4.6 Article

Planar metallic nanoscale slit lenses for angle compensation

Journal

APPLIED PHYSICS LETTERS
Volume 95, Issue 7, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.3211875

Keywords

image sensors; lenses; metallic thin films; nanophotonics; optical focusing

Funding

  1. Sharp Laboratories of America
  2. AFOSR-MURI program on plasmonics [FA9550-1-0437]
  3. MARCO interconnect focus center

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We demonstrate numerically, using a modified total-field/scattered-field formalism, that metallic lenses, based on arrays of nanoscale slits with varying widths in a planar metallic film, can be used to focus light and compensate for various angles of incidence. These structures could be used as integrated microlenses to improve the efficiency of pixels in solid-state image sensors. Our design guidelines simultaneously accomplish a prism and focusing action. Our results also indicate the importance of the aperture effect for such far-field focusing devices.

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