Toward superlensing with metal–dielectric composites and multilayers

Nielsen, Rasmus; Thoreson, Mark D.; Chen, Weiqiang; Hvam, Jørn Märcher; Shalaev, Vladimir M.; Boltasseva, Alexandra

doi:10.1007/s00340-010-4065-z

Cited by 38 publications

(39 citation statements)

References 33 publications

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“…It has been recently demonstrated, however, that by providing ultrathin wetting layers, continuous Ag metal films down to 5 nm can be deposited. 20 Such fabrication techniques may ultimately extend material homogenization to lower wavelengths.…”

Section: Discussionmentioning

confidence: 99%

Permittivity evaluation of multilayered hyperbolic metamaterials: Ellipsometry vs. reflectometry

Tumkur

Barnakov

Kee

et al. 2015

Journal of Applied Physics

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Metal-dielectric nanolaminates represent a class of hyperbolic metamaterials with uniaxial permittivity tensor. In this study, we critically compare permittivity extraction of nanolaminate samples using two techniques: polarized reflectometry vs. spectroscopic anisotropic ellipsometry. Both Au/MgF2 and Ag/MgF2 metal-dielectric stacks are examined. We demonstrate the applicability of the treatment of the multilayered material as a uniaxial medium and compare the derived optical parameters to those expected from the effective medium approximation. We also experimentally compare the effect of varying the material outer layer on the homogenization of the composite. Additionally, we introduce a simple empirical method of extracting the epsilon-near-zero point of the nanolaminates from normal incidence reflectance. The results of this study are useful in accurate determination of the hyperbolic material permittivity and in the ability to tune its optical properties.

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Section: Discussionmentioning

confidence: 99%

Permittivity evaluation of multilayered hyperbolic metamaterials: Ellipsometry vs. reflectometry

Tumkur

Barnakov

Kee

et al. 2015

Journal of Applied Physics

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“…A multilayered structure with sufficiently thin layers can be considered an anisotropic medium. According to effective-medium theory (EMT), the parallel and perpendicular permittivities are described as [7] …”

Section: Optimized Superlens Structurementioning

confidence: 99%

“…A parallel permittivity equal to unity (ε x = ε y = 1) and an infinite perpendicular permittivity (ε z →∞) yield the situation known as the canalization regime, where a multilayered structure can act as a superlens [7]. In the canalization regime, the operating wavelength can be tuned by altering the thickness ratio of metal to dielectric layers, whereas for the permittivitymatching condition (…”

Section: Optimized Superlens Structurementioning

confidence: 99%

“…To this end, the use of metal-dielectric composites and multilayered structures has been proposed. Although using both of these structures can tune the real part of the permittivity, and consequently the operational wavelength, fabrication results indicate that significant loss limits the actual application of superlenses made of composite structures [7].…”

Section: Introductionmentioning

confidence: 99%

“…Using these structures, subwavelength resolution can also be achieved at frequencies different from the plasmon resonances of the individual layers. In this case the imaging mechanism is different from the permittivity-matching condition, and the operational wavelength can be tuned by altering the relative thicknesses of the metal and dielectric layers [7].…”

Section: Introductionmentioning

confidence: 99%

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Two-Dimensional Sub-diffraction-limited Imaging by an Optimized Multilayer Superlens

Ahmadi

Forooraghi

Faraji‐Dana

et al. 2016

Journal of the Optical Society of Korea

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An optimized multilayer superlens is designed, using a rigorous and efficient approach based on the method of moments (MoM) in conjunction with a simulated annealing (SA) algorithm. For the MoM solution, fast evaluation of closed-form Green's functions (GFs) in the spatial domain is performed by applying the complex-image (CI) technique, which obviates the time-consuming numerical evaluation of Sommerfeld integrals. The imaging capability of the superlens is examined with the correlation coefficient; results show that using circular polarization for the incident wave can improve this coefficient. To validate the proposed method, finite-element-based simulations are exploited, which reveal the method's accuracy and computational efficiency. Simulation results indicate that the designed structure is capable of producing two-dimensional sub-diffraction-limited images in the visible range, which may make it more versatile for practical applications. Finally, as a considerable finding, it is demonstrated for the proposed design that using circularly polarized illumination provides improved super-resolving performance, compared to linearly polarized illumination.

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