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oai:www.ideals.illinois.edu:2142/109501 2023-07-11 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Fang, Kejie Tong, Hao 2021-03-05T21:40:46Z 2021-03-05T21:40:46Z 2023-03-05T21:43:00Z 2020-11-22 2020-12 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 application/pdf http://hdl.handle.net/2142/109501 en Copyright 2020 Hao Tong Bound state in the continuum Phononic crystal Observation of mechanical bound states in the continuum text Thesis Electrical & Computer Eng Electrical & Computer Engr University of Illinois at Urbana-Champaign Thesis M.S.