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Optical Engineering

Sharp focus light simulation in a planar gradient secant lens
Author(s): Anton G. Nalimov; Viktor V. Kotlyar; Alexander A. Kovalev
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Paper Abstract

The simulation of light focusing by a gradient, secant-plane lens was performed. The simulation using a finite-difference time-domain method shows that by combining the gradient-index hyperbolic secant (HS) lens with a subwavelength diffraction grating or by replacing the lens with its binary analog, the focal spot size can be reduced by 10% and 20%, respectively, with respect to the diffraction-limited resolution in the two-dimensional medium. We design a planar, binary-silicon HS microlens that generates a near-surface focal spot with a full-width, half-maximum diameter equal to 0.102λ and almost without sidelobes. It is shown that about 10% of the incident beam total power goes to the far-field zone.

Paper Details

Date Published: 7 March 2013
PDF: 8 pages
Opt. Eng. 52(9) 091705 doi: 10.1117/1.OE.52.9.091705
Published in: Optical Engineering Volume 52, Issue 9
Show Author Affiliations
Anton G. Nalimov, Image Processing Systems Institute (Russian Federation)
Viktor V. Kotlyar, Image Processing Systems Institute (Russian Federation)
Alexander A. Kovalev, Image Processing Systems Institute (Russian Federation)


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