Ultra-Broadband Dispersion-Manipulated Dielectric Metalenses by Nonlinear Dispersive Phase Compensation

TL;DR

This paper introduces a nonlinear dispersive phase compensation technique for designing ultra-broadband, polarization-insensitive dielectric metalenses that operate from 400 nm to 1000 nm, enabling advanced spectral imaging.

Contribution

The study presents a novel nonlinear phase compensation approach that overcomes linear limitations, allowing for ultra-broadband dispersion manipulation in metasurfaces for imaging and spectral detection.

Findings

Achromatic metalenses from 400 nm to 1000 nm achieved

Method enables arbitrary dispersion modulation

Applicable to spectral detection and chromatography imaging

Abstract

Dispersion decomposes compound light into monochromatic components at different spatial locations, which needs to be eliminated in imaging but utilized in spectral detection. Metasurfaces provide a unique path to modulate the dispersion only by adjusting the structural parameters without changing the material as required for refractive elements. However, the common linear phase compensation does not conform to the dispersion characteristics of the meta-unit limiting dispersion modulation in broader wavelength bands, which is desired for ultra-broadband or multiband imaging. Here, we propose a nonlinear dispersive phase compensation method to design polarization-insensitive achromatic metalenses from 400 nm to 1000 nm constructed with single-layer high aspect ratio nanostructures. This band matches the response spectrum of a typical CMOS sensor for both visible and near-infrared imaging applications without additional lens replacement. Moreover, the capability of the method in achieving arbitrary dispersion modulation is demonstrated for applications such as chromatography imaging and spectral detection.