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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 38, Iss. 15 — Aug. 1, 2013
  • pp: 2702–2704

Hyperbolic secant slit lens for subwavelength focusing of light

A. G. Nalimov and V. V. Kotlyar  »View Author Affiliations


Optics Letters, Vol. 38, Issue 15, pp. 2702-2704 (2013)
http://dx.doi.org/10.1364/OL.38.002702


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Abstract

Using the finite-difference time-domain simulation, we show that if a gradient-index or binary planar dielectric microlens that focuses light at the output surface has a near-focus subwavelength slit the focal spot width is determined by the slit width. Notably, the slit allows the output light proportion to be increased due to the surface wave scattering, thus forming a focal spot nearly devoid of side lobes. In this work, the focal spot width of λ/23 and the diffraction efficiency of focusing of 44% are achieved.

© 2013 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(260.1960) Physical optics : Diffraction theory
(050.5298) Diffraction and gratings : Photonic crystals

ToC Category:
Diffraction and Gratings

History
Original Manuscript: May 17, 2013
Manuscript Accepted: June 17, 2013
Published: July 23, 2013

Citation
A. G. Nalimov and V. V. Kotlyar, "Hyperbolic secant slit lens for subwavelength focusing of light," Opt. Lett. 38, 2702-2704 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-15-2702


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