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Planar metallic nanoscale slit lenses for angle compensation
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10.1063/1.3211875
/content/aip/journal/apl/95/7/10.1063/1.3211875
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/7/10.1063/1.3211875
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Motivation for focusing with angle compensation. (a) Schematic of conventional camera with short focal length objective lens (all microlenses are identical). Pixels on the periphery have reduced efficiency and more crosstalk. (b) Proposed architecture: optically thick planar metallic lenses compensate for the angle of incoming light.

Image of FIG. 2.
FIG. 2.

Planar metallic lens with angle compensation. (a) Geometry of the lens made from gold film (yellow) with air slits (light blue) on silica substrate (dark blue). (b) The phase delay (up to an arbitrary constant) from Eq. (2) (blue line), mimicked by the array of slits (red dots) (slit sequence: 18, , , , , 100, 62, 46, 40, 34, 30, 28, , , and spaced 40 nm apart). 2D FDFD magnetic field (c) and magnetic field intensity pattern (d). The gray lines indicate the boundary between total-field and scattered-field region. In order to show the features of the focus clearly, the intensity pattern is shown saturated near and inside the slits.

Image of FIG. 3.
FIG. 3.

Planar metallic lenses compensating for different angles. The phase delay required (blue line) for (a) (slit sequence: 100, 44, 34, 28, 26, , 20, , , , , , and ), (b) (slit sequence: 72, 38, 28, 24, 20, 18, 16, , , , 100, 58, 44, 36, 32, 28, 26, , 22, and 20 nm), and (c) (slit sequence: 94, 36, 26, 22, 18, 16, , , , 100, 44, 34, 28, 24, 22, 20, 18, , , and ) angle compensation and focusing, and as mimicked by a slit array (red dots). FDFD simulated focusing patterns [(d)–(f)].

Image of FIG. 4.
FIG. 4.

Nanoscale prism compensating for a angle. (a) Geometry of the structure (same parameter space as Fig. 2 ). (b) The required phase delay (blue line), mimicked by the array of slits (red dots) (slit sequence: 100, 48, 34, 28, 24, 20, 18, 16, , , , 100, 50, 36, 28, 24, 20, 18, , and ). FDFD magnetic field (c) and magnetic field intensity pattern (d).

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/content/aip/journal/apl/95/7/10.1063/1.3211875
2009-08-21
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Planar metallic nanoscale slit lenses for angle compensation
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/7/10.1063/1.3211875
10.1063/1.3211875
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