Mechanical metamaterials

In this work, we proposed a mechanically-tunable metamaterial perfect absorber by exploiting a pasted nano silver ink on flexible polyimide substrate. At flat configuration, the proposed structure is acted as a single band metamaterial absorber in which a resonance peak induced at 3.7 GHz with an absorptivity of 99.9%.

10p viplato 02-01-2024 8 3   Download

As an important subset of metamaterials with unprecedented combinations of favorable mechanical, mass transport and biological properties, meta-biomaterials have attracted much research interest recently because of their great potential in biomedical applications, especially in orthopedic tissue repair and replacement.

22p viberbers 09-08-2023 6 3   Download

We numerically demonstrated a dual-band metamaterial absorber (MPA) operating in low frequency range based on a flexible polyimide substrate. For the flat configuration, two absorption peaks are obtained at 450 MHz and 1.47 GHz with absorption over 90%.

8p visirius 19-01-2023 8 4   Download

This work presents a novel multiscale semi-analytical technique for the acoustic plane wave analysis of (negative) dynamic mass density type local resonance metamaterials with complex micro-structural geometry. A two step solution strategy is adopted, in which the unit cell problem at the micro-scale is solved once numerically, whereas the macro-scale problem is solved using an analytical plane wave expansion.

11p guernsey 28-12-2021 14 0   Download

Origami-inspired structures and mechanical metamaterials are often made up of individual tessellating repeat units, the folding and relative geometry of which determine the overall mechanical properties. If these units are identical, then the mechanical behaviour of the structure is uniform throughout, meaning that it is not able to adapt to changeable loading conditions.

9p guernsey 28-12-2021 6 0   Download

Spectral entropy is a basic measure of information available in the material interior about surface loads, or a measure of disorder introduced into elastic medium by the deformation. An exact analytical entropy function is derived for an isotropic plane solid under Gauss-distributed and point loads.

8p guernsey 28-12-2021 7 0   Download

Consequently, a polarizationconversion mode is obtained with a high cross-polarization reflection in a broadband region (where the cross-polarization coefficient reaches up to 75 % in the frequency-range of 12.5 - 16.5 GHz). The polarization conversion was verified by experiment and the mechanism was clarified by the simulation of induced electric and magnetic fields. Our work could contribute to metamaterial-based multifunctional devices such as filter and polarization modulators.

9p spiritedaway36 25-11-2021 10 1   Download

Superlens imaging has been known as one of the most intriguing applications of metamaterials due to its capability of sub-wavelength imaging. In this report, we numerically demonstrate the possibility to make an amplifying superlens, which can focus and consequently enhance electromagnetic signals emitted at GHz frequencies. Simulations using the finite integration technique are performed to explore the amplifying mechanism of the proposed superlens.

8p abcxyz123_02 03-03-2020 11 1   Download

In this work, we investigate the influences of the dielectric layer on the magnetic resonance of the cut-wire pair structure (CWP). The interaction between the cut-wires is modeled through a LC circuit, based on which, the magnetic resonant frequency is calculated. Furthermore, the dependence of the resonant bandwidth on the structure parameters is also determined. By tuning the dielectric layer thickness, we obtained a noticeable broadening of the negative permeability regime of 17%, which represents the enhancement of the magnetic resonance.

4p caygaocaolon1 13-11-2019 28 0   Download

In this report, we experimentally and numerically demonstrated a simple metamaterial structure, which perfectly absorbs the microwave radiation. Samples are prepared using the photo-lithography technique and measured by the standard microwave vector network analyzer. Simulations using the finite integration technique are performed to explore the possible mechanism of the observation. It is found that the absorbed energy not only dissipates via material losses, as it was believed, but also reradiates as secondary sources.

7p thithizone 16-07-2019 20 0   Download

Purposes of the thesis: Propose physical mechanism to investigate metamaterial absorber operating in THz region. Design, simulation, and characterizations of MA in THz region. Optimize parameter structure to increase absorption and broaden operating wavelength region, modify operating wavelength by external factors.

27p xacxuoc4321 09-07-2019 30 4   Download