High-efficiency multi-wavelength metasurface with complete independent phase control

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2018,（5）
• 页码范围: 7-11
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL201816.050003

摘要

As a consequence of Kramers–Kronig relations, the wavelength-dependent behavior of the metasurface is one of the critical limitations in existing metasurface structures, which reduces the design freedom among different wavelengths. Here, we present an approach to construct a high-efficiency multi-wavelength metasurface with independent phase control by coding different wavelengths into orthogonal polarizations. As proof of the con-cept, two dual-band metasurfaces have been proposed and numerically demonstrated by multiple vortex beam generation in near-field and polarization multiplexing achromatic beam deflection. Furthermore, simulated re-sults show that the proposed metasurface exhibits high transmission efficiency at both wavelengths, which may find widespread applications in subwavelength electromagnetics.