27 April 2016 Simulation and optimization of faceted structure for illumination
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Abstract
The re-direction of incoherent light using a surface containing only facets with specific angular values is proposed. A new photometric approach is adopted since the size of each facet is large in comparison with the wavelength. A reflective configuration is employed to avoid the dispersion problems of materials. The irradiance distribution of the reflected beam is determined by the angular position of each facet. In order to obtain the specific irradiance distribution, the angular position of each facet is optimized using Zemax OpticStudio 15 software.

A detector is placed in the direction which is perpendicular to the reflected beam. According to the incoherent irradiance distribution on the detector, a merit function needs to be defined to pilot the optimization process. The two dimensional angular position of each facet is defined as a variable which is optimized within a specified varying range. Because the merit function needs to be updated, a macro program is carried out to update this function within Zemax. In order to reduce the complexity of the manual operation, an automatic optimization approach is established. Zemax is in charge of performing the optimization task and sending back the irradiance data to Matlab for further analysis.

Several simulation results are given for the verification of the optimization method. The simulation results are compared to those obtained with the LightTools software in order to verify our optimization method.
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Lihong Liu, Lihong Liu, Thierry Engel, Thierry Engel, Manuel Flury, Manuel Flury, } "Simulation and optimization of faceted structure for illumination", Proc. SPIE 9889, Optical Modelling and Design IV, 98891A (27 April 2016); doi: 10.1117/12.2227200; https://doi.org/10.1117/12.2227200
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