TY - JOUR

T1 - Ultrathin Subterahertz Half-Wave Plate With High Conversion Efficiency Based on Zigzag Metasurface

AU - Moreno-Penarrubia, Alexia

AU - Kuznetsov, Sergei A.

AU - Beruete, Miguel

N1 - Funding Information: Manuscript received September 13, 2019; revised April 17, 2020; accepted April 23, 2020. Date of publication May 14, 2020; date of current version October 29, 2020. This work was supported by the Spanish Ministerio de Ciencia, Innovación y Universidades under Project RTI2018-094475- B-I00 (MCIU/AEI/FEDER, UE). The work of Alexia Moreno-Peñarrubia was supported by the Universidad Pública de Navarra (UPNA) through the Formación de Personal Investigador (FPI) Ph.D. Grant Program. The work of Sergei A. Kuznetsov was supported in part by the Ministry of Science and Higher Education of the Russian Federation under Project FSUS-2020- 0029 and in part the Russian Foundation for Basic Research under Project 18-29-20066. (Corresponding author: Miguel Beruete.) Alexia Moreno-Peñarrubia is with the Antennas Group-TERALAB, Universidad Pública de Navarra, 31006 Pamplona, Spain (e-mail: alexia.moreno@unavarra.es). Sergei A. Kuznetsov is with the Analytical and Technological Research Center HT&NM, Physics Department, Novosibirsk State University, 630090 Novosibirsk, Russia, and also with the Rzhanov Institute of Semicon- ductor Physics SB RAS, Novosibirsk Branch “TDIAM,” 630090 Novosibirsk, Russia (e-mail: sakuznetsov@nsu.ru). Miguel Beruete is with the Antennas Group-TERALAB, Universidad Pública de Navarra, 31006 Pamplona, Spain, and also with the Institute of Smart Cities (ISC), Universidad Pública de Navarra, 31006 Pamplona, Spain (e-mail:miguel.beruete@unavarra.es). II. DESIGN, SIMULATION, AND EXPERIMENTAL RESULTS Publisher Copyright: © 2020 IEEE. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2020/11

Y1 - 2020/11

N2 - In this communication, an ultrathin transmissive half-wave plate (HWP) based on a bi-layered zigzag metasurface operating at the lower frequency edge of the terahertz (THz) spectrum is numerically and experimentally studied. The thickness of HWP is only 100 μm and less than λ/20 at the operation frequency, and it achieves an amplitude transmission efficiency over 90% and a cross-polarization discrimination around 30 dB within a fractional bandwidth near 9%. A detailed analysis of the device robustness with respect to layer misalignments is carried out by designing and fabricating two additional devices with the maximum possible shift between layers along both transverse directions. The results show that the device is extremely robust relative to a misalignment along x and exhibits a frequency shift with misalignments along y, while maintaining in all cases an excellent performance as a HWP. The communication ends with a final study to ascertain a physical mechanism that explains the robustness of the device in regard to misalignments. These results complement and extend the reach of metasurfaces in the emerging THz band.

AB - In this communication, an ultrathin transmissive half-wave plate (HWP) based on a bi-layered zigzag metasurface operating at the lower frequency edge of the terahertz (THz) spectrum is numerically and experimentally studied. The thickness of HWP is only 100 μm and less than λ/20 at the operation frequency, and it achieves an amplitude transmission efficiency over 90% and a cross-polarization discrimination around 30 dB within a fractional bandwidth near 9%. A detailed analysis of the device robustness with respect to layer misalignments is carried out by designing and fabricating two additional devices with the maximum possible shift between layers along both transverse directions. The results show that the device is extremely robust relative to a misalignment along x and exhibits a frequency shift with misalignments along y, while maintaining in all cases an excellent performance as a HWP. The communication ends with a final study to ascertain a physical mechanism that explains the robustness of the device in regard to misalignments. These results complement and extend the reach of metasurfaces in the emerging THz band.

KW - Circular polarization

KW - electromagnetic radiation

KW - half-wave plate (HWP)

KW - metasurfaces

KW - polarizer

KW - terahertz (THz) radiation

KW - QUARTER-WAVE

KW - BROAD-BAND

KW - TERAHERTZ

KW - Electromagnetic radiation

KW - Terahertz (THz) radiation

KW - Half-wave plate (HWP)

KW - Polarizer

KW - Metasurfaces

UR - http://www.scopus.com/inward/record.url?scp=85104071773&partnerID=8YFLogxK

U2 - 10.1109/TAP.2020.2993308

DO - 10.1109/TAP.2020.2993308

M3 - Article

VL - 68

SP - 7700

EP - 7704

JO - IEEE Transactions on Antennas and Propagation

JF - IEEE Transactions on Antennas and Propagation

SN - 0018-926X

IS - 11

M1 - 9094018

ER -