## Three-dimensional analysis of subwavelength diffractive optical elements with the finite-difference time-domain method

Applied Optics, Vol. 39, Issue 17, pp. 2871-2880 (2000)

http://dx.doi.org/10.1364/AO.39.002871

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### Abstract

We present a three-dimensional (3D) analysis of subwavelength diffractive optical elements (DOE’s), using the finite-difference time-domain (FDTD) method. To this end we develop and apply efficient 3D FDTD methods that exploit DOE properties, such as symmetry. An axisymmetric method is validated experimentally and is used to validate the more general 3D method. Analyses of subwavelength gratings and lenses, both with and without rotational symmetry, are presented in addition to a 2 × 2 subwavelength focusing array generator.

© 2000 Optical Society of America

**OCIS Codes**

(000.4430) General : Numerical approximation and analysis

(050.1970) Diffraction and gratings : Diffractive optics

**History**

Original Manuscript: August 3, 1999

Revised Manuscript: January 6, 2000

Published: June 10, 2000

**Citation**

Mark S. Mirotznik, Dennis W. Prather, Joseph N. Mait, William A. Beck, Shouyuan Shi, and Xiang Gao, "Three-dimensional analysis of subwavelength diffractive optical elements with the finite-difference time-domain method," Appl. Opt. **39**, 2871-2880 (2000)

http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-17-2871

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