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Title: Dual-wavelength polarization-dependent bifocal metalens for achromatic optical imaging based on holographic principle
Authors: Qu, J 
Luo, H 
Yu, C 
Issue Date: Mar-2022
Source: Sensors, Mar. 2022, v. 22, no. 5, 1889
Abstract: Recently, ultrathin metalenses have attracted dramatically growing interest in optical imaging systems due to the flexible control of light at the nanoscale. In this paper, we propose a dual-wavelength achromatic metalens that will generate one or two foci according to the polarization of the incident. Based on geometric phase modulation, two unit cells are attentively selected for efficient operation at distinct wavelengths. By patterning them to two divided sections of the metalens structure plane, the dual-wavelength achromatic focusing effect with the same focal length is realized. In addition, the holographic concept is adopted for polarization-dependent bifocal generation, in which the objective wave is originated from two foci that are respectively formed by two orthogonal polarization states of circularly polarized light, namely Left-handed circularly polarized (LCP) light and Right-handed circularly polarized (RCP) light. The incident light is considered as the reference light. The achromatic focusing and polarization-dependent bifocusing are numerically verified through simulations. The proposed design opens the path for the combination of multi-wavelength imaging and chiral imaging, which may find potential applications, such as achromatic optical devices and polarization-controlled biomedical molecular imaging systems.
Keywords: Achromatic optical imaging
Bifocal metalens
Dual-wavelength focusing
Holographic principle
Polarization-dependent
Publisher: Molecular Diversity Preservation International (MDPI)
Journal: Sensors 
EISSN: 1424-8220
DOI: 10.3390/s22051889
Rights: Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/4.0/).
The following publication Qu, J.; Luo, H.; Yu, C. Dual-Wavelength PolarizationDependent Bifocal Metalens for Achromatic Optical Imaging Based on Holographic Principle. Sensors 2022, 22, 1889 is available at https://doi.org/10.3390/s22051889.
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