{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/116158"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/116158","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Application of picosecond interferometry to characterize physical behavior of crystals","abstract":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms","abstract_html":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms","abstract_has_math":false,"creators":["Mahat, Sushant"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Materials Science & Engr","degree_department":null,"school":null,"contributors":["Cahill, David G","Schleife, Andre","Hoffmann, Axel","Perry, Nicola H"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-08","date_published":"2022-08","updated_at":"2026-07-22T22:24:55Z","subjects":["elastic","photoelastic","tensors","elastic constants"],"languages":["en","eng"],"rights":["Copyright 2022 Sushant Mahat"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/116158","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Cahill, David G","Schleife, Andre","Hoffmann, Axel","Perry, Nicola H"]},{"key":"dc:creator","label":"Author","values":["Mahat, Sushant"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-08","2022-06-28"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Materials Science & 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":["elastic","photoelastic","tensors","elastic constants"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2022 Sushant Mahat"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/116158"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms","The student, Sushant Mahat, accepted the attached license on 2022-06-10 at 11:34.","The student, Sushant Mahat, submitted this Dissertation for approval on 2022-06-10 at 11:50.","This Dissertation was approved for publication on 2022-06-28 at 11:30.","DSpace SAF Submission Ingestion Package generated from Vireo submission #18069 on 2022-11-15 at 17:37:33","Recent development in computational tools have enabled rapid discovery of new materials with highly specialized properties. In contrast, growth and synthesis processes lag behind significantly in terms of high throughput capabilities. Part of the problem in development of new materials is lack of characterization tools capable of accurately mapping different physical properties in grown materials. Most materials development process remain iterative trail-and-error procedures, requiring repeated rounds of growth and characterization before a material is ready for deployment. Having tools capable of providing composition-process-structure-property relation at each iterative step would significantly reduce the trial-and-error nature of these growth characterization cycles, and would generate a lot of materials data. In this dissertation, I develop and improve the picosecond interferometric technique (PI) tool. PI is an optical pump probe technique capable of non-contact characterization using ultrashort laser pulses. Recently, high throughput characterization of thermal properties was made possible using an optical pump probe technique similar to PI. As the PI technique can simultaneously probe different physical properties, it is a strong candidate for development as a high throughput characterization tool. While the primary use of the PI technique has been to characterize thermal and mechanical properties of newly grown thin films, small adjustments and a through study of the system can allow for characterization of many properties of materials grown in many shapes and forms. In this work, I explore the use of picosecond interferometry technique in characterizing the full set of elastic constants and photoelastic constants of semiconducting crystals. I report how the PI tool can be used to calculate the full set of elastic constants and relative photoelastic constants of crystals. Despite being fundamental materials property, full set of elastic and photo elastic constants are not characterized for a lot of materials. Part of the reason for this has been the stringent sample requirements of existing techniques. I show that the sample requirements for PI experiment are relatively simpler and could be performed in a high throughout manner. I also use PI to measure optical attenuation in semiconductors. The useful signal in a PI experiment is generated by Brillouin scattering. Often, it may be difficult to parse accurate material properties from a PI signal. After careful consideration of material properties involved, and the signal generation and detection mechanism in PI, I develop and implement computational tools that can extract material properties from PI experimental results. Although the experimental examples shown in this work deal with cubic crystals, the processes laid out, and the calculation made available should work with materials of any symmetry."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Application of picosecond interferometry to characterize physical behavior of crystals"]}]}],"canonical_facts":{"dc:contributor":["Cahill, David G","Schleife, Andre","Hoffmann, Axel","Perry, Nicola H"],"dc:creator":["Mahat, Sushant"],"dc:date":["2022-08","2022-06-28"],"dc:description":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms","The student, Sushant Mahat, accepted the attached license on 2022-06-10 at 11:34.","The student, Sushant Mahat, submitted this Dissertation for approval on 2022-06-10 at 11:50.","This Dissertation was approved for publication on 2022-06-28 at 11:30.","DSpace SAF Submission Ingestion Package generated from Vireo submission #18069 on 2022-11-15 at 17:37:33","Recent development in computational tools have enabled rapid discovery of new materials with highly specialized properties. In contrast, growth and synthesis processes lag behind significantly in terms of high throughput capabilities. Part of the problem in development of new materials is lack of characterization tools capable of accurately mapping different physical properties in grown materials. Most materials development process remain iterative trail-and-error procedures, requiring repeated rounds of growth and characterization before a material is ready for deployment. Having tools capable of providing composition-process-structure-property relation at each iterative step would significantly reduce the trial-and-error nature of these growth characterization cycles, and would generate a lot of materials data. In this dissertation, I develop and improve the picosecond interferometric technique (PI) tool. PI is an optical pump probe technique capable of non-contact characterization using ultrashort laser pulses. Recently, high throughput characterization of thermal properties was made possible using an optical pump probe technique similar to PI. As the PI technique can simultaneously probe different physical properties, it is a strong candidate for development as a high throughput characterization tool. While the primary use of the PI technique has been to characterize thermal and mechanical properties of newly grown thin films, small adjustments and a through study of the system can allow for characterization of many properties of materials grown in many shapes and forms. In this work, I explore the use of picosecond interferometry technique in characterizing the full set of elastic constants and photoelastic constants of semiconducting crystals. I report how the PI tool can be used to calculate the full set of elastic constants and relative photoelastic constants of crystals. Despite being fundamental materials property, full set of elastic and photo elastic constants are not characterized for a lot of materials. Part of the reason for this has been the stringent sample requirements of existing techniques. I show that the sample requirements for PI experiment are relatively simpler and could be performed in a high throughout manner. I also use PI to measure optical attenuation in semiconductors. The useful signal in a PI experiment is generated by Brillouin scattering. Often, it may be difficult to parse accurate material properties from a PI signal. After careful consideration of material properties involved, and the signal generation and detection mechanism in PI, I develop and implement computational tools that can extract material properties from PI experimental results. Although the experimental examples shown in this work deal with cubic crystals, the processes laid out, and the calculation made available should work with materials of any symmetry."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/116158"],"dc:language":["en","eng"],"dc:rights":["Copyright 2022 Sushant Mahat"],"dc:subject":["elastic","photoelastic","tensors","elastic constants"],"dc:title":["Application of picosecond interferometry to characterize physical behavior of crystals"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Materials Science & Engr"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:55Z"}