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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 1 — Jan. 14, 2013
  • pp: 87–101

Computation of tightly-focused laser beams in the FDTD method

İlker R. Çapoğlu, Allen Taflove, and Vadim Backman  »View Author Affiliations


Optics Express, Vol. 21, Issue 1, pp. 87-101 (2013)
http://dx.doi.org/10.1364/OE.21.000087


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Abstract

We demonstrate how a tightly-focused coherent TEMmn laser beam can be computed in the finite-difference time-domain (FDTD) method. The electromagnetic field around the focus is decomposed into a plane-wave spectrum, and approximated by a finite number of plane waves injected into the FDTD grid using the total-field/scattered-field (TF/SF) method. We provide an error analysis, and guidelines for the discrete approximation. We analyze the scattering of the beam from layered spaces and individual scatterers. The described method should be useful for the simulation of confocal microscopy and optical data storage. An implementation of the method can be found in our free and open source FDTD software (“Angora”).

© 2013 OSA

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(180.1790) Microscopy : Confocal microscopy
(210.0210) Optical data storage : Optical data storage
(050.1755) Diffraction and gratings : Computational electromagnetic methods

ToC Category:
Physical Optics

History
Original Manuscript: October 8, 2012
Revised Manuscript: December 2, 2012
Manuscript Accepted: December 3, 2012
Published: January 2, 2013

Virtual Issues
Vol. 8, Iss. 2 Virtual Journal for Biomedical Optics

Citation
İlker R. Çapoğlu, Allen Taflove, and Vadim Backman, "Computation of tightly-focused laser beams in the FDTD method," Opt. Express 21, 87-101 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-1-87


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