Orbital Angular Momentum Generating Thin-Film Conformal Metasurface for Backscattering Control
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866914023924039680 |
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| author | Meleshin, Yury M. Azarov, Maxim V. Airapetian, Artem A. Lyalin, Konstantin S. |
| author_facet | Meleshin, Yury M. Azarov, Maxim V. Airapetian, Artem A. Lyalin, Konstantin S. |
| contents | This paper presents the design, simulation, and experimental verification of a flexible thin-film conformal metasurface for backscattering control via orbital angular momentum (OAM) wave generation in the X-band (9.5-10.5 GHz). The metasurface comprises asymmetric square loop meta-atoms fabricated on an air-equivalent dielectric substrate with subwavelength thickness (lambda/15 at 10 GHz). Analytical modeling define the phase difference requirement (arg(ryy) - arg(rxx) = 180 +- 25 deg for spin-to-orbital angular momentum conversion, enabling OAM mode l = +1 generation upon circularly polarized wave reflection. Full-wave EM simulations and antenna array theory predictions confirmed a characteristic radiation pattern null along the OAM propagation axis. Experimental prototypes were fabricated using adhesive-backed foil on foam-core substrates, demonstrating: 4 dB reflected power reduction for the OAM-generating metasurface compared to a uniform-phase reference, 7 dB reflected waves reduction versus solid metal including for various radii of rounding surfaces. The measured suppression bandwidth reached 1 GHz, though alignment sensitivity due to the narrow null zone was identified as a limitation. Additional radial phase gradients for beam defocusing reduced performance by 1-2 dB due to main lobe distortion. Discrepancies between analytical models and measurements underscored the importance of mutual coupling effects in complex phase distributions. This work confirms thin-film conformal metasurfaces as a viable solution for controllable backscattering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_04953 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Orbital Angular Momentum Generating Thin-Film Conformal Metasurface for Backscattering Control Meleshin, Yury M. Azarov, Maxim V. Airapetian, Artem A. Lyalin, Konstantin S. Applied Physics This paper presents the design, simulation, and experimental verification of a flexible thin-film conformal metasurface for backscattering control via orbital angular momentum (OAM) wave generation in the X-band (9.5-10.5 GHz). The metasurface comprises asymmetric square loop meta-atoms fabricated on an air-equivalent dielectric substrate with subwavelength thickness (lambda/15 at 10 GHz). Analytical modeling define the phase difference requirement (arg(ryy) - arg(rxx) = 180 +- 25 deg for spin-to-orbital angular momentum conversion, enabling OAM mode l = +1 generation upon circularly polarized wave reflection. Full-wave EM simulations and antenna array theory predictions confirmed a characteristic radiation pattern null along the OAM propagation axis. Experimental prototypes were fabricated using adhesive-backed foil on foam-core substrates, demonstrating: 4 dB reflected power reduction for the OAM-generating metasurface compared to a uniform-phase reference, 7 dB reflected waves reduction versus solid metal including for various radii of rounding surfaces. The measured suppression bandwidth reached 1 GHz, though alignment sensitivity due to the narrow null zone was identified as a limitation. Additional radial phase gradients for beam defocusing reduced performance by 1-2 dB due to main lobe distortion. Discrepancies between analytical models and measurements underscored the importance of mutual coupling effects in complex phase distributions. This work confirms thin-film conformal metasurfaces as a viable solution for controllable backscattering. |
| title | Orbital Angular Momentum Generating Thin-Film Conformal Metasurface for Backscattering Control |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2509.04953 |