## A compact source condition for modelling focused fields using the pseudospectral time-domain method |

Optics Express, Vol. 22, Issue 5, pp. 5599-5613 (2014)

http://dx.doi.org/10.1364/OE.22.005599

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### Abstract

The pseudospectral time-domain (PSTD) method greatly extends the physical volume of biological tissue in which light scattering can be calculated, relative to the finite-difference time-domain (FDTD) method. We have developed an analogue of the total-field scattered-field source condition, as employed in FDTD, for introducing focussed illuminations into PSTD simulations. This new source condition requires knowledge of the incident field, and applies update equations, at a single plane in the PSTD grid. Numerical artifacts, usually associated with compact PSTD source conditions, are minimized by using a staggered grid. This source condition’s similarity with that used by the FDTD suggests a way in which existing FDTD codes can be easily adapted to PSTD codes.

© 2014 Optical Society of America

**OCIS Codes**

(110.4500) Imaging systems : Optical coherence tomography

(170.3660) Medical optics and biotechnology : Light propagation in tissues

(180.0180) Microscopy : Microscopy

(050.1755) Diffraction and gratings : Computational electromagnetic methods

**ToC Category:**

Scattering

**History**

Original Manuscript: January 2, 2014

Revised Manuscript: February 13, 2014

Manuscript Accepted: February 21, 2014

Published: March 4, 2014

**Virtual Issues**

Vol. 9, Iss. 5 *Virtual Journal for Biomedical Optics*

**Citation**

Peter R.T. Munro, Daniel Engelke, and David D. Sampson, "A compact source condition for modelling focused fields using the pseudospectral time-domain method," Opt. Express **22**, 5599-5613 (2014)

http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-22-5-5599

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