Among the various types of optical components, lenses are probably the most widely used and focusing is possibly the most typical task. Although it might seem trivial, the behavior of light in focal regions can be complex and thus deserving of in-depth investigation. As an example, in the case of focusing with a high-NA objective lens, the focal spot is well known to show asymmetry, and consideration of the vectorial nature of light turns out to be necessary. In VirtualLab, the properties of light in focal region can be thoroughly investigated with the help of different kinds of detectors, and with the ParameterRun function the field evolution through the focal region can be analyzed as well.Read more
Sources are yet another extensively customizable module in VirtualLab Fusion: you can adjust at will their wavelength spectrum, spatial coherence properties, transversal shape, and polarization, among others. Of all those, let us at present concentrate on the last two. You can find below a thorough tutorial on the Programmable Light source (which includes a detailed hands-on example) for you to follow, should you wish to learn to program your own sources. Additionally, we offer another example, in a more condensed format, that illustrates how to generate radially and azimuthally polarized light via programming.Read more
In our previous newsletter we already pointed to VirtualLab Fusion’s extremely modular nature, combined with its potential for customizability, as one of the fundamental strengths of the software, and went on to highlight programmable surfaces as just one instance thereof. We continue here in the same vein, only this time we move on to transmission functions: a well-known concept from Fourier optics – further enhanced by VirtualLab’s fully vectorial, electromagnetic approach – transmission functions constitute a good way to include idealized components in your optical system. Learn, with the help of the tutorial and examples listed below, how to program your own custom functions in VirtualLab Fusion!Read more
One of the fundamental strengths of the optical modeling and design software VirtualLab Fusion lies in its extremely modular approach: a gateway to provide maximum versatility to the user. This versatility is additionally turbocharged by the fact that many of the aforementioned modules which constitute VirtualLab allow for customization via data import or programming. In this newsletter we take a closer look at how to program custom surfaces. We present below a thorough tutorial on the topic which includes a simple example rolled out in-depth, and one additional programming sample for further illustration.Read more
Polarization effects often play an important role in modern optical research and engineering due to the vectorial nature of the electromagnetic field. Linear polarizers (e.g. wire grid polarizer) are probably the most commonly used optical elements for the manipulation of the polarization state. Although in most cases polarizers are designed for paraxial situations, they are also used in non-paraxial setups, e.g. in the focal region behind a high-NA lens or for the measurement of the Stokes parameters behind a highly tilted polarizer. In VirtualLab Fusion we provide a model for polarizers in non-paraxial cases. Moreover the simulation results obtained with VirtualLab show good agreement with the reference.Read more
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Gratings are widely used for various applications, such as spectrometers, near-eye display systems, etc. In the Grating Toolbox of VirtualLab, grating structures can be easily configured through a user-friendly software interface, and they can be rigorously analyzed using the Fourier modal method (FMM). This enables not only the calculation of diffraction efficiencies but also the investigation of polarization effects. For example, the polarization conversion for light diffraction at a sub-wavelength grating is investigated, and the results obtained from VirtualLab show good agreement with the reference.Read more
Imaging systems can be found in various optical applications and they may appear in different configurations.
Such systems can be easily set up in VirtualLab Fusion and their performance can be analyzed with e.g. the wavefront error detector. Especially, apertures in system are known to have an influence on imaging quality. VirtualLab can handle aperture effects properly and take them into consideration for the PSF/MTF calculation. As an example, such effects are demonstrated with a human eye model.