{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/24178"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/24178","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Surface phonon polaritons coupled to the far-field by a grating at high temperature","abstract":"This thesis explores surface phonon polaritons (SPhP) in quartz coupled to the far field by gratings, and the temperature dependence of SPhP coupled to the far field. The subject of coupling SPhP to the far-field has been studied in the past, but not at high temperature. Devices proposed to control radiative heat transfer using SPhP would benefit from an understanding of SPhP temperature dependence. In this thesis we study the effects of geometric grating parameters to optimize the coupling of SPhP to the far-field. The width of the SPhP reflectivity dip depends on the depth of the grating. We study, for several grating depths, the tempertature dependence of SPhP radiation in the temperature range between 300 K and 800 K. For a grating depth of 280 nm, the width of the reflectivity dip in the temperature range 300 < T < 800 K is comparable to what is expected for the SPhP excitations of a flat surface. For a grating depth of 670 nm, the width of the reflectivity dip increases significantly due to coupling to far-field radiation. For both depths the width of the SPhP reflectivity dip increases with increasing temperature and corresponds to the increase of the bulk transverse optical phonon damping.","abstract_html":"This thesis explores surface phonon polaritons (SPhP) in quartz coupled to the far field by gratings, and the temperature dependence of SPhP coupled to the far field. The subject of coupling SPhP to the far-field has been studied in the past, but not at high temperature. Devices proposed to control radiative heat transfer using SPhP would benefit from an understanding of SPhP temperature dependence. In this thesis we study the effects of geometric grating parameters to optimize the coupling of SPhP to the far-field. The width of the SPhP reflectivity dip depends on the depth of the grating. We study, for several grating depths, the tempertature dependence of SPhP radiation in the temperature range between 300 K and 800 K. For a grating depth of 280 nm, the width of the reflectivity dip in the temperature range 300 &lt; T &lt; 800 K is comparable to what is expected for the SPhP excitations of a flat surface. For a grating depth of 670 nm, the width of the reflectivity dip increases significantly due to coupling to far-field radiation. For both depths the width of the SPhP reflectivity dip increases with increasing temperature and corresponds to the increase of the bulk transverse optical phonon damping.","abstract_has_math":false,"creators":["Hafeli, Andrew K."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Materials Science & Engr","degree_department":null,"school":null,"contributors":["Cahill, David G."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-25T15:02:55Z","date_published":"2011-05-25T15:02:55Z","updated_at":"2026-07-22T22:25:23Z","subjects":["quartz","polaritons","surface phonons","diffraction gratings"],"languages":["en"],"rights":["Copyright 2011 Andrew K. Hafeli"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/24178","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Cahill, David G."]},{"key":"dc:creator","label":"Author","values":["Hafeli, Andrew K."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-25T15:02:55Z","2011-05"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Materials Science & Engr"]},{"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":["quartz","polaritons","surface phonons","diffraction gratings"]}]},{"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 Andrew K. Hafeli"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/24178"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This thesis explores surface phonon polaritons (SPhP) in quartz coupled to the far field by gratings, and the temperature dependence of SPhP coupled to the far field. The subject of coupling SPhP to the far-field has been studied in the past, but not at high temperature. Devices proposed to control radiative heat transfer using SPhP would benefit from an understanding of SPhP temperature dependence. In this thesis we study the effects of geometric grating parameters to optimize the coupling of SPhP to the far-field. The width of the SPhP reflectivity dip depends on the depth of the grating. We study, for several grating depths, the tempertature dependence of SPhP radiation in the temperature range between 300 K and 800 K. For a grating depth of 280 nm, the width of the reflectivity dip in the temperature range 300 < T < 800 K is comparable to what is expected for the SPhP excitations of a flat surface. For a grating depth of 670 nm, the width of the reflectivity dip increases significantly due to coupling to far-field radiation. For both depths the width of the SPhP reflectivity dip increases with increasing temperature and corresponds to the increase of the bulk transverse optical phonon damping.","Item withdrawn by Rebecca Bryant (rabryant@illinois.edu) on 2011-04-20T15:32:52Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Masters_Thesis_Hafeli.docx: 13623698 bytes, checksum: 01646dd60c29e750f7492b2385f36f00 (MD5) Masters_Thesis_Hafeli.pdf: 3345555 bytes, checksum: 6b60b681f611aed53a06c4792368bfae (MD5)","Made available in DSpace on 2011-05-25T15:02:55Z (GMT). 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In this thesis we study the effects of geometric grating parameters to optimize the coupling of SPhP to the far-field. The width of the SPhP reflectivity dip depends on the depth of the grating. We study, for several grating depths, the tempertature dependence of SPhP radiation in the temperature range between 300 K and 800 K. For a grating depth of 280 nm, the width of the reflectivity dip in the temperature range 300 < T < 800 K is comparable to what is expected for the SPhP excitations of a flat surface. For a grating depth of 670 nm, the width of the reflectivity dip increases significantly due to coupling to far-field radiation. For both depths the width of the SPhP reflectivity dip increases with increasing temperature and corresponds to the increase of the bulk transverse optical phonon damping.","Item withdrawn by Rebecca Bryant (rabryant@illinois.edu) on 2011-04-20T15:32:52Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Masters_Thesis_Hafeli.docx: 13623698 bytes, checksum: 01646dd60c29e750f7492b2385f36f00 (MD5) Masters_Thesis_Hafeli.pdf: 3345555 bytes, checksum: 6b60b681f611aed53a06c4792368bfae (MD5)","Made available in DSpace on 2011-05-25T15:02:55Z (GMT). No. of bitstreams: 3 Hafeli_Andrew.pdf: 3345555 bytes, checksum: 8011858ae6e3ad89e3f1536604669f55 (MD5) Hafeli_Andrew.docx: 13622964 bytes, checksum: b145d8f20aaac57aa6e66c24ae1d861b (MD5) license.txt: 4062 bytes, checksum: c1a4e687ffb418cef80367dc1a621317 (MD5)"],"dc:identifier":["http://hdl.handle.net/2142/24178"],"dc:language":["en"],"dc:rights":["Copyright 2011 Andrew K. Hafeli"],"dc:subject":["quartz","polaritons","surface phonons","diffraction gratings"],"dc:title":["Surface phonon polaritons coupled to the far-field by a grating at high temperature"],"thesis:degree_discipline":["Materials Science & Engr"],"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"}