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Using Volume Gratings as Angular Filters

[August 27, 2020]
Following the work of K. Bang et al., we construct volume gratings in VirtualLab Fusion and analyze their angular response.
[August 27, 2020]

Volume gratings, due to their high spectral and angular sensitivities, can, in turn, be designed to function as either spectral or angular filters. Following the work of K. Bang et al., we construct such volume gratings in VirtualLab Fusion and analyze their angular response. In comparison to traditional spatial filtering employing a 4-f system, volume gratings can be integrated in complex systems compactly. As an example, we use a volume grating to suppress the higher diffraction orders of a DOE and demonstrate the effect.

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Register now for our next Webinar

[August 25, 2020]
Register now for our next webinar: Modeling and Design of Metagratings. Take part on 2 September and get deeper insights.
[August 25, 2020]

We would like to invite you to take part in our next VirtualLab Fusion webinar. In order to adapt to different time zones worldwide, we will hold this webinar twice.

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Talbot Lithography

[August 20, 2020]
We demonstrate, at examples, how to model randomly/un-polarized light for grating simulation in VirtualLab Fusion.
[August 20, 2020]

The Talbot effect, as one of the most well-known diffraction effects, can be used in lithography to produce periodic nanostructures. Following the work of I.-H. Lee et al., we construct a conical grating mask on a hexagonal grid, and simulate the generation of Talbot images in a depth-wise manner. Particularly, since the UV light employed in the lithography process is unpolarized, we demonstrate, at examples, how to model unpolarized light for grating simulation in VirtualLab Fusion.

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Metagratings for Large-Angle Beam Splitting

[August 14, 2020]
We demonstrate how metagratings can be constructed, modeled, and optimized in VirtualLab Fusion.
[August 14, 2020]

Dot-projection optical elements can be found in an ever-growing number of devices, like in the LiDAR of Apple’s new iPad Pro with depth-detecting capability. A beam-splitting grating plays a crucial role in these applications, and the design of such gratings for non-paraxial cases is challenging. Metagratings, because of the unique way in which a nanopillar manipulates the electromagnetic field, can provide additional design possibilities. We demonstrate how such gratings can be constructed, modeled, and optimized in VirtualLab Fusion.

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Blazed Metagrating Design

[August 07, 2020]
Following the work of P. Lalanne et al. – pioneers in the field of metasurface research – we construct a blazed metagrating and optimize it in VirtualLab Fusion.
[August 07, 2020]

Metagratings and more general metasurfaces are starting to draw ever more attention in different applications. They are known for maintaining a high diffraction efficiency in non-paraxial situations. Polarization-insensitive designs are possible with an appropriate selection of the types of nanopillars as the unit cells for the metagrating. Following the work of P. Lalanne et al. – pioneers in the field of metasurface research – we construct a blazed metagrating and optimize it in VirtualLab Fusion.

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Highly Efficient Gratings for Ultrashort Pulses

[July 31, 2020]
We demonstrate, according to T. Clausnitzer et al., how to build up a pulse stretching or compression system with two transmission gratings. Especially, we analyze the polarization dependency of such systems.
[July 31, 2020]

Ultrashort pulses prove helpful in many modern applications. To manipulate ultrashort pulses, especially for high-power cases, gratings are often employed to either stretch or compress the pulses. The design of such gratings needs careful consideration: they should maintain high efficiency over a spectrum band, and sometimes even for random polarization. In VirtualLab Fusion, you can design gratings using FMM/RCWA, insert the gratings into a setup with pulsed laser sources for system performance evaluation. We demonstrate with the examples below.

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Analyzing Resonant Waveguide Gratings

[July 24, 2020]
We apply the Fourier modal method (FMM / RCWA) within VirtualLab Fusion to analyze resonant waveguide gratings rigorously and demonstrate how to check the resonant effects with focused Gaussian beams.
[July 24, 2020]

Resonant waveguide gratings are used for various applications due to their sensitivity to wavelength and polarization. We pick an example from the work of G. Quaranta et al. and analyze its diffraction properties in VirtualLab Fusion. Additionally, we investigate the angular selectivity/sensitivity of the selected resonant waveguide grating, and visualize the diffraction pattern behind it.

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Demonstrating Abbe’s Resolution Theory

[July 20, 2020]
As was done first by Abbe we will demonstrate the theory of resolution in VirtualLab Fusion. We build up an imaging system with real chromium gratings as the object, and demonstrate the image formation throughout the system.
[July 20, 2020]

How to resolve better is one of the most important, and most prevalent, question in optics. Ernst Abbe gave his explanation on resolution in 1873 and his theory has played a role to this day. As was done first by Abbe, and then by many other scientists in their labs, we will demonstrate the theory of resolution in VirtualLab Fusion. Thanks to the grating component released in version 2020.1, we build up an imaging system with real chromium gratings as the object, and demonstrate the image formation throughout the system.

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