Dispersive Sweatt Model for Broadband Lens Design with Metasurfaces

• DOI: 10.1364/opticaopen.27153618.v2
• Publication Date: 2024-10-21T19:22:22Z
• Authors: Ko-Han Shih; Christopher Renshaw; Weiyu Chen
• Keywords: Through-the-lens metering

The Sweatt model has been extensively used to design optical systems containing diffractive elements (DOEs) because it captures the dispersive characteristics of DOEs. We introduce a new Dispersive Model (DSM) that can describe meta-atom (MA) dispersion which material and geometric contributions in addition diffraction. It uses wavelength-dependent scalar coefficient modify given MA basis. This provides robust framework metasurface (MS) while including their unique properties optimization. Importantly, DSM is based on ray-optics enables MS-containing using conventional software such as Zemax Code V. use demonstrate hybrid refractive/MS achromatic doublet for midwave infrared (MWIR) band. example includes multiple wavelengths field-angles during optimization demonstrates excellent agreement between real lens performance modelled wave-optics. discuss limits present simple predict due phase mismatch at Fresnel zone boundaries.<p></p>