Avoiding imaging artifacts from resonant modes in metamaterial superlenses

Aghanejad, Iman; Chau, Kenneth J.; Markley, Loïc

doi:10.1103/physrevb.100.035137

Cited by 3 publications

References 29 publications

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Superlens coupling to object and image: A secondary resonance mechanism to improve single-negative imaging of electromagnetic waves

Splawinski

Bostock

Chau

et al. 2021

Journal of Applied Physics

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Superlens slabs rely on the coherent superposition of multiply reflected evanescent waves to amplify and restore the fine details of an object at the image plane. If a superlens slab is placed in close proximity to a source object and image detector, similar interactions with these external components can introduce resonances outside of the superlens. In this work, we explore the role of external resonances on single-negative slab superlens performance by considering a complete electromagnetic imaging system containing a physical source object and image detector, each modeled as a planar dielectric half-space. In studying the transmission of spectral components that carry real power through this system, we find that resonances outside the lens can have a dramatic impact on single-negative superlens performance. In particular, we find that the resonances external to a μ-negative lens can be used to extend the imaging range beyond the extreme near field and maintain super-resolution even in the presence of loss.

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Superlens coupling to object and image: A secondary resonance mechanism to improve single-negative imaging of electromagnetic waves

Splawinski

Bostock

Chau

et al. 2021

Journal of Applied Physics

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Coupled Surface Mode Resonances in Finite Transverse-Width Superlenses

Splawinski

Markley

2020

2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting

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Broadband subdiffraction imaging in highly anisotropic metamaterials using ultra-short super-Gaussian pulse

Shawkat¹,

Habib²,

Razzak³

2020

OSA Continuum

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Metamaterials with large axial anisotropy posses a nearly flat dispersion profile in k (wave vector) space and thus offer an effective solution to overcome the diffraction limit by supporting the propagating high - k extraordinary modes. However, existing analytical models reveal that resonant high - k slab modes and the polarization dependent ordinary waves cause image distortion in metamaterial slabs. In this paper, we consider a two-dimensional (2D), local, highly anisotropic metamaterial slab as an imaging device and apply a standard transfer matrix approach to calculate the transmission properties of the slab at terahertz (THz) frequencies. Our simple analytical model reveals that resonances induced by the reflections are the main source of deteriorating the image quality, thus requires effective post-processing methods to remove them. For that, we apply an ultra-short super-Gaussian windowing function to minimize the resonant behavior of the metamaterial slabs, observing good imaging over the frequency band of interest. Our numerical method offers a pathway to mitigate observed image artefacts, and are applicable to a range of highly anisotropic metamaterial slabs, e.g., wire metamaterials, layered metamaterials and magnifying hyperlenses. Finally, finite element based software is used to model the 2D metamaterial slab to verify the analytical models.

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Avoiding imaging artifacts from resonant modes in metamaterial superlenses

Cited by 3 publications

References 29 publications

Superlens coupling to object and image: A secondary resonance mechanism to improve single-negative imaging of electromagnetic waves

Superlens coupling to object and image: A secondary resonance mechanism to improve single-negative imaging of electromagnetic waves

Coupled Surface Mode Resonances in Finite Transverse-Width Superlenses

Broadband subdiffraction imaging in highly anisotropic metamaterials using ultra-short super-Gaussian pulse

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