Spatial separation of azimuthally and radially polarized beams from non-polarized light waves based on the electrically controlled birefringence effect

Chen, Mingce; Li, Zhexun; Liu, Taige; Wang, Zhe; Chen, Zhaomin; Liu, Kewei; Hu, Cong; Ye, Mao; Zhang, Xinyu

doi:10.1364/ol.449318

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…By enabling polarizers to enhance beam focusing, generate vortex beams, and power electromagnetic clocks, the ability to shape EM-wave polarization opens up a world of possibilities 1 – 4 . Traditional techniques for controlling electromagnetic polarization, such as the Faraday effect 5 and birefringent crystals 6 , have long been at the forefront of this field of research. Despite their significance, these methods face several practical challenges, such as restricted bandwidth, large and cumbersome equipment, and difficulties in integration into modern systems.…”

Section: Introductionmentioning

confidence: 99%

Design, optimization, and comparative analysis of wide-band polarization conversion along with dual coding sequences for RCS reduction

Ahmad,

Choi

2024

Sci Rep

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In this paper, a wideband polarization conversion metasurface is designed. Additionally, coding and chessboard metasurfaces are specifically tailored for radar cross-section reduction (RCS). Initially, a compact unit cell demonstrating exceptional polarization conversion performance is introduced, achieving a polarization conversion ratio (PCR) exceeding 90$$\%$$ % across frequencies ranging from 7.9 to 22.7 GHz. The PCR remains effective even when oblique incidence angles of up to 30$$^\circ$$ ∘ are utilized across this frequency band. Roger RT5880, with a thickness of 0.254 mm, serves as the substrate. An airgap is introduced between the substrate and the ground plane to enhance the polarization conversion bandwidth. This unit cell serves as the fundamental building block for subsequent metasurface configurations. To assess the scalability and effectiveness, a 36 $$\times$$ × 36 unit array is assembled, confirming efficient polarization conversion capabilities extending to larger structures. Moreover, a 1-bit coding unit “0” and “1” are formed by the Pancharatnam-Berry phase based on the same-sized meta-atom with 90$$^\circ$$ ∘ orientations. The robustness and practicality of the design are demonstrated by creating 12 $$\times$$ × 12 lattices and evaluating their RCS reduction potential under two distinct scenarios: a chessboard pattern and a coding-based scheme. Notably, its results indicate substantial RCS reduction across a broad frequency spectrum (7.9 to 22.7 GHz) for both configurations. This study demonstrates the wide-ranging applicability of metasurface design, making it a valuable contribution to the fields of microwave engineering, polarization control, and radar stealth technology. Owing to its simplicity, bandwidth, and versatility, this approach offers innovative solutions for diverse real-world applications.

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Section: Introductionmentioning

confidence: 99%

Design, optimization, and comparative analysis of wide-band polarization conversion along with dual coding sequences for RCS reduction

Ahmad,

Choi

2024

Sci Rep

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Advances in the preparation and application of liquid crystal microcapsules

Wang,

Liu,

Luo

et al. 2024

Liquid Crystals

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Orthogonal separation of arbitrary vector beams from non-polarized light waves based on a patterned liquid-crystal photo-alignment

Chen¹,

Ye²,

Wang³

et al. 2022

Opt. Lett.

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An effective method for orthogonally separating arbitrary vector polarized beams from non-polarized incident light waves is proposed in this Letter. A tunable patterned spatial distribution of liquid-crystal (LC) molecules can be effectively constructed based on both the initial photo-alignment and the electrically controlled birefringence of nematic LC materials. The LC photo-alignment over a smooth surface without any common nano-grooves leads to a highly efficient light-wave transformation by inducing a desired initial arrangement of LC directors and then acquiring extraordinary light waves with the needed, or even arbitrary, spatial polarization. The vector polarized beams can be highly converged according to a microhole-patterned electrode and a gradient refractive index distribution of the LC layer, which is driven and adjusted by an applied signal voltage. Due to the intrinsic polarization sensitivity of nematic LC materials, the formed gradient refractive index appearance only corresponds to extraordinary light waves. The proposed approach provides a way to achieve the orthogonal separation of arbitrary vector beams from non-polarized light waves. Moreover, it can be further utilized to generate and obtain arbitrary vector beams, as well as to perform adaptive light-beam convergence or even the focusing of arbitrary vector beams, which is expected to advance the development of vector beam generation and manipulation, thereby stimulating potential applications.

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Spatial separation of azimuthally and radially polarized beams from non-polarized light waves based on the electrically controlled birefringence effect

Cited by 3 publications

References 34 publications

Design, optimization, and comparative analysis of wide-band polarization conversion along with dual coding sequences for RCS reduction

Design, optimization, and comparative analysis of wide-band polarization conversion along with dual coding sequences for RCS reduction

Advances in the preparation and application of liquid crystal microcapsules

Orthogonal separation of arbitrary vector beams from non-polarized light waves based on a patterned liquid-crystal photo-alignment

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