Near-Field Focusing With Subwavelength Thickness Metalenses via Electromagnetic Susceptibility Models
Open Access
- 1 January 2021
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in Optics and Photonics Journal
- Vol. 11 (07), 197-209
- https://doi.org/10.4236/opj.2021.117014
Abstract
The design mentality of an optimal metalens model, based on the electromagnetic susceptibility, a synthesis of subwavelength-thick metasurfaces (MSs) is presented in this paper. First, based on the finite difference method of generalized sheet transition conditions, the surface susceptibility function of the MS with spatial discontinuities can be determined. Then, the paper analyzed the remaining corresponding physical field conditions for the scale of metalens. In order to adapt to the physical limitations encountered in the near-field focusing of the metalens, a standard parabolic phase design is proposed in this paper, and its upsides and downsides of the two-phase processing in different aspects are compared. Using COMSOL software with numerical simulation, it can be seen that the standard design can easily obtain high resolution in the near field, while the focusing effect is more stable when the focal length is small by the parabolic phase design.Keywords
This publication has 23 references indexed in Scilit:
- Fundamental limits of ultrathin metasurfacesScientific Reports, 2017
- Broadband Achromatic Metasurface LensesPublished by Optica Publishing Group ,2017
- Wave-front Transformation with Gradient MetasurfacesPhysical Review X, 2016
- A Homogenization Technique for Obtaining Generalized Sheet-Transition Conditions for a Metafilm Embedded in a Magnetodielectric InterfaceIEEE Transactions on Antennas and Propagation, 2016
- High efficiency near diffraction-limited mid-infrared flat lenses based on metasurface reflectarraysOptics Express, 2016
- Metalenses at visible wavelengths: Diffraction-limited focusing and subwavelength resolution imagingScience, 2016
- General Metasurface Synthesis Based on Susceptibility TensorsIEEE Transactions on Antennas and Propagation, 2015
- Efficient Light Bending with Isotropic Metamaterial Huygens’ SurfacesNano Letters, 2014
- Metamaterial Huygens’ Surfaces: Tailoring Wave Fronts with Reflectionless SheetsPhysical Review Letters, 2013
- Aberration-Free Ultrathin Flat Lenses and Axicons at Telecom Wavelengths Based on Plasmonic MetasurfacesNano Letters, 2012