Design an Optimal Diffractive Grating with Ansys Lumerical FDTD and Zemax OpticStudio

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As demand for AR and VR technology grows, design of high-quality diffractive optical elements remains a key challenge. In this webinar, Zemax CTO Sanjay Gangadhara and Lumerical, an Ansys Company’s James Pond demonstrate how to design and simulate optimal diffractive gratings using Ansys Lumerical FDTD and Zemax’s OpticStudio. While previous webinars on FDTD-OpticStudio interoperability have focused on data exchange interfaces for EM fields and ray sets, this webinar focuses on a new grating calculator that automatically calculates a diffraction grating’s complex transmission and reflection coefficients in FDTD to be shared via data exchange with OpticStudio. This interoperability offers an invaluable workflow for the development of diffractive grating-based optical systems requiring high efficiency for certain orders and wavelengths while minimizing stray light effects.

The webinar begins with an overview of the various applications in which diffraction gratings are becoming prevalent as a part of optical design, including AR and VR technologies. We’ll then discuss using the new grating calculator to create gratings with high efficiency for desired diffraction orders while minimizing stray light effects into unintended orders. Ansys Lumerical FDTD will be executed on an industrially relevant AR example to maximize the first-order reflection for a narrow wavelength range in the visible spectrum, while keeping a high transmission in the full spectrum. Although AR will be the example application, the techniques demonstrated in the webinar are transferable to other diffraction grating-based applications such as heads-up displays, diffractive lenses, and spectrometer systems.

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