Lightguide structures play a role in various applications nowadays, from integrated optics to modern display technology. Coupling light out of or into the lightguide is therefore an issue of concern for all lightguide-based applications. Such tasks are usually realized with diffractive gratings, since they can be integrated with the lightguide using modern fabrication techniques. In VirtualLab Fusion, the coupling efficiency can be rigorously calculated with the Fourier modal method (FMM). As an example, we analyzed several selected slanted gratings, and the simulation results show good agreement with those from literature.
Analysis of Slanted Gratings for Lightguide Coupling
Different slanted grating geometries are selected from literature, with varying slant angle, fill factor, and modulation depth. The diffraction efficiencies are calculated with the Fourier modal method (FMM).
Customized Detector for Lightguide Coupling Grating Evaluation
We present a customized detector which calculates the grating diffraction efficiencies over a user-defined incident-angle range, and also delivers the mean value and contrast of the efficiencies.
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Newsletter/News LightTrans, VirtualLab, lightguide, coupling In VirtualLab Fusion, the coupling efficiency can be rigorously calculated with the Fourier modal method (FMM). As an example, we analyzed several selected slanted gratings, and the simulation results show good agreement with those from literature.
