Results 71 to 80 of about 15,942 (294)

A Topology Optimization Framework for the Inverse Design of Nonlinear Mechanical Metamaterials

Advanced Engineering Materials, EarlyView.
This work uses topology optimization to design unit cells for mechanical metamaterials with a prescribed nonlinear stress–strain response. The framework adds contact and postbuckling modeling to synthesize microstructures for three highly nonlinear responses, including pseudoductile behavior, monostable with snap‐through buckling, and bistable ...
Charlie Aveline, Matthew Santer, Robert Hewson   +2 more
wiley   +1 more source

Stimulated Brillouin scattering in metamaterials

, 2016
We compute the SBS gain for a metamaterial comprising a cubic lattice of dielectric spheres suspended in a background dielectric material. Theoretical methods are presented to calculate the optical, acoustic, and opto-acoustic parameters that describe ...
de Sterke, C. Martijn, Kuhlmey, B. T., Lapine, M., Poulton, C. G., Smith, M. J. A., Wolff, C.   +5 more
core   +1 more source

Circular‐Polarization‐Sensitive Organic Photodetectors with a Chiral Nanopatterned Electrode Inverse‐Designed by Genetic Algorithm

Advanced Functional Materials, EarlyView.
A chiral photodetector capable of selectively distinguishing left‐ and right‐handed circularly polarized light is experimentally demonstrated. The device, which features a nanopatterned electrode inverse‐designed by a genetic algorithm within a metal–dielectric–metal nanocavity that incorporates a vacuum‐deposited small‐molecule multilayer, exhibits ...
Kyung Ryoul Park, Jewoong Lee, In‐Suk Choi, Changsoon Kim   +3 more
wiley   +1 more source

Shape morphing Kirigami mechanical metamaterials [PDF]

Scientific Reports, 2016
AbstractMechanical metamaterials exhibit unusual properties through the shape and movement of their engineered subunits. This work presents a new investigation of the Poisson’s ratios of a family of cellular metamaterials based on Kirigami design principles. Kirigami is the art of cutting and folding paper to obtain 3D shapes.
Neville, Robin, Scarpa, Fabrizio, Pirrera, Alberto   +2 more
openaire   +4 more sources

A lattice-mechanical metamaterial with tunable two-step deformation, tunable stiffness, tunable energy absorption and programmable properties

Materials Research Express
Mechanical metamaterials have attracted much attention in recent years because of excellent properties. However, most mechanical metamaterials have only a relatively fixed and single deformation mode.
Chenyang Liu, Zexin Gao, Jiahui Chang, Jianan Zhao, Song Qiu, Peiran Yu, Xi Zhang   +6 more
doaj   +1 more source

Metamaterial with tunable positive to negative Poisson’s ratio inspired by the Saint Andrew’s Cross

Next Materials
This paper presents a novel mechanical metamaterial inspired by the geometric form of the Saint Andrew’s Cross (Saltire), designed to exhibit a tunable on-axes Poisson’s ratio ranging from positive to negative values.
Teik-Cheng Lim
doaj   +1 more source

Mid-infrared Suspended Waveguide Platform and Building Blocks [PDF]

, 2018
In this work we present our recent progress in the development of a platform for the mid-infrared wavelength range, based on suspended silicon waveguide with subwavelength metamaterial cladding. The platform has some intrinsic advantages, which make it a
Cao, W., Cheben, Pavel, Cheng, Y.X., El Mokhtari Mimun, Faysal, Halir, Robert, Khokhar, A.Z., Litteljohns, C.G., Mashanovich, G.Z., Molina-Fernandez, Iñigo, Nedeljkovic, Milos, Ortega-Moñux, Alejandro, Osman, A., Qu, Z, Soler-Penades, Jordi, Sánchez-Postigo, Alejandro, Wanguemert-Perez, Juan Gonzalo   +15 more
core   +2 more sources

Block Copolymers: Emerging Building Blocks for Additive Manufacturing

Advanced Functional Materials, EarlyView.
This review addresses how block copolymer (BCP) physics and rheology have led to the widespread use of BCPs in advanced additive manufacturing techniques, with particular emphasis on the untapped potential of these nanostructured materials toward achieving multi‐scale architected materials with unique, programmable material properties.
Alice S. Fergerson, Hemish B. Thakkar, Jiaen Wu, Emily C. Davidson   +3 more
wiley   +1 more source

Relaxed micromorphic model of transient wave propagation in anisotropic band-gap metastructures

, 2018
In this paper, we show that the transient waveforms arising from several localised pulses in a micro-structured material can be reproduced by a corresponding generalised continuum of the relaxed micromorphic type.
Aivaliotis, Alexios, Barbagallo, Gabriele, D'Agostino, Marco Valerio, Madeo, Angela, Neff, Patrizio, Tallarico, Domenico   +5 more
core   +3 more sources

Three‐Dimensional Hierarchical Nanowire‐Networks with Deep‐Focus Tolerance and Adhesion Robustness for Harsh‐Environment SERS Sensing

Advanced Functional Materials, EarlyView.
A 3D nanowire‐network SERS substrate with robust adhesion is developed, featuring pronounced z‐direction optical activity, ultralow detection limit (1.5 × 10−13 M), and excellent signal uniformity (RSD < 10%). Enabled by enhanced light scattering, increased optical density of states, and structural reinforcement, the substrate demonstrates stable, high‐
Jinglai Duan, Wentao Wang, Xiu Liang, Yongliang Zhang, Jie Liu, Yu Bai, Dangyuan Lei   +6 more
wiley   +1 more source