{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/109501"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/109501","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Observation of mechanical bound states in the continuum","abstract":"Phonon trapping has raised widespread attention among researchers for its potential of various applications, such as microwave signal processing, interferometric gravitational wave detection and quantum mechanical oscillators. A common way to realize phonon trapping is through suspended structures as phonon transportation relies on medium and cannot permeate through the vacuum, yet it is mostly limited as complete isolation of the system from the environment is not achievable and detection of such systems is typically lagged by thermal capacity and excess noise. To circumvent these limitations, we propose a new cavity-less system based on bound states in the continuum (BICs), which are non-radiative states that can coexist with radiation waves inside the continuum region can offer a platform for realizing phonon trapping without mechanical suspension. In-depth characterization of the acoustic loss mechanisms has been performed both at room temperature and cryogenic temperature. This new paradigm for phonon trapping, combining the macroscopic structure device and microwave frequency, has the potential for realizing the mechanical oscillators in both classical and quantum regimes, as well as the potential for high sensitivity sensing for rare-event searches and the exploration of the foundations of quantum mechanics in unreached parameter spaces.","abstract_html":"Phonon trapping has raised widespread attention among researchers for its potential of various applications, such as microwave signal processing, interferometric gravitational wave detection and quantum mechanical oscillators. A common way to realize phonon trapping is through suspended structures as phonon transportation relies on medium and cannot permeate through the vacuum, yet it is mostly limited as complete isolation of the system from the environment is not achievable and detection of such systems is typically lagged by thermal capacity and excess noise. To circumvent these limitations, we propose a new cavity-less system based on bound states in the continuum (BICs), which are non-radiative states that can coexist with radiation waves inside the continuum region can offer a platform for realizing phonon trapping without mechanical suspension. In-depth characterization of the acoustic loss mechanisms has been performed both at room temperature and cryogenic temperature. This new paradigm for phonon trapping, combining the macroscopic structure device and microwave frequency, has the potential for realizing the mechanical oscillators in both classical and quantum regimes, as well as the potential for high sensitivity sensing for rare-event searches and the exploration of the foundations of quantum mechanics in unreached parameter spaces.","abstract_has_math":false,"creators":["Tong, Hao"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Electrical & Computer Engr","degree_department":null,"school":null,"contributors":["Fang, Kejie"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2021,"date_issued":"2021-03-05T21:40:46Z","date_published":"2021-03-05T21:40:46Z","updated_at":"2026-07-22T22:24:50Z","subjects":["Bound state in the continuum","Phononic crystal"],"languages":["en"],"rights":["Copyright 2020 Hao Tong"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/109501","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Fang, Kejie"]},{"key":"dc:creator","label":"Author","values":["Tong, Hao"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2021-03-05T21:40:46Z","2023-03-05T21:43:00Z","2020-11-22","2020-12"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical & Computer 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":["Bound state in the continuum","Phononic crystal"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2020 Hao Tong"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/109501"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Phonon trapping has raised widespread attention among researchers for its potential of various applications, such as microwave signal processing, interferometric gravitational wave detection and quantum mechanical oscillators. A common way to realize phonon trapping is through suspended structures as phonon transportation relies on medium and cannot permeate through the vacuum, yet it is mostly limited as complete isolation of the system from the environment is not achievable and detection of such systems is typically lagged by thermal capacity and excess noise. To circumvent these limitations, we propose a new cavity-less system based on bound states in the continuum (BICs), which are non-radiative states that can coexist with radiation waves inside the continuum region can offer a platform for realizing phonon trapping without mechanical suspension. In-depth characterization of the acoustic loss mechanisms has been performed both at room temperature and cryogenic temperature. This new paradigm for phonon trapping, combining the macroscopic structure device and microwave frequency, has the potential for realizing the mechanical oscillators in both classical and quantum regimes, as well as the potential for high sensitivity sensing for rare-event searches and the exploration of the foundations of quantum mechanics in unreached parameter spaces.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2022-12-01","The student, Hao Tong, accepted the attached license on 2020-11-20 at 15:45.","The student, Hao Tong, submitted this Thesis for approval on 2020-11-20 at 15:54.","This Thesis was approved for publication on 2020-11-22 at 17:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15925 on 2021-03-04 at 16:19:42","Made available in DSpace on 2021-03-05T21:40:46Z (GMT). No. of bitstreams: 2 TONG-THESIS-2020.pdf: 23367784 bytes, checksum: 715e13504af7f5ddd75a710233a9946c (MD5) LICENSE.txt: 4205 bytes, checksum: 259916117b4fc2f306ba7f27e9f23f2d (MD5) Previous issue date: 2020-11-22","Embargo set by: Seth Robbins for item 117205 Lift date: 2023-03-05T21:40:52Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 117205 Lift date: 2023-03-05T21:43:00Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Observation of mechanical bound states in the continuum"]}]}],"canonical_facts":{"dc:contributor":["Fang, Kejie"],"dc:creator":["Tong, Hao"],"dc:date":["2021-03-05T21:40:46Z","2023-03-05T21:43:00Z","2020-11-22","2020-12"],"dc:description":["Phonon trapping has raised widespread attention among researchers for its potential of various applications, such as microwave signal processing, interferometric gravitational wave detection and quantum mechanical oscillators. A common way to realize phonon trapping is through suspended structures as phonon transportation relies on medium and cannot permeate through the vacuum, yet it is mostly limited as complete isolation of the system from the environment is not achievable and detection of such systems is typically lagged by thermal capacity and excess noise. To circumvent these limitations, we propose a new cavity-less system based on bound states in the continuum (BICs), which are non-radiative states that can coexist with radiation waves inside the continuum region can offer a platform for realizing phonon trapping without mechanical suspension. In-depth characterization of the acoustic loss mechanisms has been performed both at room temperature and cryogenic temperature. This new paradigm for phonon trapping, combining the macroscopic structure device and microwave frequency, has the potential for realizing the mechanical oscillators in both classical and quantum regimes, as well as the potential for high sensitivity sensing for rare-event searches and the exploration of the foundations of quantum mechanics in unreached parameter spaces.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2022-12-01","The student, Hao Tong, accepted the attached license on 2020-11-20 at 15:45.","The student, Hao Tong, submitted this Thesis for approval on 2020-11-20 at 15:54.","This Thesis was approved for publication on 2020-11-22 at 17:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15925 on 2021-03-04 at 16:19:42","Made available in DSpace on 2021-03-05T21:40:46Z (GMT). No. of bitstreams: 2 TONG-THESIS-2020.pdf: 23367784 bytes, checksum: 715e13504af7f5ddd75a710233a9946c (MD5) LICENSE.txt: 4205 bytes, checksum: 259916117b4fc2f306ba7f27e9f23f2d (MD5) Previous issue date: 2020-11-22","Embargo set by: Seth Robbins for item 117205 Lift date: 2023-03-05T21:40:52Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 117205 Lift date: 2023-03-05T21:43:00Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/109501"],"dc:language":["en"],"dc:rights":["Copyright 2020 Hao Tong"],"dc:subject":["Bound state in the continuum","Phononic crystal"],"dc:title":["Observation of mechanical bound states in the continuum"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Electrical & Computer Engr"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:50Z"}