{"id":{"repo_id":"colostate","oai_identifier":"oai:mountainscholar.org:10217/234629"},"canonical_url":"https://search.dev.ndltd.org/etd/colostate/oai:mountainscholar.org:10217/234629","repository":{"repo_id":"colostate","name":"Colorado State University","base_url":"https://api.mountainscholar.org/server/oai/request"},"display":{"title":"Thin film integrated optical waveguides for biosensing using local evanescent field detection","abstract":"A waveguide is a high refractive index material that is surrounded by lower refractive index cladding. This waveguide structure can be used to carry light confined to the high refractive index core. Surrounding the core of the waveguide is a decaying evanescent light field that extends into the cladding layers. The intensity profile of the evanescent field is dependent on the refractive index of the cladding. The changes in the local intensity of the evanescent field can be used to detect refractive index changes near the core of the waveguide. A high refractive index film deposited on a flat, low refractive index .substrate can be used to form a waveguide with a planar geometry. The planar design allows the upper cladding refractive index to be modified by attaching proteins or patterning organic films. This design also allows the evanescent field intensity to be measured using near field scanning optical microscopy or a silicon photo detector array. The fabrication and characterization of a waveguide device with a coupled light source was accomplished. The evanescent field response to thin films of patterned photoresist was found using NSOM. Light intensity measured at the surface of the .sample showed significant response to the presence of the photoresist features. Light response to a protein affinity assay was found and results indicated that protein concentration could be inferred from local evanescent field measurements. A buried silicon photo detector was fabricated and characterized. The results show the field responds in a significant matter to uniform and pattered features on the waveguide core.","abstract_html":"A waveguide is a high refractive index material that is surrounded by lower refractive index cladding. This waveguide structure can be used to carry light confined to the high refractive index core. Surrounding the core of the waveguide is a decaying evanescent light field that extends into the cladding layers. The intensity profile of the evanescent field is dependent on the refractive index of the cladding. The changes in the local intensity of the evanescent field can be used to detect refractive index changes near the core of the waveguide. A high refractive index film deposited on a flat, low refractive index .substrate can be used to form a waveguide with a planar geometry. The planar design allows the upper cladding refractive index to be modified by attaching proteins or patterning organic films. This design also allows the evanescent field intensity to be measured using near field scanning optical microscopy or a silicon photo detector array. The fabrication and characterization of a waveguide device with a coupled light source was accomplished. The evanescent field response to thin films of patterned photoresist was found using NSOM. Light intensity measured at the surface of the .sample showed significant response to the presence of the photoresist features. Light response to a protein affinity assay was found and results indicated that protein concentration could be inferred from local evanescent field measurements. A buried silicon photo detector was fabricated and characterized. The results show the field responds in a significant matter to uniform and pattered features on the waveguide core.","abstract_has_math":false,"creators":["Stephens, Matthew David, author","Dandy, David, advisor","Lear, Kevin, committee member","Reardon, Kenneth, committee member","Belfiore, Laurence, committee member"],"institution":"Colorado State University. Libraries","degree_name":"Doctor of Philosophy (Ph.D.)","degree_level":"Doctoral","degree_discipline":"Chemical and Biological Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2010,"date_issued":"2010","date_published":"2010","updated_at":"2026-07-27T19:13:11Z","subjects":["Optical wave guides","Thin films","Biosensors"],"languages":["eng","English"],"rights":["Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://doi.org/10.25675/3.018695"],"render_values":[{"text":"https://doi.org/10.25675/3.018695","href":"https://doi.org/10.25675/3.018695","code":true}]}]},"links":{"outbound_url":"https://hdl.handle.net/10217/234629","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Stephens, Matthew David, author","Dandy, David, advisor","Lear, Kevin, committee member","Reardon, Kenneth, committee member","Belfiore, Laurence, committee member"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2022-04-07T17:37:18Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2022-04-07T17:37:18Z"]},{"key":"dc:date.issued","label":"Date","values":["2010"]},{"key":"dc:publisher","label":"Institution","values":["Colorado State University. 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User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/10217/234629","https://doi.org/10.25675/3.018695"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Covers not scanned."]},{"key":"dc:description.abstract","label":"Abstract","values":["A waveguide is a high refractive index material that is surrounded by lower refractive index cladding. This waveguide structure can be used to carry light confined to the high refractive index core. Surrounding the core of the waveguide is a decaying evanescent light field that extends into the cladding layers. The intensity profile of the evanescent field is dependent on the refractive index of the cladding. The changes in the local intensity of the evanescent field can be used to detect refractive index changes near the core of the waveguide. A high refractive index film deposited on a flat, low refractive index .substrate can be used to form a waveguide with a planar geometry. The planar design allows the upper cladding refractive index to be modified by attaching proteins or patterning organic films. This design also allows the evanescent field intensity to be measured using near field scanning optical microscopy or a silicon photo detector array. The fabrication and characterization of a waveguide device with a coupled light source was accomplished. The evanescent field response to thin films of patterned photoresist was found using NSOM. Light intensity measured at the surface of the .sample showed significant response to the presence of the photoresist features. Light response to a protein affinity assay was found and results indicated that protein concentration could be inferred from local evanescent field measurements. A buried silicon photo detector was fabricated and characterized. The results show the field responds in a significant matter to uniform and pattered features on the waveguide core."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["doctoral dissertations"]},{"key":"dc:title","label":"Title","values":["Thin film integrated optical waveguides for biosensing using local evanescent field detection"]}]}],"canonical_facts":{"dc:creator":["Stephens, Matthew David, author","Dandy, David, advisor","Lear, Kevin, committee member","Reardon, Kenneth, committee member","Belfiore, Laurence, committee member"],"dc:date.accessioned":["2022-04-07T17:37:18Z"],"dc:date.available":["2022-04-07T17:37:18Z"],"dc:date.issued":["2010"],"dc:description":["Covers not scanned."],"dc:description.abstract":["A waveguide is a high refractive index material that is surrounded by lower refractive index cladding. This waveguide structure can be used to carry light confined to the high refractive index core. Surrounding the core of the waveguide is a decaying evanescent light field that extends into the cladding layers. The intensity profile of the evanescent field is dependent on the refractive index of the cladding. The changes in the local intensity of the evanescent field can be used to detect refractive index changes near the core of the waveguide. A high refractive index film deposited on a flat, low refractive index .substrate can be used to form a waveguide with a planar geometry. The planar design allows the upper cladding refractive index to be modified by attaching proteins or patterning organic films. This design also allows the evanescent field intensity to be measured using near field scanning optical microscopy or a silicon photo detector array. The fabrication and characterization of a waveguide device with a coupled light source was accomplished. The evanescent field response to thin films of patterned photoresist was found using NSOM. Light intensity measured at the surface of the .sample showed significant response to the presence of the photoresist features. Light response to a protein affinity assay was found and results indicated that protein concentration could be inferred from local evanescent field measurements. A buried silicon photo detector was fabricated and characterized. The results show the field responds in a significant matter to uniform and pattered features on the waveguide core."],"dc:format.medium":["doctoral dissertations"],"dc:identifier.uri":["https://hdl.handle.net/10217/234629","https://doi.org/10.25675/3.018695"],"dc:language":["English"],"dc:language.iso":["eng"],"dc:publisher":["Colorado State University. Libraries"],"dc:relation":["Catalog record number (MMS ID): 991014246779703361","TA1800 .S645 2010"],"dc:rights":["Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. 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