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Proceedings Paper

A combined simulation approach using ray-tracing and finite-difference time-domain for optical systems containing refractive and diffractive optical elements
Author(s): Christian Sommer; Claude Leiner; Susanne Schweitzer; Franz-Peter Wenzl; Ulrich Hohenester; Paul Hartmann
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Paper Abstract

Optical and photonic devices often comprise optical elements which interact with light on different geometric length scales, ranging from (sub-)wavelength to several millimetres. Well-established physical models exist to describe coherent or incoherent effects, like refraction or diffraction including polarization effects, which form the basis for several simulation approaches. While at dimensions much larger than the light wavelength the incoherent ray-tracing (RT) techniques are commonly used, at dimensions in the (sub)-wavelength regime simulation tools like the Finite- Difference Time-Domain (FDTD) method are indispensable, as they allow for the simulation of coherence effects where phase relations play a crucial role. The two approaches are structurally entirely different, so that a proper description for the macroscopic and the (sub-)wavelength scale at once would only work by connecting the two approaches together, exploiting the best of both in a step-by-step simulation. In this contribution, the applicability of an interface procedure for combined ray-tracing and FDTD simulations of optical systems which contain two diffractive gratings is discussed. Suchlike systems require multiple FDTD↔RT steps for a complete simulation. For minimizing the error due to the loss of the phase information in an FDTD→RT step, we use a recently derived equation for calculating the maximal coherence correlation function (MCCF) to estimate the minimum distance between the different grating structures. In addition a waveguide system comprising two coupling grating structures is investigated with the MCCF and simulated using the simulation approach. As a consequence of the waveguide setup multiple FDTD↔RT steps in an iterative manner are necessary; the corresponding results are discussed.

Paper Details

Date Published: 12 September 2014
PDF: 11 pages
Proc. SPIE 9193, Novel Optical Systems Design and Optimization XVII, 91930F (12 September 2014); doi: 10.1117/12.2061743
Show Author Affiliations
Christian Sommer, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Claude Leiner, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Susanne Schweitzer, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Franz-Peter Wenzl, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Ulrich Hohenester, Karl-Franzens-Univ. Graz (Austria)
Paul Hartmann, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)


Published in SPIE Proceedings Vol. 9193:
Novel Optical Systems Design and Optimization XVII
G. Groot Gregory; Arthur J. Davis, Editor(s)

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