Hyperuniform disordered phononic structures

Gkantzounis, Georgios; Amoah, Timothy; Florescu, Marian

doi:10.1103/physrevb.95.094120

Cited by 68 publications

(56 citation statements)

References 53 publications

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“…On the other hand, disorder in elastic media [11][12][13][14] is important for a large range of applications including acoustic filters [15], piezoelectric materials [16], biological materials [17], fracture [18], and manipulation of the thermal conductance [7,19], etc. Despite this and in contrast to the vast body of studies dealing with the effects of disorder on photonic structures, the research of disordered phononic systems and the effect of disorder on phononic band gaps has been sparse, with a few notable exceptions [12,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…We employ here the bottom-up approach discussed previously [21,[27][28][29][30], which leads to a nearly-hyperuniform distribution of points. Specifically, we consider an arbitrarily-shaped waveguide path formed by equidistant scattering centres and surrounded by a bulk hyperuniform-like material.…”

Section: D Modes In Nearly-hyperuniform Structuresmentioning

confidence: 99%

“…Hence, we do not expect an absolute band gap, since there is no spectral overlap between the out-of-plane and in-plane band gaps found in the 2D structures. However, these structures exhibit spectral regions of very low transmission [21], which we plan to exploit to create practical 3D slab waveguides with a height equal to the average separation distance of the cylinders, i.e., 1 µm. We note that for much larger heights the finite size effects should be minimal and therefore one should retrieve the same results as in the 2D case.…”

Section: Waveguide Modes In 3d Slabsmentioning

confidence: 99%

“…In general, hyperuniform disordered structures [23], which exhibit short-and long-range uniformity, have been investigated in the last decade as an intermediate regime between ordered and totally (uncorrelated) disordered structures [20,21,24] and have received increasing attention in the context of controlling the flow of electromagnetic radiation at the micron scale. The recently introduced hyperuniform disordered phononic structures (HDPS) [21], have the advantage of combining the properties of both periodic and random counterpart extremes.…”

Section: Introductionmentioning

confidence: 99%

“…The recently introduced hyperuniform disordered phononic structures (HDPS) [21], have the advantage of combining the properties of both periodic and random counterpart extremes. This combination makes them ideal for phonon manipulation since they can exhibit large band gaps, statistical isotropy, localization, and diffusive propagation at the same time.…”

Section: Introductionmentioning

confidence: 99%

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Freeform Phononic Waveguides

Gkantzounis

Florescu

2017

Crystals

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Abstract:We employ a recently introduced class of artificial structurally-disordered phononic structures that exhibit large and robust elastic frequency band gaps for efficient phonon guiding. Phononic crystals are periodic structures that prohibit the propagation of elastic waves through destructive interference and exhibit large band gaps and ballistic propagation of elastic waves in the permitted frequency ranges. In contrast, random-structured materials do not exhibit band gaps and favour localization or diffusive propagation. Here, we use structures with correlated disorder constructed from the so-called stealthy hyperuniform disordered point patterns, which can smoothly vary from completely random to periodic (full order) by adjusting a single parameter. Such amorphous-like structures exhibit large band gaps (comparable to the periodic ones), both ballistic-like and diffusive propagation of elastic waves, and a large number of localized modes near the band edges. The presence of large elastic band gaps allows the creation of waveguides in hyperuniform materials, and we analyse various waveguide architectures displaying nearly 100% transmission in the GHz regime. Such phononic-circuit architectures are expected to have a direct impact on integrated micro-electro-mechanical filters and modulators for wireless communications and acousto-optical sensing applications.

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Section: Introductionmentioning

confidence: 99%

Section: D Modes In Nearly-hyperuniform Structuresmentioning

confidence: 99%

Section: Waveguide Modes In 3d Slabsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Freeform Phononic Waveguides

Gkantzounis

Florescu

2017

Crystals

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Directed Assembly of Hybrid Nanomaterials and Nanocomposites

et al. 2018

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Hybrid nanomaterials are molecular or colloidal-level combinations of organic and inorganic materials, or otherwise strongly dissimilar materials. They are often, though not exclusively, anisotropic in shape. A canonical example is an inorganic nanorod or nanosheet sheathed in, or decorated by, a polymeric or other organic material, where both the inorganic and organic components are important for the properties of the system. Hybrid nanomaterials and nanocomposites have generated strong interest for a broad range of applications due to their functional properties. Generating macroscopic assemblies of hybrid nanomaterials and nanomaterials in nanocomposites with controlled orientation and placement by directed assembly is important for realizing such applications. Here, a survey of critical issues and themes in directed assembly of hybrid nanomaterials and nanocomposites is provided, highlighting recent efforts in this field with particular emphasis on scalable methods.

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Elasticity Mapping of Colloidal Glasses Reveals the Interplay between Mesoscopic Order and Granular Mechanics

Vasileiadis,

Schöttle,

Theis

et al. 2024

Small Methods

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Colloidal glasses (CGs) made of polymer (polymethylmethacrylate) nanoparticles are promising metamaterials for light and sound manipulation, but fabrication imperfections and fragility can limit their functionality and applications. Here, the vibrational mechanical modes of nanoparticles are probed to evaluate the nanomechanical and morphological properties of various CGs architectures. Utilizing the scanning micro‐Brillouin light scattering (µ‐BLS), the effective elastic constants and nanoparticles' sizes is determined as a function of position in a remote and non‐destructive manner. This method is applied to CG mesostructures with different spatial distributions of their particle size and degree of order. These include CGs with single‐sized systems, binary mixtures, bilayer structures, continuous gradient structures, and gradient mixtures. The microenvironments govern the local mechanical properties and highlight how the granular mesostructure can be used to develop durable functional polymer colloids. A size effect is revealed on the effective elastic constant, with the smallest particles and ordered assemblies forming robust structures, and classify the various types of mesoscale order in terms of their mechanical stiffness. The work establishes scanning µ‐BLS as a tool for mapping elasticity, particle size, and local structure in complex nanostructures.

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Hyperuniform disordered phononic structures

Cited by 68 publications

References 53 publications

Freeform Phononic Waveguides

Freeform Phononic Waveguides

Directed Assembly of Hybrid Nanomaterials and Nanocomposites

Elasticity Mapping of Colloidal Glasses Reveals the Interplay between Mesoscopic Order and Granular Mechanics

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