Polarization-insensitive narrowband reflective wavefront manipulation through all-dielectric anisotropic subwavelength structures
Meiyan Pan,
Yanxin Lu,
Jintao Wang,
Yihang Chen
Affiliations
Meiyan Pan
Ji Hua Laboratory, Foshan 528200, China; Corresponding author
Yanxin Lu
Key Laboratory of Atomic and Subatomic Structure and Quantum Control (Ministry of Education), Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, School of Physics, South China Normal University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, South China Normal University, Guangzhou 510006, China
Jintao Wang
Key Laboratory of Atomic and Subatomic Structure and Quantum Control (Ministry of Education), Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, School of Physics, South China Normal University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, South China Normal University, Guangzhou 510006, China
Yihang Chen
Key Laboratory of Atomic and Subatomic Structure and Quantum Control (Ministry of Education), Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, School of Physics, South China Normal University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, South China Normal University, Guangzhou 510006, China; Corresponding author
Summary: Local metasurfaces provide high flexibility in shaping wavefronts but suffer from poor frequency selectivity. Here, we numerically present a reflective all-dielectric metasurface platform achieving simultaneous local phase control and spectral filtering: it reshapes the wavefront at a specific wavelength while spatially separating it from other wavelengths without requiring additional optics. The highly efficient phase control is inherently linked to the high polarization conversion ratio (PCR), ensured by a silicon nanoblock as a narrowband reflective half-wave plate through fundamental Mie resonances. The meta-atom exhibits near-unity peak reflection, a PCR reaching 0.97, and a quality factor around 20. By adjusting rotation angles, we disrupt the geometric phase conjugation, enabling polarization-insensitive applications, for example, a metalens with a high relative focusing efficiency (0.7) across the narrowband reflective spectrum. Our design exhibits high robustness against variations in the angle of incidence (up to 28°) and fabrication inaccuracies, allowing its implementation in various meta-applications.
