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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 33 — Nov. 20, 2012
  • pp: 7969–7981

Asymmetrically filled slits in a metal film that split a light beam into two depending on its wavelength

Danhong Huang and L. David Wellems  »View Author Affiliations


Applied Optics, Vol. 51, Issue 33, pp. 7969-7981 (2012)
http://dx.doi.org/10.1364/AO.51.007969


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Abstract

By applying a scattering-wave theory, the electromagnetic response of an arbitrary array of multiple slits perforated on a metallic film and filled with different slit dielectric materials can be studied in an analytical way. Here, the wavelength-dependent splitting of a light beam into two by asymmetrically filled slits in a metal film using intraslit and interslit dual-wave interferences is fully explored. We consider a triple-slit structure perforated on a gold film, where the middle slit is used for the surface-plasmon (SP) excitation by a narrow Gaussian beam while the two side slits are used for the detection of a transmitted SP wave propagated from the middle opaque slit either at a particular wavelength or at double that wavelength, respectively. For this proposed simple structure, we show that only one of the two side observation slits can be in a passing state for a particular wavelength, but the other blocked slit will change to a passing state at double that wavelength with a specific design for the slit depth, slit dielectric, and interslit distance in the deep subwavelength regime. In this sense, SP mediated light transmission becomes wavelength sensitive in our model, and a single light beam can be separated into two according to its wavelength in the transverse direction parallel to the array. This provides us with a unique way for direct optical reading in the near-field region using a nonspectroscopic approach.

© 2012 Optical Society of America

OCIS Codes
(220.0220) Optical design and fabrication : Optical design and fabrication
(240.0240) Optics at surfaces : Optics at surfaces

ToC Category:
Optics at Surfaces

History
Original Manuscript: July 11, 2012
Revised Manuscript: October 2, 2012
Manuscript Accepted: October 3, 2012
Published: November 19, 2012

Citation
Danhong Huang and L. David Wellems, "Asymmetrically filled slits in a metal film that split a light beam into two depending on its wavelength," Appl. Opt. 51, 7969-7981 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-33-7969


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