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Proceedings Paper

A simulation procedure for light-matter interaction at different length scales
Author(s): Claude Leiner; Wolfgang Nemitz; Franz P. Wenzl; Paul Hartmann; Ulrich Hohenester; Christian Sommer
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Paper Abstract

The development of photonic devices with tailor-made optical properties requires the control and the manipulation of light propagation within structures of different length scales, ranging from sub-wavelength to macroscopic dimensions. However, optical simulation at different length scales necessitates the combination of different simulation methods, which have to account properly for various effects such as polarization, interference, or diffraction: At dimensions much larger than the wavelength of light common ray-tracing (RT) techniques are conveniently employed, while in the subwavelength regime more sophisticated approaches, like the so-called finite-difference time-domain (FDTD) technique, are needed. Describing light propagation both in the sub-wavelength regime as well as at macroscopic length scales can only be achieved by bridging between these two approaches. In this contribution we present on the one hand a study aiming at the determination of the intermediate size range for which both simulation methods are applicable and on the other hand an approach for combining classical ray-tracing with FDTD simulation in order to handle optical elements of large sizes. Generally, the interface between RT and FDTD is restricted to very small sample areas. Nevertheless, many real world optical devices use e.g. diffractive optical elements (DOEs) having comparably large areas in the order of 1-2 mm² (or larger). Therefore, one has to develop strategies in order to handle the data transfer between FDTD and RT also for structures of such larger size scales. Our approach in this regard is based on the symmetries of the structures. In this way support programs like e.g. MATLAB can be used to replicate the near-field of a single structure and to merge it to the near-field of a larger area. Comparisons of RT and FDTD simulations in the far-field can be used to validate the physical correctness of this approach. With such procedure it is possible to optimize light propagation effects at both the macro- and microscale and to exploit their whole potential for the manipulation and optimization of optical and photonic devices.

Paper Details

Date Published: 4 May 2012
PDF: 8 pages
Proc. SPIE 8429, Optical Modelling and Design II, 84290L (4 May 2012); doi: 10.1117/12.922404
Show Author Affiliations
Claude Leiner, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Wolfgang Nemitz, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Franz P. Wenzl, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Paul Hartmann, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Ulrich Hohenester, Karl-Franzens-Univ. Graz (Austria)
Christian Sommer, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)


Published in SPIE Proceedings Vol. 8429:
Optical Modelling and Design II
Frank Wyrowski; John T. Sheridan; Jani Tervo; Youri Meuret, Editor(s)

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