Wavelength-agnostic metasurface design for next-generation 2D photodetectors.

This research presents a versatile method for designing two-dimensional photonic crystal-based dielectric metasurfaces. We optimize their geometric patterns to achieve specific functionalities like near-perfect absorption at chosen wavelengths. This technique can also be applied to tailor reflectance and transmittance for any optical mode and wavelength. Our method combines covariance matrix adaptation (CMA) and rigorous coupled wave analysis (RCWA) for efficient design and optimization. We demonstrate its effectiveness by realizing simple, high-performance structures using conventional materials. This approach holds promise for applications in quantum technologies, optical communication, and nonlinear optics.