Sub-wavelength imaging by a slab of wire medium

Belov, Pavel A.; Hao, Yang; Sudhakaran, Sunil

doi:10.1109/aps.2006.1711640

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…Wire medium is a classic type of metamaterial [9][10][11][12][13][14]. As shown in [15], a standard wire medium aligned in the z-axis with square lattice has anisotropic permittivity as…”

Section: Introductionmentioning

confidence: 99%

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A Passive Adaptive Metamaterial Radome based on PIN Diodes

Ge,

Li,

Song

et al. 2024

ACES Journal

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Automatic protection of EM detecting systems from unexpected high-power incidence is important to the robustness and life of a passive detecting system. In this paper, an adaptive metamaterial radome which automatically shields the receiving antenna from strong incident wave is designed. Based on standard wire medium, PIN diodes are added between adjacent wires. When the incident EM wave is weak, the diodes are in “off” state and affect little to the transmission of the wire medium. When the incident EM wave is strong enough to turn the diodes to “on” state, electric currents will be automatically formed in the diodes and the power transmitted to the antenna will be largely reduced. The adaptive transmission of the proposed radome is validated by the simulation and measurement results.

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“…Wire medium is a classic type of metamaterial [9][10][11][12][13][14]. As shown in [15], a standard wire medium aligned in the z-axis with square lattice has anisotropic permittivity as…”

Section: Introductionmentioning

confidence: 99%

“…In this medium, transmission line mode can be supported. When the length of the wire is properly designed, the wire medium reaches Fabry-Perot resonance and can provide high transmission for all angle incidence with subwavelength details in this canalization status [9,10].…”

Section: Introductionmentioning

confidence: 99%

A Passive Adaptive Metamaterial Radome based on PIN Diodes

Ge,

Li,

Song

et al. 2024

ACES Journal

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show abstract

“…In order to validate the proposed spatially dispersive FDTD formulations, we have chosen flat sub-wavelength lenses formed by wire media [29], [34]. Such lenses provide unique opportunity to transfer images with resolution below classical diffraction limit.…”

Section: Modelling Of the Sub-wavelength Imagingmentioning

confidence: 99%

Modelling of Wave Propagation in Wire Media Using Spatially Dispersive Finite-Difference Time-Domain Method: Numerical Aspects

Zhao

Belov

Hao

2007

IEEE Trans. Antennas Propagat.

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Abstract-The finite-difference time-domain (FDTD) method is applied for modelling of wire media as artificial dielectrics. Both frequency dispersion and spatial dispersion effects in wire media are taken into account using the auxiliary differential equation (ADE) method. According to the authors' knowledge, this is the first time when the spatial dispersion effect is considered in the FDTD modelling. The stability of developed spatially dispersive FDTD formulations is analysed through the use of von Neumann method combined with the Routh-Hurwitz criterion. The results show that the conventional stability Courant limit is preserved using standard discretisation scheme for wire media modelling. Flat sub-wavelength lenses formed by wire media are chosen for validation of proposed spatially dispersive FDTD formulation. Results of the simulations demonstrate excellent subwavelength imaging capability of the wire medium slabs. The size of the simulation domain is significantly reduced using the modified perfectly matched layer (MPML) which can be placed in close vicinity of the wire medium. It is demonstrated that the reflections from the MPML-wire medium interface are less than -70 dB, that lead to dramatic improvement of convergence compared to conventional simulations.

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Broadband transfer of binary images via optically long wire media

et al. 2023

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In the paper the binary mechanism of the long-distance image transfer in a wire-medium (WM) endoscope is suggested and studied. We have shown that a discrete image formed by a set of point sources TM-polarized with respect to the WM can be transferred from the input to the output of the endoscope in a very broad frequency band. The underlying physics is the formation of local channels by a group of four adjacent wires. It allows the transfer of the near field beyond the Fabry–Perot resonances at which the known canalization mechanism offers the image. Both numerical simulations and experimental measurements confirm the deeply subwavelength resolution on the output WM interface. The binary imaging was studied until the frequencies at which the endoscope length exceeds 5λ. The transfer is possible in the entire investigated frequency range (from 1 up to 4 GHz) except for the frequencies where the Fabry–Perot resonance are not enough suppressed.

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Sub-wavelength imaging by a slab of wire medium

Cited by 3 publications

References 4 publications

A Passive Adaptive Metamaterial Radome based on PIN Diodes

A Passive Adaptive Metamaterial Radome based on PIN Diodes

Modelling of Wave Propagation in Wire Media Using Spatially Dispersive Finite-Difference Time-Domain Method: Numerical Aspects

Broadband transfer of binary images via optically long wire media

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