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9 September 2022 Design of quadrature circularly polarized two-component focusing metalens
Xing Yang, Chinhua Wang
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Proceedings Volume 12328, Second International Conference on Optics and Image Processing (ICOIP 2022); 1232803 (2022) https://doi.org/10.1117/12.2644361
Event: Second International Conference on Optics and Image Processing (ICOIP 2022), 2022, Taian, China
Abstract
Recently, metalens for circularly polarized incidence have received increasingly attentions due to their superior functionalities on the wavefront manipulation of light. However, the previous work on focusing metalens usually only deals with the single output component of incident light, that is, either the co-polarization component or the quadrature polarization component. In this paper, a reflective metalens working at 1550 nm is proposed and designed using a twodimensional nanoresonating structure of a metal elliptic-square ring. By combining the resonant phase with the geometric phase (i.e., Pancharatnam-Berry (PB) phase), the metalens is able to separate and focus two orthogonal polarized components of a circularly polarized incident light. When the orientation of the metal elliptic nanofin is opposite to the helicity of the incident light (i.e., left-handed circular polarization (LCP) or right-handed circular polarization (RCP)), two distinct focal points can be obtained can be obtained while only one focus can be obtained when the orientation of the metal elliptic nanofin matches the helicity of the incident light. The focusing spot of the metalens approaches the diffraction limit (1.22λf/D=1.2 μm). The different responses of the proposed metalens to LCP and RCP light has a broad application prospect in the polarimetric imaging and detection of chiral molecules.
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Xing Yang and Chinhua Wang "Design of quadrature circularly polarized two-component focusing metalens", Proc. SPIE 12328, Second International Conference on Optics and Image Processing (ICOIP 2022), 1232803 (9 September 2022); https://doi.org/10.1117/12.2644361
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KEYWORDS
Polarization
Metals
Finite-difference time-domain method
Phase modulation
Reflectivity
Gold
Wavefronts
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