998 citations · 2.2k across the 24 of their papers we have counts for
24 papers
Topological mode conservation and conversion in phononic crystals with temporal interfaces
Mahmoud M. Samak, Osama R. Bilal
A sudden change in material properties creates a temporal interface and forces a propagating wave to change its frequency while preserving its wavenumber. In contrast to monoatomic…
Hierarchical metamaterials with tunable flat bands, zero-frequency, and wavenumber gaps
Mohamed A. Elgamal, Osama R. Bilal
Metamaterials are arrangement of basic building blocks that repeat in space, time, or both. These material systems serve as an excellent platform for controlling waves, such as eng…
Ultra-lightweight multi-functional gyroid-based metamaterial for simultaneous sound insulation, vibration suppression, and impact mitigation in all directions
Evan Kluge, Osama R. Bilal
Multi-functional materials are increasingly essential in many applications due to their ability to serve multiple purposes, simultaneously. Metamaterials can offer tailored functio…
Harnessing curvature for helical wave generation in spiral-based metamaterial structures
Mohamed Roshdy, Osama R. Bilal
Linearly polarized elastic waves propagating in a linear path have been extensively explored in numerous applications from biomedical imaging to structural health monitoring. Howev…
Observation of dispersion anomalies by design
Mahmoud M. Samak, Osama R. Bilal
Band structures encode electronic, optical, and acoustic properties of matter and can serve as an essential tool in material discovery and design. Dispersion anomalies -- sharp, no…
Experimental observation of flow instability control by metamaterial subsurfaces
Melanie Keogh, Jensen McTighe, Jason Dahl +1
Flow instabilities within a fluid flow can cause laminar-to-turbulent transition over surfaces. These instabilities can result from upstream, wake-generating disturbances, leading…
Re-programmable self-assembly of magnetic lattices
Audrey A. Watkins, Osama R. Bilal
Simple local interactions can cause primitive building blocks to self-assemble into complex and functional patterns. However, even for a small number of blocks, there exist a vast…
Static and dynamic analysis of auxetic three-dimensional curved metamaterials in both axial and circumferential directions
Mohamed Roshdy, Osama R. Bilal
Metamaterials can enable unique mechanical properties based on their geometry rather than their chemical composition. Such properties can go beyond what is possible using conventio…
Harnessing asymmetry to reprogram nonlinear metamaterials on-the-fly with no moving parts
Majid Kheybari, Osama R. Bilal
Various two-dimensional fabrication methods, such as deposition, etching, milling, laser cutting, and water jetting, suffer from asymmetry between the top and the bottom surface of…
Harnessing re-programmable phase transitions to control the propagation of sound waves
Audrey A. Watkins, Austin Eichelberg, Osama R. Bilal
Metamaterials can enable peculiar static and dynamic behavior (such as negative effective mass density, dynamical stiffness, and Poisson's ratio) due to their geometry rather than…
Exploiting Localized Transition Waves to Tune Sound Propagation in Soft Materials
Audrey A. Watkins, Austin Eichelberg, Osama R. Bilal
Programmable materials hold great potential for many applications such as deployable structures, soft robotics, and wave control, however, the presence of instability and disorder…
Experimental realization of phonon demultiplexing in three-dimensions
Osama R. Bilal, Chern Hwee Yee, Jan Rys +2
Phononic metamaterials enabled the realization of many acoustic components analogous to their electronic counterparts, such as transistors, logic gates and calculators. A key compo…
Demultiplexing infrasound phonons with tunable magnetic lattices
Audrey A. Watkins, Osama R. Bilal
Controlling infrasound signals is crucial to many processes ranging from predicting atmospheric events and seismic activities to sensing nuclear detonations. These waves can be man…
A flexible spiraling-metasurface as a versatile haptic interface
Osama R. Bilal, Vincenzo Costanza, Ali Israr +4
Haptic feedback is the most significant sensory interface following visual cues. Developing thin, flexible surfaces that function as haptic interfaces is important for augmenting v…
Enhancement of deep-subwavelength band gaps in flat spiral-based phononic metasurfaces using the trampoline phenomena
Osama R. Bilal, André Foehr, Chiara Daraio
Elastic and acoustic metamaterials can sculpt dispersion of waves through resonances. In turn, resonances can give rise to negative effective properties, usually localized around t…
Autonomous Deployment of a Solar Panel Using an Elastic Origami and Distributed Shape Memory Polymer Actuators
Tian Chen, Osama R. Bilal, Robert Lang +2
Deployable mechanical systems such as space solar panels rely on the intricate stowage of passive modules, and sophisticated deployment using a network of motorized actuators. As a…
Architected lattices for simultaneous broadband attenuation of airborne sound and mechanical vibrations in all directions
Osama R. Bilal, David Ballagi, Chiara Daraio
Phononic crystals and acoustic metamaterials are architected lattices designed to control the propagation of acoustic or elastic waves. In these materials, the dispersion propertie…
Spiral-based phononic plates: From wave beaming to topological insulators
André Foehr, Osama R. Bilal, Sebastian D. Huber +1
Phononic crystals and metamaterials take advantage of pre-designed geometrical structures to sculpt elastic waves, controlling their dispersion using different mechanisms. These me…
Harnessing bistability for directional propulsion of untethered, soft robots
Tian Chen, Osama R. Bilal, Kristina Shea +1
In most macro-scale robotics systems , propulsion and controls are enabled through a physical tether or complex on-board electronics and batteries. A tether simplifies the design p…
Observation of a phononic quadrupole topological insulator
Marc Serra-Garcia, Valerio Peri, Roman Süsstrunk +4
The modern theory of charge polarization in solids is based on a generalization of Berry's phase. Its possible quantization lies at the heart of our understanding of all systems wi…
Intrinsically polar elastic metamaterials
Osama R. Bilal, Roman Süsstrunk, Chiara Daraio +1
The ability to design and fabricate materials with tailored mechanical properties, combined with immunity to damage, is a frontier of materials engineering. For example, materials…
Inertial amplification of continuous structures: Large band gaps from small masses
Niels M. M. Frandsen, Osama R. Bilal, Jakob S. Jensen +1
Wave motion in a continuous elastic rod with a periodically attached inertial-amplification mechanism is investigated. The mechanism has properties similar to an "inerter" typicall…
Trampoline metamaterial: Local resonance enhancement by springboards
Osama R. Bilal, Mahmoud I. Hussein
We investigate the dispersion characteristics of locally resonant elastic metamaterials formed by the erection of pillars on the solid regions in a plate patterned by a periodic ar…
Ultrawide phononic band gap for combined in-plane and out-of-plane waves
Osama R. Bilal, Mahmoud I. Hussein
We consider two-dimensional phononic crystals formed from silicon and voids, and present optimized unit cell designs for (1) out-of-plane, (2) in-plane and (3) combined out-of-plan…