Ultrathin and high-efficiency Pancharatnam-Berry phase metalens for millimeter waves
Moreno-Peñarrubia A. Teniente J. Kuznetsov S. Orazbayev B. Beruete M.
31 May 2021American Institute of Physics Inc.
Applied Physics Letters
2021#118Issue 22
Applying the Pancharatnam-Berry (PB) principle to half-wave plate (HWP) metasurfaces allows the manipulation of wavefronts along with the conversion of the handedness of circularly polarized incident waves by simply rotating the meta-atoms that compose the metasurface. PB metasurfaces (PBM) working in transmission mode with four or more layers have been demonstrated to reach levels of transmission efficiency near 100% but also have resulted in bulky structures. On the other hand, compact tri-layer ultrathin (λ/8) designs have reached levels near 90% but are more challenging than single- or bi-layer structures from a manufacturing viewpoint. Here, we propose a compact ultrathin (<λ/13) transmissive PBM with only two layers (which significantly simplifies the fabrication process) achieving a transmission efficiency level of around 90%, focusing the wavefront of a circularly polarized incident wave and converting its handedness. The metasurface is composed of identical bi-layered H-shaped unit cells (meta-atoms) whose transmission phases are chosen by introducing different rotation angles to each unit cell according to a lens spatial phase profile. The structure is analytically and numerically studied and experimentally measured, verifying an excellent behavior as an HWP PB metalens at 87 GHz.
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Antennas Group - TERALAB, Universidad Pública de Navarra, Pamplona, Navarra, 31006, Spain
Institute of Smart Cities (ISC), Public University of Navarre, Campus de Arrosadia, Pamplona, Navarra, 31006, Spain
Rzhanov Institute of Semiconductor Physics SB RAS, Novosibirsk Branch “TDIAM ,â€, Novosibirsk, 630090, Russian Federation
Analytical and Technological Research Center, Novosibirsk State University, Novosibirsk, 630090, Russian Federation
Department of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-sultan, 010000, Kazakhstan
Antennas Group - TERALAB
Institute of Smart Cities (ISC)
Rzhanov Institute of Semiconductor Physics SB RAS
Analytical and Technological Research Center
Department of Physics
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