{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/78776"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/78776","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Integrated narrowband guided mode resonance photonic filters for advanced mid-infrared microspectroscopy","abstract":"Characteristic molecular vibrational absorption wavelengths in mid-infrared (mid-IR) have been discovered for various applications, and as a result, a faster summary of an MIR spectrum can be gained by probing a set of discrete spectral fingerprints only, enabling many applications including fast early cancer diagnostics, real-time spectroscopic observation, on-chip chemical sensing, and simple/compact mid-IR instrumentation. In this ‘discrete-frequency infrared’ (DF-IR) spectroscopy approach, there is no Fourier transform infrared (FT-IR) interferometer that continuously scans a spectrum, and acquisition of spectral information can be made rapidly by combining an MIR detector and a tunable single-peak narrowband light source, such as selective thermal emitters, quantum cascade (QC) lasers, or a combination of a broadband incandescent globar and filters. This thesis explores the DF-IR approach by using photonic filtering that is based on guided mode resonance (GMR). First, a useful analytical framework for optimal design of GMR devices is established based on a sound understanding of the underlying physics, and can be used to complement numerical electromagnetic simulations. Then, guided by this judicious design, the thesis presents experimental realization of high-performance GMR filters in the C-H stretching region (3-4 µm or 2500-3300 cm-1) of the mid-IR, and demonstrates GMR-filter-based DF-IR microspectroscopy for the first time. Last but not the least, this thesis introduces a new type of high-refractive-index photonic filter in the challenging but important molecular fingerprint mid-IR (6-10 µm or 1000-1600 cm-1) that shows behaviors distinct from conventional GMR. The combination of the high-index photonic devices and the recently developed QC emitters is proposed as a novel, promising solution to high-quality DF-IR microspectroscopy.","abstract_html":"Characteristic molecular vibrational absorption wavelengths in mid-infrared (mid-IR) have been discovered for various applications, and as a result, a faster summary of an MIR spectrum can be gained by probing a set of discrete spectral fingerprints only, enabling many applications including fast early cancer diagnostics, real-time spectroscopic observation, on-chip chemical sensing, and simple/compact mid-IR instrumentation. In this ‘discrete-frequency infrared’ (DF-IR) spectroscopy approach, there is no Fourier transform infrared (FT-IR) interferometer that continuously scans a spectrum, and acquisition of spectral information can be made rapidly by combining an MIR detector and a tunable single-peak narrowband light source, such as selective thermal emitters, quantum cascade (QC) lasers, or a combination of a broadband incandescent globar and filters. This thesis explores the DF-IR approach by using photonic filtering that is based on guided mode resonance (GMR). First, a useful analytical framework for optimal design of GMR devices is established based on a sound understanding of the underlying physics, and can be used to complement numerical electromagnetic simulations. Then, guided by this judicious design, the thesis presents experimental realization of high-performance GMR filters in the C-H stretching region (3-4 µm or 2500-3300 cm-1) of the mid-IR, and demonstrates GMR-filter-based DF-IR microspectroscopy for the first time. Last but not the least, this thesis introduces a new type of high-refractive-index photonic filter in the challenging but important molecular fingerprint mid-IR (6-10 µm or 1000-1600 cm-1) that shows behaviors distinct from conventional GMR. The combination of the high-index photonic devices and the recently developed QC emitters is proposed as a novel, promising solution to high-quality DF-IR microspectroscopy.","abstract_has_math":false,"creators":["Liu, Jui-Nung"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Electrical & Computer Engr","degree_department":null,"school":null,"contributors":["Cunningham, Brian T.","Bhargava, Rohit","Wasserman, Daniel M.","Liu, Gang Logan"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-07-22T22:45:59Z","date_published":"2015-07-22T22:45:59Z","updated_at":"2026-07-22T22:26:12Z","subjects":["Photonic crystal","Guided resonance","Infrared spectroscopy"],"languages":["en"],"rights":["Copyright 2015 Jui-Nung Liu"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/78776","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Cunningham, Brian T.","Bhargava, Rohit","Wasserman, Daniel M.","Liu, Gang Logan"]},{"key":"dc:creator","label":"Author","values":["Liu, Jui-Nung"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-07-22T22:45:59Z","2017-07-23T09:15:35Z","2015-05","2015-04-24","2015-5"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical & Computer Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"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":["Photonic crystal","Guided resonance","Infrared spectroscopy"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2015 Jui-Nung Liu"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/78776"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Characteristic molecular vibrational absorption wavelengths in mid-infrared (mid-IR) have been discovered for various applications, and as a result, a faster summary of an MIR spectrum can be gained by probing a set of discrete spectral fingerprints only, enabling many applications including fast early cancer diagnostics, real-time spectroscopic observation, on-chip chemical sensing, and simple/compact mid-IR instrumentation. In this ‘discrete-frequency infrared’ (DF-IR) spectroscopy approach, there is no Fourier transform infrared (FT-IR) interferometer that continuously scans a spectrum, and acquisition of spectral information can be made rapidly by combining an MIR detector and a tunable single-peak narrowband light source, such as selective thermal emitters, quantum cascade (QC) lasers, or a combination of a broadband incandescent globar and filters. This thesis explores the DF-IR approach by using photonic filtering that is based on guided mode resonance (GMR). First, a useful analytical framework for optimal design of GMR devices is established based on a sound understanding of the underlying physics, and can be used to complement numerical electromagnetic simulations. Then, guided by this judicious design, the thesis presents experimental realization of high-performance GMR filters in the C-H stretching region (3-4 µm or 2500-3300 cm-1) of the mid-IR, and demonstrates GMR-filter-based DF-IR microspectroscopy for the first time. Last but not the least, this thesis introduces a new type of high-refractive-index photonic filter in the challenging but important molecular fingerprint mid-IR (6-10 µm or 1000-1600 cm-1) that shows behaviors distinct from conventional GMR. The combination of the high-index photonic devices and the recently developed QC emitters is proposed as a novel, promising solution to high-quality DF-IR microspectroscopy.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-05-01","The student, Jui-Nung Liu, accepted the attached license on 2015-04-22 at 17:57.","The student, Jui-Nung Liu, submitted this Dissertation for approval on 2015-04-22 at 18:17.","This Dissertation was approved for publication on 2015-04-24 at 08:28.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8039 on 2015-07-22 at 14:26:20","Made available in DSpace on 2015-07-22T22:45:59Z (GMT). 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Then, guided by this judicious design, the thesis presents experimental realization of high-performance GMR filters in the C-H stretching region (3-4 µm or 2500-3300 cm-1) of the mid-IR, and demonstrates GMR-filter-based DF-IR microspectroscopy for the first time. Last but not the least, this thesis introduces a new type of high-refractive-index photonic filter in the challenging but important molecular fingerprint mid-IR (6-10 µm or 1000-1600 cm-1) that shows behaviors distinct from conventional GMR. The combination of the high-index photonic devices and the recently developed QC emitters is proposed as a novel, promising solution to high-quality DF-IR microspectroscopy.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-05-01","The student, Jui-Nung Liu, accepted the attached license on 2015-04-22 at 17:57.","The student, Jui-Nung Liu, submitted this Dissertation for approval on 2015-04-22 at 18:17.","This Dissertation was approved for publication on 2015-04-24 at 08:28.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8039 on 2015-07-22 at 14:26:20","Made available in DSpace on 2015-07-22T22:45:59Z (GMT). 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