Broadband subwavelength imaging using non-resonant metamaterials

Zheng, Bin; Zhang, Runren; Zhou, Min; Zhang, Wei-Bin; Lin, Shisheng; Ni, Zhenhua; Wang, Huaping; Yu, F. Richard; Chen, Hongsheng

doi:10.1063/1.4865897

Cited by 14 publications

(11 citation statements)

References 21 publications

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“…where ɛ ρ is the permittivity component in the radial direction, which in our case corresponds to the direction along the layers, and ɛ θ is the azimuthal component of the dielectric permittivity. Therefore, the equi-frequency contour of such a structure in the ρ - θ plane can be described by refs 18 , 30 , 31 …”

Section: Resultsmentioning

confidence: 99%

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Experimental demonstration of a non-resonant hyperlens in the visible spectral range

2015

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A metamaterial hyperlens offers a solution to overcome the diffraction limit by transforming evanescent waves responsible for imaging subwavelength features of an object into propagating waves. However, the first realizations of optical hyperlenses were limited by significant resonance-induced losses. Here we report the experimental demonstration of a non-resonant waveguide-coupled hyperlens operating in the visible wavelength range. A detailed investigation of various materials systems proves that a radial fan-shaped configuration is superior to the concentric layer-based configuration in that it relies on non-resonant negative dielectric response, and, as a result, enables low-loss performance in the visible range.

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Section: Resultsmentioning

confidence: 99%

“…As discussed in detail below, this alternative approach has strong potential to enable a low-loss hyperlenses. However, until now, it had only been designed and demonstrated in the microwave frequency range and in acoustics 29 30 31 , while the challenge of fabricating such structures in the optical frequency range has still not been overcome.…”

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confidence: 99%

Experimental demonstration of a non-resonant hyperlens in the visible spectral range

2015

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“…superlenses, [1][2][3][4][5][6]13,14 hyperlenses, 7-10 integrated metalenses, 11,15 and non-resonant elliptical lenses, 12 which can either amplify or propagate evanescent waves carrying the precious high spatial frequency information of an object. However, these efforts have stopped short of creating a truly perfect lens, since their resolution is limited by losses and they cannot focus light of arbitrary polarization especially at optical wavelengths.…”

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confidence: 99%

Plasmonic Superlens Imaging Enhanced by Incoherent Active Convolved Illumination

2018

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We introduce a loss compensation method to increase the resolution of near-field imaging with a plasmonic superlens that relies on the convolution of a high spatial frequency passband function with the object. Implementation with incoherent light removes the need for phase information. The method is described theoretically and numerical imaging results with artificial noise are presented, which display enhanced resolution of a few tens of nanometers, or around one-fifteenth of the free space wavelength. A physical implementation of the method is designed and simulated to provide a proof-of-principle, and steps toward experimental implementation are discussed.The theory and experimental demonstration of metamaterials has inspired interesting avenues of imaging, 1-12 lithography, 13,14 and beam generation 15 beyond the diffraction limit, particularly motivated by the prospect of a perfect lens. 16 Researchers have quickly realized arXiv:1801.06583v1 [physics.optics]

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“…Therefore, although hyperbolic media have been proposed for many applications including super-resolution imaging and density of state enhancement 17 19 , the extreme and ellipsoidal anisotropy of the proposed structure can provide unique opportunities. In addition, previously reported ellipsoidal anisotropic artificial media 21 22 23 24 have maximum index <15, and their maximum index is fundamentally limited by nano-gap field enhancement, as in refs 8 , 9 .…”

Section: Discussionmentioning

confidence: 80%

Broadband giant-refractive-index material based on mesoscopic space-filling curves

et al. 2016

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The refractive index is the fundamental property of all optical materials and dictates Snell's law, propagation speed, wavelength, diffraction, energy density, absorption and emission of light in materials. Experimentally realized broadband refractive indices remain <40, even with intricately designed artificial media. Herein, we demonstrate a measured index >1,800 resulting from a mesoscopic crystal with a dielectric constant greater than three million. This gigantic enhancement effect originates from the space-filling curve concept from mathematics. The principle is inherently very broad band, the enhancement being nearly constant from zero up to the frequency of interest. This broadband giant-refractive-index medium promises not only enhanced resolution in imaging and raised fundamental absorption limits in solar energy devices, but also compact, power-efficient components for optical communication and increased performance in many other applications.

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Broadband subwavelength imaging using non-resonant metamaterials

Cited by 14 publications

References 21 publications

Experimental demonstration of a non-resonant hyperlens in the visible spectral range

Experimental demonstration of a non-resonant hyperlens in the visible spectral range

Plasmonic Superlens Imaging Enhanced by Incoherent Active Convolved Illumination

Broadband giant-refractive-index material based on mesoscopic space-filling curves

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