Doublet metalens design for high numerical aperture and simultaneous correction of chromatic and monochromatic aberrations

Abstract

Metalens is one of the most prominent applications among metasurfaces since it gives possibilities to replace the conventional lenses for compactness and multi-functionalities. Recently, many studies have been demonstrated to overcome the aberrations of the metalenses for high performance practical applications. Previous studies have used the methods that control the dispersion of meta-atoms for correcting chromatic aberrations and use doublet platform for correcting monochromatic aberrations. Despite these studies and the large demands for simultaneous correction of the aberrations in high numerical aperture metalens, the simultaneous correction has not been demonstrated yet. In this paper, we report the doublet metalens design with high numerical aperture which corrects longitudinal chromatic aberration and four monochromatic aberrations including spherical aberration, coma, astigmatism, and field curvature simultaneously for the three primary visible colors. Based on the novel doublet platform, the multi-wavelength targeted correction lens and geometric phase lens with color filtering functionality are utilized. Our doublet metalens has numerical apertures of 0.33, 0.38, and 0.47 for 445 nm, 532 nm, and 660 nm, respectively. The back focal length of our doublet metalens remains nearly 360 µm for target wavelengths and incident angles up to 30 degrees.

Polarization-dependent asymmetric transmission using a bifacial metasurface

“…Finally, in terms of applicability, we expect that this scheme can be more useful in designing novel optical setups and can be compatible in various conventional setups, which would lighten the weight of optical devices. [41][42][43][44]…”

Dielectric Metalens: Properties and Three-Dimensional Imaging Applications

“…Inspired from the above early studies on chromatic and monochromatic aberration compensations, C. Kim et al ( Figure 5 d) reported doublet metalens optimization research [ 26 ]. In the study, the authors found that simultaneous correction of LCA, transverse chromatic aberration (TCA), and the five monochromatic aberrations is almost impossible in the doublet p-Si metalens.…”

“…( ii ) Captured sample images and corresponding ( iii ) modulation transfer functions for sagittal (dashed lines) and tangential (solid lines) ray directions. ( d ) Doublet silicon metalens optimization for simultaneous correction of chromatic and monochromatic aberrations at the three colors [ 26 ]. ( i ) Concept diagram, ( ii ) color filtering efficiency of the backside metalens, and ( iii ) optimized performance comparison.…”

“…Reprinted with permission from ( a ) [ 19 ] Copyright 2018 Springer Nature, ( b ) [ 20 ] Copyright 2018 Springer Nature, and ( c ) [ 25 ] Copyright 2016 Springer Nature. Reprinted with permission from ( d ) [ 26 ] Copyright The Optical Society and ( e ) [ 27 ] Copyright The Optical Society.…”

Recent Progress on Ultrathin Metalenses for Flat Optics

“…Compared to conventional refractive or diffractive lenses (Lalanne et al, 1999;Khorasaninejad et al, 2015;Lin et al, 2014), the physical working principles of metalenses are more diverse, so they present additional ways to rectify unwanted aberration. Metalenses even offer a way to solve both monochromatic and achromatic focusing problems simultaneously (Kim et al, 2020c;Arbabi et al, 2016a).…”