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American Journal of Physics -- February 2012 -- Volume 80, Issue 2, pp. 122

Near-field light focusing by a slit array in a planar metal film with nonuniform slit dielectric material

L. David Wellems and Danhong Huang

Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117

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We study the interference of evanescent electromagnetic waves generated from multi-slits in a metal film and demonstrate the anomalous bending of light at infrared frequencies due to negative refraction. We also calculate the diffraction of an incident plane electromagnetic waves by a metallic film with an arbitrary linear array of slits, slit separation, and slit dielectric material. In contrast to a double-convex shaped quartz lens, we show that a planar metallic film with a one-dimensional slit array can also focus polarized light in the near-field region when either the slit width or the slit dielectric material becomes spatially nonuniform.

© 2012 American Association of Physics Teachers

ACKNOWLEDGMENTS

The authors would like to thank the Air Force Office of Scientific Research for its support. They would also like to thank Dr. Dave Cardimona for his critical reading of this manuscript.

Article Outline

  1. INTRODUCTION
  2. THEORY
    1. s polarization
    2. p polarization
  3. NUMERICAL RESULTS
    1. Interference of slit evanescent waves
    2. Light focusing by a planar metallic lens
  4. CONCLUSIONS

KEYWORDS and PACS

Keywords

dielectric function, dielectric materials, light diffraction, light interference, light refraction, metallic thin films, optical focusing, physics education

PACS

  • 40.00.00

    ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS

RELATED DATABASES

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History
Received Jun 2011
Accepted Sep 2011

PUBLICATION DATA

ISSN

0002-9505 (print)  
1943-2909 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Association of Physics Teachers

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1119/1.3652700

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