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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 67 for “"Phononic"”.
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Phononic Frequency Combs
… A direct analogue of frequency combs in the phononic or acoustic domain has not been reported to date. This thesis describes a series of results to provide the first clear evidence for the generation of phononic frequency combs in the domain of micromechanical resonators. These results are …
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Hypersonic phononic crystals
… properties. This thesis explores hypersonic phononic crystals as means to achieve control over high frequency acoustic phonons. An integrated approach to fabrication, measurement and analysis of hypersonic phononic crystals with band gaps in the GHz range is presented. First, the phonon …
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Gallium Nitride phononic crystal resonator
… Nitride (GaN) Lamb Wave resonator using a Phononic Crystal (PnC) to selectively confine elastic vibrations with wide-band spurious mode suppression. A unique feature of the design demonstrated here is a folded PnC structure to relax energy confinement in the non-resonant dimension and to …
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Acousto-Electric Impedance Of Ferroelectric Phononic Superlattice
… Acousto-Electric Impedance z of a Ferroelectric Phononic Superlattice (fps) is investigated. The analytical derivation of z and its phase reveal that both are functions of physical parameters such as the electromechanical coupling coefficient, the mechanical quality factor, the domain length and …
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Mechanical bound states in the continuum in phononic crystals
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01
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Phononic materials as ultrasonic filters in nondestructive evaluation measurements
… laboratory measurements. The periodic nature of phononic materials can be engineered to induce frequency regions of reduced transmission, called band gaps. This work presents a method to use phononic materials as ultrasonic filters in nonlinear ultrasound measurements, to passively filter …
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Nonlinear wave dynamics of continuum phononic materials with periodic rough contacts
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Phononic metamaterials based on complex geometries : "a new kind of metamaterial"
… constant is found to be a good indicator of phononic behavior of the system, besides other parameters studied. Our findings does not only expand the repertoire for novel materials by introducing the ubiquitous yet unconventional geometry to metamaterials; but also have interdisciplinary …
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Ultra-sensitive Mid-infrared Detection Using Phononic Crystal Resonator-based Oscillator
… detectors based on surface acoustic wave (SAW) phononic crystal (PnC) oscillators. By configuring a PnC resonator featuring high-frequency-quality-factor product into a low-noise self-oscillation system, my MIR detector achieves high sensitivity on the order of hundreds of picowatts. The SAW …
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Investigating the Existence of Coherent Phonon Scattering in Silicon Using Phononic Crystals
… of phonons scattered from the inclusions in the phononic crystal. The intent of this work is to investigate the existence of coherent scattering in Si via phononic crystals. A phononic crystal is a periodic array of inclusions inside a host material. The inclusions could be a second material or a …
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Atomistic disorder effects on structural, electronic and phononic properties in Si1-xGex
… properties including structural, electronic and phononic properties. It is found that the arrangement and rearrangement of atoms plays an important role on governing its fundamental material properties and mechanisms. For example, first principles simulations show that atomic scale variations in …
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Band topology beyond symmetry eigenvalues with applications to electronic and phononic systems
… properties are hidden in the electronic and phononic band structures, and how robust these properties are. We describe various new kinds of band topology, which emerge when comparing different ways of classifying topology. The dissertation begins by introducing some common topological …
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Design optimization of acoustic metamaterials and phononic crystals with a time domain method
… optimizations of acoustic metamaterials and phononic crystals is presented. The gradient-based design procedure is suitable for large numbers of design variables, and results are shown on achieving effective material properties with a unit cell and the broadband noise reduction with periodic …
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Time-resolved and spectroscopic studies on phononic switching of magnetisation in iron garnets
Contains fulltext : 311640.pdf (Publisher’s version ) (Open Access)
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Experimentally informed modeling of nonlinear wave propagation and phononic behavior in prescribed delaminations
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Wave Motion in 1-D Viscoelastic Phononic Crystals: A Comprehensive Analytical, Numerical and Experimental Study
Phononic crystals are engineered materials which exhibit unique wave motion properties due to periodic arrangement of multiple homogeneous constituents. Over the last decade, metallic phononic crystals have been thoroughly investigated. However, viscoelastic phononic crystals composed of polymers …
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Generalized phononic networks : of length scales, symmetry breaking and (non) locality : "controlling complexity through simplicity"
… from sound insulation to heat management. Phononic crystals and metamaterials are artificially structured materials (at certain length scales) that provide promise in controlling the propagation of phonons in solids. However, the vector nature of the phonon makes the development of a …
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2D and 3D periodic templates through holographic interference lithography : photonic and phononic crystals and biomimetic microlens arrays
… such diverse areas as photonic crystals, phononic crystals, drug delivery, microtrusses, tissue scaffolds, microfluidics and colloidal crystallization. A correlation between structure and photonic band gap properties was established by systematically exploring the 11 FCC space groups. This …
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