped Si-tip with an optimized geometry. Fabrication of the Si-tip is compatible with standard Si processes. I have demonstrated the effectivity of the proposed scheme via a proof-of-principal experiment showing the high efficiency excitation of the SPP mode at an Au/SiO2 interface. Furthermore, I present a detailed design of an SPP excitation device capable of efficiently exciting an SPP mode at an Au/air interface, facilitating an easy access to the excited SPP mode from the outside environment, making it more suitable for plasmonic sensing applications.","abstract_has_math":false,"creators":["Dewanjee, Arnab"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Electrical and Computer Engineering","school":null,"contributors":[],"advisors":["Mojahedi, Mo","Aitchison, J. Stewart"],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-11","date_published":"2017-11","updated_at":"2026-07-27T21:28:16Z","subjects":["Coupling","Edge Coupler","Inverse Taper","Mode Conversion","Surface Plasmon Polariton","Tip Excitatiom"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1807/82397","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Mojahedi, Mo","Aitchison, J. Stewart"]},{"key":"dc:contributor.department","label":"Department","values":["Electrical and Computer Engineering"]},{"key":"dc:creator","label":"Author","values":["Dewanjee, Arnab"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2017-11"]},{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2018-02-09T21:00:15Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2018-02-09T21:00:15Z"]},{"key":"dc:date.issued","label":"Date","values":["2017-11"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Coupling","Edge Coupler","Inverse Taper","Mode Conversion","Surface Plasmon Polariton","Tip Excitatiom"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1807/82397"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Given the fact that efficient and compact light emitters on a silicon (Si) platform yet do not exist, in most cases, light is still coupled to photonic chips from an external source (i.e. off-chip lasers) through single mode optical fibers (SMF). In this thesis, my investigations are focused on the problem of efficient light coupling to nano-photonic devices of different types. I propose and demonstrate a few compact on-chip solutions to efficiently couple light to specific modes of conventional photonic devices. The size mismatch between an optical fiber mode and the on-chip nano-photonic/plasmonic mode of a photonic circuitry is the major contributing factor to an inefficient fiber-to-chip coupling. Additionally, due to the inherent birefringence of the on-chip waveguides (i.e. silicon-on-insulator waveguides) the coupling efficiencies are also polarization dependent. In this thesis, I propose and demonstrate a compact bilayer inverse taper edge-coupler with enhanced fiber-to-chip coupling efficiencies for both TE and TM polarizations of commercial Si photonic circuitry. The current commercial practice of CMOS-photonics integration is limited to separate fabrication of the respective devices and connecting them by chip-to-chip interconnect systems. In this thesis, I propose and demonstrate a broadside beam routing mechanism in the telecom wavelength using a high index dielectric (i.e. Si) micro-prism structure. I extended the design to an elastic PDMS (Polydimethylsiloxane) platform to achieve beam scanning capability in both telecom and visible wavelength ranges diversifying its applications. I have further extended my work to the field of plasmonics and have designed a compact and highly efficient surface plasmon polariton (SPP) mode excitation scheme at the telecom wavelength regime using a gable shaped Si-tip with an optimized geometry. Fabrication of the Si-tip is compatible with standard Si processes. I have demonstrated the effectivity of the proposed scheme via a proof-of-principal experiment showing the high efficiency excitation of the SPP mode at an Au/SiO2 interface. Furthermore, I present a detailed design of an SPP excitation device capable of efficiently exciting an SPP mode at an Au/air interface, facilitating an easy access to the excited SPP mode from the outside environment, making it more suitable for plasmonic sensing applications."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Ph.D."]},{"key":"dc:title","label":"Title","values":["Efficient Light Coupling Techniques for Integrated Photonics"]}]}],"canonical_facts":{"dc:contributor.advisor":["Mojahedi, Mo","Aitchison, J. Stewart"],"dc:contributor.department":["Electrical and Computer Engineering"],"dc:creator":["Dewanjee, Arnab"],"dc:date":["2017-11"],"dc:date.accessioned":["2018-02-09T21:00:15Z"],"dc:date.available":["2018-02-09T21:00:15Z"],"dc:date.issued":["2017-11"],"dc:description.abstract":["Given the fact that efficient and compact light emitters on a silicon (Si) platform yet do not exist, in most cases, light is still coupled to photonic chips from an external source (i.e. off-chip lasers) through single mode optical fibers (SMF). In this thesis, my investigations are focused on the problem of efficient light coupling to nano-photonic devices of different types. I propose and demonstrate a few compact on-chip solutions to efficiently couple light to specific modes of conventional photonic devices. The size mismatch between an optical fiber mode and the on-chip nano-photonic/plasmonic mode of a photonic circuitry is the major contributing factor to an inefficient fiber-to-chip coupling. Additionally, due to the inherent birefringence of the on-chip waveguides (i.e. silicon-on-insulator waveguides) the coupling efficiencies are also polarization dependent. In this thesis, I propose and demonstrate a compact bilayer inverse taper edge-coupler with enhanced fiber-to-chip coupling efficiencies for both TE and TM polarizations of commercial Si photonic circuitry. The current commercial practice of CMOS-photonics integration is limited to separate fabrication of the respective devices and connecting them by chip-to-chip interconnect systems. In this thesis, I propose and demonstrate a broadside beam routing mechanism in the telecom wavelength using a high index dielectric (i.e. Si) micro-prism structure. I extended the design to an elastic PDMS (Polydimethylsiloxane) platform to achieve beam scanning capability in both telecom and visible wavelength ranges diversifying its applications. I have further extended my work to the field of plasmonics and have designed a compact and highly efficient surface plasmon polariton (SPP) mode excitation scheme at the telecom wavelength regime using a gable shaped Si-tip with an optimized geometry. Fabrication of the Si-tip is compatible with standard Si processes. I have demonstrated the effectivity of the proposed scheme via a proof-of-principal experiment showing the high efficiency excitation of the SPP mode at an Au/SiO2 interface. Furthermore, I present a detailed design of an SPP excitation device capable of efficiently exciting an SPP mode at an Au/air interface, facilitating an easy access to the excited SPP mode from the outside environment, making it more suitable for plasmonic sensing applications."],"dc:description.degree":["Ph.D."],"dc:identifier.uri":["http://hdl.handle.net/1807/82397"],"dc:subject":["Coupling","Edge Coupler","Inverse Taper","Mode Conversion","Surface Plasmon Polariton","Tip Excitatiom"],"dc:title":["Efficient Light Coupling Techniques for Integrated Photonics"],"dc:type":["Thesis"]},"updated_at":"2026-07-27T21:28:16Z"}