Finite Difference Time-Domain Modelling of Metamaterials: GPU Implementation of Cylindrical Cloak

Dawood, Attique

doi:10.7716/aem.v2i2.171

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…The model in [13] provides the waveforms of transmitted field, transmitted field beyond the cylindrical slab, that is, the cloaked object, transmission coefficient, reflection coefficient (calculated by subtracting transmission coefficient from unity), and the real and imaginary components of the refractive index. The transmitted fields are determined by averaging the waveforms at various time steps.…”

Section: Resultsmentioning

confidence: 99%

“…The FDTD model in [13,14] uses the TM mode for cloaking. The cloaking parameters are therefore described by…”

Section: Finite Difference Time-domainmentioning

confidence: 99%

“…The equation is formed by implying the relevant relationships and test conditions suggested in [10,12] and modifying it to match the default frequency and cell size values used in [13,14]. Thus at optical frequencies, the cell size is reduced and the time steps increased accordingly to hold the stability constant at the preconsidered value.…”

Section: Finite Difference Time-domainmentioning

confidence: 99%

See 2 more Smart Citations

Impact of Radii Ratios on a Two-Dimensional Cloaking Structure and Corresponding Analysis for Practical Design at Optical Wavelengths

Anam

Zahir

2017

International Journal of Optics

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This work is an extension to the evaluation and analysis of a two-dimensional cylindrical cloak in the Terahertz or visible range spectrum using Finite Difference Time-Domain (FDTD) method. It was concluded that it is possible to expand the frequency range of a cylindrical cloaking model by careful scaling of the inner and outer radius of the simulation geometry with respect to cell size and/or number of time steps in the simulation grid while maintaining appropriate stability conditions. Analysis in this study is based on a change in the radii ratio, that is, outer radius to inner radius, of the cloaking structure for an array of wavelengths in the visible spectrum. Corresponding outputs show inconsistency in the cloaking pattern with respect to frequency. The inconsistency is further increased as the radii ratio is decreased. The results also help to establish a linear relationship between the transmission coefficient and the real component of refractive index with respect to different radii ratios which may simplify the selection of the material for practical design purposes. Additional performance analysis is carried out such that the dimensions of the cloak are held constant at an average value and the frequency varied to determine how a cloaked object may be perceived by the human eye which considers different wavelengths to be superimposed on each other simultaneously.

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Section: Resultsmentioning

confidence: 99%

“…The FDTD model in [13,14] uses the TM mode for cloaking. The cloaking parameters are therefore described by…”

Section: Finite Difference Time-domainmentioning

confidence: 99%

Section: Finite Difference Time-domainmentioning

confidence: 99%

See 1 more Smart Citation

Impact of Radii Ratios on a Two-Dimensional Cloaking Structure and Corresponding Analysis for Practical Design at Optical Wavelengths

Anam

Zahir

2017

International Journal of Optics

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A highly efficient low-profile tetra-band metasurface absorber for X, Ku, and K band applications

Murtaza

Wakeel

Anjum

2022

AEU - International Journal of Electronics and Communications

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3D rainbow phononic crystals for extended vibration attenuation bands

Meng

Bailey

Chen

et al. 2020

Sci Rep

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We hereby report for the first time on the design, manufacturing and testing of a three-dimensional (3D) nearly-periodic, locally resonant phononic crystal (PnC). Most of the research effort on PnCs and metamaterials has been focused on the enhanced dynamic properties arising from their periodic design. Lately, additive manufacturing techniques have made a number of designs with intrinsically complex geometries feasible to produce. These recent developments have led to innovative solutions for broadband vibration attenuation, with a multitude of potential engineering applications. The recently introduced concept of rainbow metamaterials and PnCs has shown a significant potential for further expanding the spectrum of vibration attenuation in such structures by introducing a gradient profile for the considered unit cells. Given the above, it is expected that designing non-periodic PnCs will attract significant attention from scientists and engineers in the years to come. The proposed nearly-periodic design is based on cuboid blocks connected by curved beams, with internal voids in the blocks being implemented to adjust the local masses and generate a 3D rainbow PnC. Results show that the proposed approach can produce lightweight PnCs of a simple, manufacturable design exhibiting attenuation bandwidths more than two times larger than the equivalent periodic designs of equal mass.

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Finite Difference Time-Domain Modelling of Metamaterials: GPU Implementation of Cylindrical Cloak

Cited by 5 publications

References 4 publications

Impact of Radii Ratios on a Two-Dimensional Cloaking Structure and Corresponding Analysis for Practical Design at Optical Wavelengths

Impact of Radii Ratios on a Two-Dimensional Cloaking Structure and Corresponding Analysis for Practical Design at Optical Wavelengths

A highly efficient low-profile tetra-band metasurface absorber for X, Ku, and K band applications

3D rainbow phononic crystals for extended vibration attenuation bands

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