In this step, we sweep the height and radius of the nanorod and obtain the transmission, phase, and near-field. Step 2: Unit cell simulations with RCWA – Height and radius sweep However, we can design the ideal phase mask in OpticStudio using ray tracing and optimization capabilities for more complex systems where analytical solutions don't exist or would be hard to calculate. For the most common lens types, such as spherical or cylindrical elements, we can use the known analytical solutions. The first step is to define the target phase profile for the metalens. With the knowledge of the phase in terms of the geometry parameters, it is possible to create a metalens with an arbitrary phase profile by placing the meta-atoms at the necessary positions. ![]() By adjusting the geometry of these unit cell elements, one can modify the phase changes experienced by the propagating field. Metalenses consist of carefully arranged "unit cells" or "meta-atoms" with sub-wavelength structures. Understand the simulation workflow and key results The design is verified in Ansys RCWA (Rigorous Coupled-Wave Analysis) and OpticStudio through near- and far-field analyses. ![]() The radius and the arrangement of the nanorods are tailored to create a desired phase profile on the metalens surface. The goal of this example is to design a diffractive metalens consisting of cylindrical nanorods.
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