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Super-resolution imaging using a three-dimensional metamaterials nanolens
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Image of FIG. 1.
FIG. 1.

(a) Imaging with subwavelength resolution by the metamaterial nanolens at 1550 nm. The nanolens consists of high aspect ratio metallic nanowires which are embedded in a host dielectric medium. This bulk metamaterial transports subwavelength details of an object at a significant distance of more than six times the wavelength . (b) Scanning electron microscope (SEM) image of the “NEU” letters (acronym for Northeastern University) milled in 100 nm thick gold metallic film. The letters have 600 nm wide arms . (c) Near-field scanning optical microscope (NSOM) scan of the source object in the near-field at 1550 nm wavelength. (d) NSOM scan of the corresponding image by the metamaterial nanolens above the nanolens surface.

Image of FIG. 2.
FIG. 2.

(a) Bulk metamaterial (pink circle) manufactured in large scale ( in diameter or almost 3/4 the size of a U.S. penny). (b) 3D illustration of the nanoscale architecture of the nanolens. (c) Top view: SEM image showing the tips of the gold nanowires. The metamaterial nanolens consists of aligned gold nanowires, with 12 nm diameters and lattice spacing of 25 nm, embedded in porous alumina template matrix. (d) Side view: SEM image of the cross-section of the thick nanoporous alumina template without the gold nanowires. (e) Anisotropic optical property of the metamaterial: Negative permittivity in the nanowire axis direction and positive permittivity in the plane .

Image of FIG. 3.
FIG. 3.

(a) NSOM scan of the object of the two-slit object illuminated at 1550 nm. (b) NSOM scan of the corresponding image by the nanolens of the two-slit object. (c) The intensity profile of the source object (M-shape) and image (M-shape, noisy) are plotted. The results indicate that the metamaterial nanolens has a resolution of at least for the near-infrared spectral range. The intensity profile of the object as resolved by a diffraction-limited optical system is also plotted (Gaussian-like). The inset figure is an SEM image of the nanoslits.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Super-resolution imaging using a three-dimensional metamaterials nanolens