NEWS

Invitation to LASER World of PHOTONICS

(June 12, 2017)

Our teams at Wyrowski Photonics and LightTrans are operating at full stretch for the last sprint in the preparation for the LASER World of PHOTONICS, which is taking place in Munich from June 26 till 29, 2017. We are very excited to inform you that this event will mark the unveiling of our momentous...

New on Youtube: "Getting Started" VirtualLab Fusion Tutorials

(April 04, 2017)

The channel is a common platform of the Applied Computational Optics Group of the Institute of Applied Physics (Friedrich-Schiller-University), and the companies Wyrowski Photonics and LightTrans International. Here we will provide you with short videos on the theory and concepts of an exciting new ...

VirtualLab training courses in Jena in September 2017

(March 02, 2017)

LightTrans offers its new VirtualLab training courses: "Introduction to VirtualLab Fusion", September 18-19, 2017 "Analysis and Design of Diffractive and Micro Optical Systems”, September 20-22, 2017 NEW: "Introduction to VirtualLab Programming”, September 25, 2017 Deadli...

Rigorous analysis and design of 2D and 3D gratings

Surface profile of a 3D sub-wavelength grating used as antireflection structure.

The VirtualLab Grating Toolbox enables the rigorous electromagnetic analysis and design of 2D and 3D gratings including diffraction gratings, holographic gratings, Bragg gratings, surface gratings, photonic crystals, diffractive beam splitters, polarizers, antireflection structures, diffractive optical elements, photovoltaic systems, and spectroscopic gratings. Gratings may contain features from nanometer to millimeter scale. Diffraction efficiency, near field, polarization, reflectance, transmittance, absorption and the field inside gratings can be calculated. Various customization features allow the analysis and optimization of gratings with user defined structures. These include the import of measured height profiles, as well as programmable height profiles and media which allow to enter a formula describing a height profile or a refractive index distribution.

In addition grating structures can be constructed by building stacks of surfaces and homogeneous as well as inhomogeneous media. The powerful design feature of VirtualLab enables the local and global parametric optimization of gratings. The investigation of tolerances is possible by the parameter run.

Your Benefit

Customized 2D grating defined as a stack of surfaces and index modulations.
Customized 2D grating defined as a stack of surfaces and index modulations.
  • Rigorous and approximated electromagnetic analysis and design of gratings including diffraction gratings, holographic gratings, Bragg gratings, surface gratings, photonic crystals, diffractive beam splitters, polarizers, antireflection structures, diffractive optical elements, photovoltaic systems, and spectroscopic gratings.
  • 2D and 3D gratings with feature sizes from nanometer to millimeter scale.
  • Calculation of diffraction orders, efficiency, near field, polarization, reflectance, transmittance, absorption and field inside grating.
  • Rigorous analysis of gratings for general illumination waves.
  • Investigation of tolerances, parameter variations and parametric optimization.

Selected Features

Surface profile of 2D sinusoidal grating.

Analysis of 2D and 3D gratings. The Grating Toolbox is using the Fourier Modal Method for a rigorous analysis of 2D and 3D gratings. A rigorous analysis can be done for plane waves or general incident waves. Predefined gratings as for example sinusoidal, triangular, sawtooth, holographic gratings as well as customized grating structures can be modeled. Typical applications are the analysis of polarizers, spectroscopic gratings, diffractive beam splitters, photonic crystals, gratings for fiber coupling, sub-wavelength gratings, moth-eye structures, artificial media and zeroth-order gratings.

Pyramid type 3D surface grating
Pyramid type 3D surface grating

Customized 2D and 3D gratings. The Grating Toolbox supports the import of measured 1D and 2D height profiles. Furthermore, programmable interfaces and programmable media allow to enter a formula describing a height profile or the distribution of the refractive index. The stack concept enables the description of gratings as a sequence of surfaces as well as homogeneous and inhomogeneous media.

Field inside triangular 2D surface grating.
Field inside triangular 2D surface grating.

Evaluation of field distributions. Depending on grating applications, various evaluations of simulation results are required. This includes for example the calculation of diffraction orders, efficiencies, near field, polarization, reflectance, transmittance, absorption and field inside grating.

Tolerance analysis and optimization of gratings. The powerful parameter run of VirtualLab enables the variation of a single parameter, the multidimensional scanning parameter variation and a random (Monte-Carlo) parameter variation in order to investigate the effects of tolerances . VirtualLab enables the design of predefined and customized grating structures by parametric optimization.

Reflectance of 3D sub-wavelength pillar type medium.

Reflectance of 3D sub-wavelength pillar type medium.