{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/24336"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/24336","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Nonlinear optical emission and near-field enhancement effects in arrays of gold bowtie nano-antennas","abstract":"This thesis investigates the effects of the large near-field intensity enhancements from periodic arrays of gold bowtie nano-antennas (BNAs) after illumination by laser light. Specifically, we focus on laser-induced damage, nonlinear optical emission, and a proof-of-concept for utilizing arrays of gold BNAs to enhance the forces in an optical trapping system. From FDTD simulations, the optical response of a single BNA is demonstrated to increase the local intensity by a factor of 1000 in the feed-gap region by using a periodic array. Because of the high near-field intensities, inherently weak nonlinear optical processes become enhanced, and we take advantage of these favorable conditions to investigate the dependence of second-harmonic generation and two-photon photoluminescence emission intensities with respect to the array periodicity and the incident polarization. A detrimental side-effect of the efficient radiative coupling to the incident light and high near-field intensities is laser-induced damage, which may alter the morphology of the BNA structures at sufficiently high laser fluences. A damage threshold is systematically determined in terms of irradiation time and average incident power after implementation of damage reduction measures including laser pulse-width optimization, a stochastic beam-scanning pattern, and the use of a chromium adhesion layer. Finally, the increased optical forces in a trapping system resulting from the field enhancement of arrays of BNAs is demonstrated. In addition, based on the exclusive behaviors of these types of systems, a new method of characterizing plasmonically enhanced optical traps is proposed.","abstract_html":"This thesis investigates the effects of the large near-field intensity enhancements from periodic arrays of gold bowtie nano-antennas (BNAs) after illumination by laser light. Specifically, we focus on laser-induced damage, nonlinear optical emission, and a proof-of-concept for utilizing arrays of gold BNAs to enhance the forces in an optical trapping system. From FDTD simulations, the optical response of a single BNA is demonstrated to increase the local intensity by a factor of 1000 in the feed-gap region by using a periodic array. Because of the high near-field intensities, inherently weak nonlinear optical processes become enhanced, and we take advantage of these favorable conditions to investigate the dependence of second-harmonic generation and two-photon photoluminescence emission intensities with respect to the array periodicity and the incident polarization. A detrimental side-effect of the efficient radiative coupling to the incident light and high near-field intensities is laser-induced damage, which may alter the morphology of the BNA structures at sufficiently high laser fluences. A damage threshold is systematically determined in terms of irradiation time and average incident power after implementation of damage reduction measures including laser pulse-width optimization, a stochastic beam-scanning pattern, and the use of a chromium adhesion layer. Finally, the increased optical forces in a trapping system resulting from the field enhancement of arrays of BNAs is demonstrated. In addition, based on the exclusive behaviors of these types of systems, a new method of characterizing plasmonically enhanced optical traps is proposed.","abstract_has_math":false,"creators":["Ko, Kaspar D."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Toussaint, Kimani C."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-25T14:53:34Z","date_published":"2011-05-25T14:53:34Z","updated_at":"2026-07-22T22:25:23Z","subjects":["optics","photonics near-field enhancement","field enhancement","field confinement","nano-antenna","nanophotonics","laser-induced damage","plasmonically enhanced optical trap","optical tweezers","second-harmonic generation","gold nanostructure","two-photon photoluminescence","supercontinuum generation","bowtie nano-antenna","periodic arrays","array effect","resonant enhancement","trampolining","trapping regime","nano-dimers","coupled-plasmon resonant-nanoparticle pair geometry"],"languages":["en"],"rights":["Copyright 2011 Kaspar D. Ko"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/24336","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Toussaint, Kimani C."]},{"key":"dc:creator","label":"Author","values":["Ko, Kaspar D."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-25T14:53:34Z","2011-05"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["optics","photonics near-field enhancement","field enhancement","field confinement","nano-antenna","nanophotonics","laser-induced damage","plasmonically enhanced optical trap","optical tweezers","second-harmonic generation","gold nanostructure","two-photon photoluminescence","supercontinuum generation","bowtie nano-antenna","periodic arrays","array effect","resonant enhancement","trampolining","trapping regime","nano-dimers","coupled-plasmon resonant-nanoparticle pair geometry"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2011 Kaspar D. Ko"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/24336"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This thesis investigates the effects of the large near-field intensity enhancements from periodic arrays of gold bowtie nano-antennas (BNAs) after illumination by laser light. Specifically, we focus on laser-induced damage, nonlinear optical emission, and a proof-of-concept for utilizing arrays of gold BNAs to enhance the forces in an optical trapping system. From FDTD simulations, the optical response of a single BNA is demonstrated to increase the local intensity by a factor of 1000 in the feed-gap region by using a periodic array. Because of the high near-field intensities, inherently weak nonlinear optical processes become enhanced, and we take advantage of these favorable conditions to investigate the dependence of second-harmonic generation and two-photon photoluminescence emission intensities with respect to the array periodicity and the incident polarization. A detrimental side-effect of the efficient radiative coupling to the incident light and high near-field intensities is laser-induced damage, which may alter the morphology of the BNA structures at sufficiently high laser fluences. A damage threshold is systematically determined in terms of irradiation time and average incident power after implementation of damage reduction measures including laser pulse-width optimization, a stochastic beam-scanning pattern, and the use of a chromium adhesion layer. Finally, the increased optical forces in a trapping system resulting from the field enhancement of arrays of BNAs is demonstrated. In addition, based on the exclusive behaviors of these types of systems, a new method of characterizing plasmonically enhanced optical traps is proposed.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-04-29T18:44:10Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Ko_Kaspar_LatexBuild.tex: 6217 bytes, checksum: f5ef29a7df37f2c35cffaef85f4296b9 (MD5) Ko_Kaspar.pdf: 20008263 bytes, checksum: 43512054661bbd47f02bb5c78c3e58e6 (MD5)","Made available in DSpace on 2011-05-25T14:53:34Z (GMT). No. of bitstreams: 3 Ko_Kaspar.pdf: 20008263 bytes, checksum: 43512054661bbd47f02bb5c78c3e58e6 (MD5) license.txt: 4056 bytes, checksum: cdb629e9197e97b7daafb2aa87305bd8 (MD5) Ko_Kaspar_LatexBuild.tex: 6217 bytes, checksum: f5ef29a7df37f2c35cffaef85f4296b9 (MD5)"]},{"key":"dc:title","label":"Title","values":["Nonlinear optical emission and near-field enhancement effects in arrays of gold bowtie nano-antennas"]}]}],"canonical_facts":{"dc:contributor":["Toussaint, Kimani C."],"dc:creator":["Ko, Kaspar D."],"dc:date":["2011-05-25T14:53:34Z","2011-05"],"dc:description":["This thesis investigates the effects of the large near-field intensity enhancements from periodic arrays of gold bowtie nano-antennas (BNAs) after illumination by laser light. Specifically, we focus on laser-induced damage, nonlinear optical emission, and a proof-of-concept for utilizing arrays of gold BNAs to enhance the forces in an optical trapping system. From FDTD simulations, the optical response of a single BNA is demonstrated to increase the local intensity by a factor of 1000 in the feed-gap region by using a periodic array. Because of the high near-field intensities, inherently weak nonlinear optical processes become enhanced, and we take advantage of these favorable conditions to investigate the dependence of second-harmonic generation and two-photon photoluminescence emission intensities with respect to the array periodicity and the incident polarization. A detrimental side-effect of the efficient radiative coupling to the incident light and high near-field intensities is laser-induced damage, which may alter the morphology of the BNA structures at sufficiently high laser fluences. A damage threshold is systematically determined in terms of irradiation time and average incident power after implementation of damage reduction measures including laser pulse-width optimization, a stochastic beam-scanning pattern, and the use of a chromium adhesion layer. Finally, the increased optical forces in a trapping system resulting from the field enhancement of arrays of BNAs is demonstrated. In addition, based on the exclusive behaviors of these types of systems, a new method of characterizing plasmonically enhanced optical traps is proposed.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-04-29T18:44:10Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Ko_Kaspar_LatexBuild.tex: 6217 bytes, checksum: f5ef29a7df37f2c35cffaef85f4296b9 (MD5) Ko_Kaspar.pdf: 20008263 bytes, checksum: 43512054661bbd47f02bb5c78c3e58e6 (MD5)","Made available in DSpace on 2011-05-25T14:53:34Z (GMT). No. of bitstreams: 3 Ko_Kaspar.pdf: 20008263 bytes, checksum: 43512054661bbd47f02bb5c78c3e58e6 (MD5) license.txt: 4056 bytes, checksum: cdb629e9197e97b7daafb2aa87305bd8 (MD5) Ko_Kaspar_LatexBuild.tex: 6217 bytes, checksum: f5ef29a7df37f2c35cffaef85f4296b9 (MD5)"],"dc:identifier":["http://hdl.handle.net/2142/24336"],"dc:language":["en"],"dc:rights":["Copyright 2011 Kaspar D. Ko"],"dc:subject":["optics","photonics near-field enhancement","field enhancement","field confinement","nano-antenna","nanophotonics","laser-induced damage","plasmonically enhanced optical trap","optical tweezers","second-harmonic generation","gold nanostructure","two-photon photoluminescence","supercontinuum generation","bowtie nano-antenna","periodic arrays","array effect","resonant enhancement","trampolining","trapping regime","nano-dimers","coupled-plasmon resonant-nanoparticle pair geometry"],"dc:title":["Nonlinear optical emission and near-field enhancement effects in arrays of gold bowtie nano-antennas"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:23Z"}