[OPTICAL REVIEW Vol. 16, No. 4 (2009) 452-453]
© 2009 The Optical Society of Japan

Extension of Grid Separation in the Finite Difference Time Domain Analysis for Predicting Time-Resolved Reflectance of an Optical Pulse from Scattering Medium with Non-scattering Regions

Tadatoshi TANIFUJI

Department of Electrical and Electronics Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami, Hokkaido 090-8507, Japan

(Received January 15, 2009; Revised March 3, 2009; Accepted March 31, 2009)

Extension of grid separation in the finite difference time domain (FDTD) analysis has been proposed for predicting time-resolved reflectance of an optical pulse from scattering medium with non-scattering (clear) regions. Grid separation in the previous FDTD analysis formulated by the author was limited to less than 0.5 mm. By introducing the alternative boundary conditions proposed by the author at the surface of scattering medium, the grid separation limit has been extended up to 1 mm. As a result, necessary time to analyze time-resolved reflectance has been reduced to less than a sixtieth without degrading numerical accuracy.

Key words: diffusion equations, finite difference time domain (FDTD) analysis, scattering medium with non-scattering region, time-resolved reflectance

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