Broadband terahertz polarization converter with anomalous reflection based on phase gradient metasurface

Yin, Bo; Ma, Yue

doi:10.1016/j.optcom.2021.126996

Cited by 15 publications

(4 citation statements)

References 24 publications

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“…Metasurfaces employing sub-wavelength resonant structures are widely being used for polarization control purposes. In the literature, metasurface polarization converters have been designed based on transmissive mode [10], [11], [12], [13], [14], transmissive and reflective mode [15] and reflective modes [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28]. The transmissive type polarization converters suffer due to narrow bandwidth [13], [14] or require multilayer topologies to provide wideband operation [11].…”

Section: Introductionmentioning

confidence: 99%

“…However, because of the highly resonant characteristics of the split-ring, the polarization conversion ratio (PCR) is limited to only 80% in these works. In [19], [20], an array of H-shaped unit cell structures are introduced for reflecting phases, resulting in cross-polarization conversion bandwidth of 0.2 THz and 0.3 THz, respectively. The PCR of these reported works are ≥ 85%.…”

Section: Introductionmentioning

confidence: 99%

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Wideband and Tunable Reflective Cross-Polarization Conversion Metasurface for TeraHertz Applications

Nagini

2022

IEEE Photonics J.

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An ultrathin and wideband reflective crosspolarization converter is presented in this paper. The design consists of a pair of modified dumbbell shaped resonators which are connected together with a conductive strip. The proposed single-layer THz metasurface achieved a high polarization conversion ratio (PCR) of ≥95% in the operating frequency ranging from 1.76-4.26 THz. This wide-bandwidth cross-polarization conversion is obtained by exciting multiple closely spaced resonant frequencies at 1.98 THz, 2.61 THz, 2.95 THz, and 3.93 THz. The working mechanism of the proposed structure is analyzed and the polarizer exhibits an excellent angular stability upto 40 0 of incidence. Further, the proposed cross-polarizer exhibits continuous tunability of PCR over the operating frequencies when photoconductive silicon (Si) is filled in the gap between pair of dumbbell-resonators. The wideband characteristics and the switchable property show that the proposed reflective cross polarizer is an excellent candidate for manipulation and control of polarization in THz communication systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wideband and Tunable Reflective Cross-Polarization Conversion Metasurface for TeraHertz Applications

Nagini

2022

IEEE Photonics J.

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“…A reflective silicon metasurface has been studied as a QWP with a relative operating bandwidth of 49% 17 . A reflective metal metasurface composed of phase gradient resonators converts linearly polarized light into circularly polarized light from 0.4 to 0.6 THz 18 . However, transmission mode operation is more favorable for most of the applications.…”

Section: Introductionmentioning

confidence: 99%

Terahertz wideband quarter wave plate based on freestanding grating structures

et al. 2022

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Wideband metasurfaces usually have increased structure complexity as compared to their narrowband counterparts, by integrating multiple in-plane or cascaded resonant structures. We propose a dielectric grating structure as a quarter-wave plate with alleviated structure complexity and wide bandwidth at terahertz frequencies, by simply enlarging the period from subwavelength to superwavelength scale. From the modal theory, the superwavelength grating supports more than one waveguide modes. The superposition of the fundamental mode and higher-order mode with diverse dispersion characteristics is used to engineer the spectral response and to achieve a wideband linear-to-circular polarization conversion, which is validated by experimental study.

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“…Broadband and simultaneous linear and circular polarization conversion can be realized by changing the super surface volume. In [24], a broadband polarization converter with anomalous reflection in terahertz band is proposed. From 0.40 to 0.60 THz, the variation range of reflection angle is 39 • to 20 • , and the side lobe level is less than −14 dB.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Off-Axis Focus Polarization Converter Based on Metasurface

Yin¹,

Zhu²,

Ma³

2021

PIER Letters

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In order to satisfy the requirements of terahertz time-domain spectrum system under specific circumstances, an off-axis focus reflective polarization converter in terahertz band is proposed. By combining the principle of phase compensation and phase gradient metasurface, a reflective array containing 20 × 20 units is designed. The phase distribution along the metasurface is calculated through the principle of optical path reversibility. Geometric rotation and resonant frequency modulation constitute the phase change of the unit that can overlap one another without interference. Compared with the conventional reflective polarization converter in terahertz band, the proposed one could reflect the normally incident terahertz wave while providing larger energy at the focus. The simulation results show that the proposed polarization converter has good performance in both polarization conversion and electromagnetic focus, which has significant practical application in numerous situations.

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Broadband terahertz polarization converter with anomalous reflection based on phase gradient metasurface

Cited by 15 publications

References 24 publications

Wideband and Tunable Reflective Cross-Polarization Conversion Metasurface for TeraHertz Applications

Wideband and Tunable Reflective Cross-Polarization Conversion Metasurface for TeraHertz Applications

Terahertz wideband quarter wave plate based on freestanding grating structures

Terahertz Off-Axis Focus Polarization Converter Based on Metasurface

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