Journal
PHYSICA SCRIPTA
Volume 98, Issue 8, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1402-4896/ace6e0
Keywords
oblique incidence; sub-diffraction; broadband; metalens
Categories
Ask authors/readers for more resources
Lenses with sub-diffraction focusing are widely used in advanced optical imaging and microscopy. However, oblique incidence light can cause aberrations for high-NA metalenses. In this study, a high-NA (0.97) metalens design approach is demonstrated to provide sub-diffraction focusing for oblique incidence and broadband operation. The metalens is capable of sub-diffraction focusing over the wavelength range 600-750 nm and is ultra-thin and easy to integrate.
Lenses with sub-diffraction focusing are extensively used in advanced optical imaging and microscope. Due to the longitudinal electric component, the radially polarized beam could offer sub-diffraction focusing by high-numerical-aperture (NA) lenses. However, slightly oblique incidence light could pose serious off-axis aberrations for high-NA metalens. Here, we demonstrate that a high NA (0.97) metalens design approach can simultaneously provide sub-diffraction focusing for oblique incidence and broadband operation. Simulation results demonstrate that the metalens with an aperture stop, R (stop), of 7 & mu;m have the operating angle range of [-15 & DEG;, +15 & DEG;] for sub-wavelength focusing. For the case of R (stop) = 9 & mu;m, sub-diffraction focusing is realized in the oblique angle range at & PLUSMN;6 & DEG;. Significantly, the metalens is able to realize a sub-diffraction focusing over the wavelength range 600-750 nm. These types of metalens have the important advantages of sub-diffraction focusing and broadband operation. They are also ultra-thin and easy to integrate, allowing such metalens could be used in miniaturized and integrated optical systems.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available