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Focusing of light by a nanohole array
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10.1063/1.2710775
/content/aip/journal/apl/90/9/10.1063/1.2710775
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/9/10.1063/1.2710775
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Quasicrystal sample and its reciprocal lattice. (a) Scanning electron microscopy image of a fragment of the quasicrystal array of holes. (b) Far-field diffraction pattern of the quasicrystal array, obtained with white light illumination. (c) Reciprocal lattice of the quasicrystal array wherein spot diameter is proportional to the magnitude of the spectral component. The minimum distance between two neighboring holes . Red dashed circles show several “partial” Montgomery rings. (d) Schematic of the experiment showing field pattern over the array illuminated with coherent light.

Image of FIG. 2.
FIG. 2.

(Color online) Field maps at different heights above the quasicrystal array of holes. Each scan is in area. The images were obtained by SNOM using illumination wavelengths of (left) and (right). Note the highly isolated hot spots observed at .

Image of FIG. 3.
FIG. 3.

(Color online) Subwavelength hot spots formed at different heights above the quasicrystal array. The illumination source is a diode laser with a wavelength of . (a) Field map at a height above the array. [(b) and (c)] Fine scan image of the hot spot indicated in map (a) and corresponding profiles of the focus along directions parallel (blue dots) and perpendicular (red dots) to the polarization of the incident light. (d) Field map at a height above the array. [(e) and (f)] Fine scan image of the hot spot indicated in map (d) and corresponding profiles of the focus along directions parallel (blue dots) and perpendicular (red dots) to the polarization of the incident light.

Image of FIG. 4.
FIG. 4.

Theoretical calculations at the conditions close to that of Fig. 2(c) show a pattern similar to that observed experimentally and give hot spots of in cross section.

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/content/aip/journal/apl/90/9/10.1063/1.2710775
2007-03-02
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Focusing of light by a nanohole array
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/9/10.1063/1.2710775
10.1063/1.2710775
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