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Design and Analysis of Gratings

[Tuesday, 27. March 2018]

 

Micro- and nanostructures play an important role in optics, with ever growing impact. Gratings, as probably the most important group of such components, have their place in various optical setups as shown in previous newsletters.

In VirtualLab, gratings can be configured conveniently with the help of stacks, i.e. using a special medium definition.
Configuration of Grating Structures by Using Special Media

With the rigorous Fourier modal method (FMM), different types of gratings – e.g. blazed (sawtooth) …
Blazed Grating Analysis by FMM

… and holographic volume gratings – can be simulated,
Rigorous Simulation of Holographic Generated Volume Grating

and analyzed with helpful tools like the grating order analyzer.
Grating Order Analyzer

The technique applies to both linear and crossed gratings, as in the case of a non-paraxial 7x7 diffractive beam splitter.
Design and Analysis of Non-Paraxial Diffractive Beam Splitter

Vectorial effects are fully taken into account, as shown in the case of the ultrasparse nanowire grid polarizer.
Ultra-Sparse Dielectric Nano-Wire Grid Polarizers

By combination with the perfectly matched layer (PML) technique, aperiodic structures like nanocylinders can be analyzed as well.
Electromagnetic Field Interaction with Nanocylinders

The rigorous FMM is embedded in a global concept that groundbreakingly facilitates the analysis of micro- and nanostructures alongside other optical components, in larger, more complex optical systems.

Examples thereof can be found in, e.g., analysis of Czerny-Turner Setup including a blazed grating,
Czerny-Turner Setup

and modeling of high-NA microscope systems for examining different samples …
Imaging of Sub-Wavelength Gratings with Different Profiles

… or for wafer inspection.
Optical System for Inspection of Micro-Structured Wafer

Based on the FMM technique, the parametric optimization of micro- and nanostructures is enabled.

For example, the optimization of slanted gratings by varying the slant angle, grating depth, and filling factor, is done to obtain efficient incoupling.
Parametric Optimization and Tolerance Analysis of Slanted Gratings

Thanks to the new slanted grating configuration, all parameters of the slanted grating can be controlled with ease and flexibility.
Advanced Configuration of Slanted Gratings

Besides the versatile configuration for slanted gratings, there are more exciting things to discover in the latest release of VirtualLab Fusion: the non-sequential extension deserves a mention of honor.

An example on ghost image in a collimation system is constructed and modeled in a non-sequential manner.
Investigation of Ghost Imaging Effects in Collimation System

More examples on the non-sequential extension will be shown in the coming newsletters!

Want to give it a try yourself? Get your free trial download!

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