To meet the growing demand for design automation of metalens with inverse design capability, Synopsys has developed a powerful and user-friendly multi-domain design tool, MetaOptic Designer (MOD), that can handle lenses with subwavelength features. The optimization algorithm employs the well-known adjoint method, which can easily handle millions of design variables. The forward propagation is done by the efficient Fourier transform, also called angular spectrum method. The transfer function of each metalens is characterized by a parametric BSDF databases built with RCWA or FDTD. Application examples include achromatic metalens, large FOV metalens, reflective metalens, chiral hologram, and hybrid optical system.
A fully automated solution for designing metalens/metasurface systems has been developed to optimize the parameter values of each meta-atom on each metasurface based on the given inputs and desired targets. Unlike traditional design approaches, which are based on a given phase profile for a particular incident condition, inverse design can generate the optimum layout and its simulation results automatically based on a limited set of inputs from designers. The knowledge required of designers is minimized significantly. Hence, designers at different levels of expertise, including undergraduate students, can use this software solution to design metalens systems quickly.
Using waveguide to propagate images from micro displays to human eyes can effectively reduce the size and weight of AR equipment. For the optical design, we need grating structures to couple rays into or out of waveguide with sufficient uniformity while remaining the most efficienct. Additionally, enlarging the FOV (Field of View) and taking chromatically into account are important for offering an immersive experience for AR users. From the CAE tools perspective, the critical challenge is to consider the requirements all together. Hence, the key for waveguided AR design is a feasible design flow and comprehensive simulation tools to address the design challenges. We successfully integrated wave optics phenomenon into geometrical optics results to complete a waveguide AR glasses optimizing design by using Synopsys RSoft RCWA tool DiffractMOD, LightTools and parametric BSDF interface.
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