Crosstalk-Free Frequency-Spin Multiplexed Multifunctional Device Realized by Nested Meta-Atoms

ZHANG Ming; DONG Peng; TAO En; YANG Lin; HAN Qi; HE Yuhang; HOU Weimin; LI Kang

doi:10.11999/JEIT251202

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ZHANG Ming, DONG Peng, TAO En, YANG Lin, HAN Qi, HE Yuhang, HOU Weimin, LI Kang. Crosstalk-Free Frequency-Spin Multiplexed Multifunctional Device Realized by Nested Meta-Atoms[J]. Journal of Electronics & Information Technology. doi: 10.11999/JEIT251202

Citation:

ZHANG Ming, DONG Peng, TAO En, YANG Lin, HAN Qi, HE Yuhang, HOU Weimin, LI Kang. Crosstalk-Free Frequency-Spin Multiplexed Multifunctional Device Realized by Nested Meta-Atoms[J]. Journal of Electronics & Information Technology. doi: 10.11999/JEIT251202

Citation:

ZHANG Ming, DONG Peng, TAO En, YANG Lin, HAN Qi, HE Yuhang, HOU Weimin, LI Kang. Crosstalk-Free Frequency-Spin Multiplexed Multifunctional Device Realized by Nested Meta-Atoms[J]. Journal of Electronics & Information Technology. doi: 10.11999/JEIT251202

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Crosstalk-Free Frequency-Spin Multiplexed Multifunctional Device Realized by Nested Meta-Atoms

doi: 10.11999/JEIT251202 cstr: 32379.14.JEIT251202

ZHANG Ming¹,
DONG Peng^{1, 2},
TAO En¹,
YANG Lin¹,
HAN Qi¹,
HE Yuhang¹,
HOU Weimin^{1
,
,},
LI Kang³

1.
School of Information Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
2.
School of Physics, Nankai University, Tianjin 300071, China
3.
Faculty of Integrated Circuit, Xidian University, Xi’an 710003, China

Funds: The National Key Research and Development Program of China (2022YFB4400400), The National Natural Science Foundation of China (62105093 , 62441401), The National Key Laboratory of Basic Scientific Research for Innovation Fund (IFN20230113), The Major Science and Technology Support Project of Hebei Province (24290201Z), The Science and Technology Project of Hebei Education Department ( BJK2023036)

Received Date: 2025-11-14
Accepted Date: 2025-12-15
Rev Recd Date: 2025-12-15

Available Online: 2025-12-19

Abstract

Abstract

Objective To address high fabrication costs and signal crosstalk in existing multidimensional multiplexed metasurfaces, a crosstalk-free, frequency-spin multiplexed single-layer metasurface based on nested bi-spectral meta-atoms is proposed. Two C-shaped split-ring resonators are physically superimposed to target the Ku band (12.5 GHz) and the K band (22 GHz). This configuration enables four fully independent information channels, defined by two frequencies and two spin states, without spatial division or multilayer stacking. The objective is to demonstrate independent, high-performance vortex beam generation and holographic imaging, providing a simplified and cost-effective solution for advanced 6G communication and sensing systems. Methods A reflective metal–dielectric–metal metasurface architecture is adopted, in which each unit cell integrates an Outer C-Shaped Split-Ring Resonator (OCSRR) and an Inner C-Shaped Split-Ring Resonator (ICSRR). Parameter sweeps performed using CST Microwave Studio are used to select structures that provide high cross-polarization conversion at the target frequencies while maintaining negligible responses in non-target bands. Independent spin multiplexing is achieved through the combined use of transmission phase and geometric phase, controlled by resonator rotation. Two prototypes are fabricated using printed circuit board technology. MS1 is designed for focused vortex beam generation with topological charges l = +1, +2, +3, and +4, whereas MS2 is designed for holographic imaging of the letters “H”, “B”, “K”, and “D”. Device performance is validated by near-field scanning measurements under oblique incidence using a vector network analyzer. Results and Discussions Simulation and experimental results confirm strong frequency selectivity and effective spin decoupling enabled by the nested meta-atom design. The OCSRR and ICSRR dominate the electromagnetic responses at 12.5 GHz and 22 GHz, respectively, and exhibit linear superposition behavior with minimal crosstalk. MS1 generates four focused vortex beams with clearly separated topological charges, achieving an average mode purity of 88.25%. MS2 reconstructs four independent and well-defined holographic images with high channel isolation. The close agreement between measured and simulated results demonstrates the robustness of the device and validates the effectiveness of the crosstalk-free design strategy under practical illumination conditions. Conclusions A reliable approach for realizing crosstalk-free frequency-spin multiplexed metasurfaces using nested meta-atoms is demonstrated. Simultaneous and independent manipulation of electromagnetic waves across four channels is achieved on a single metasurface layer, substantially reducing design complexity and fabrication cost. The successful demonstration of multi-channel vortex beam generation and holographic imaging indicates strong potential for integrated multifunctional applications in next-generation wireless communication and optical systems.
- Metasurface,
- Frequency-spin multiplexing,
- Crosstalk-free,
- Bi-spectral meta-atoms

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References(35)

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