TY - GEN
T1 - An ultra-low profile metasurface for enhanced non-diffractive oam beam generation based on sparse feed array
AU - Bi, Jinyang
AU - Qin, Fan
AU - Gu, Chao
AU - Zhang, Hailin
AU - Cheng, Wenchi
PY - 2025/9/25
Y1 - 2025/9/25
N2 - This paper proposes a novel ultra-low profile transmitted metasurface to generate enhanced non-diffractive orbital angular momentum (OAM) beams, employing a sparse feed array (SFA) to create a quasi-plane wave excitation for the first time. Our simulation indicates that with uniform amplitude excitation, the non-diffraction performance of Bessel beam produced by metasurface, surpasses that of conventional single-feed excitation. Based on this principle, a 5 × 5 sparse feed array is introduced and positioned less than one wavelength from the metasurface, ensuring a quasi-uniform amplitude excitation across all units. Further, this metasurface leverages its flexible phase control capability and integrates the spatial phase, OAM phase, and axicon phase to generate an enhanced high-order Bessel beam. The simulated results confirm a successful non-diffractive Bessel beam generation carrying OAM with mode l = +2, exhibiting reduced beam divergence and higher gain. This design also offers benefits of ultra-low profile, high aperture efficiency, low structural complexity.
AB - This paper proposes a novel ultra-low profile transmitted metasurface to generate enhanced non-diffractive orbital angular momentum (OAM) beams, employing a sparse feed array (SFA) to create a quasi-plane wave excitation for the first time. Our simulation indicates that with uniform amplitude excitation, the non-diffraction performance of Bessel beam produced by metasurface, surpasses that of conventional single-feed excitation. Based on this principle, a 5 × 5 sparse feed array is introduced and positioned less than one wavelength from the metasurface, ensuring a quasi-uniform amplitude excitation across all units. Further, this metasurface leverages its flexible phase control capability and integrates the spatial phase, OAM phase, and axicon phase to generate an enhanced high-order Bessel beam. The simulated results confirm a successful non-diffractive Bessel beam generation carrying OAM with mode l = +2, exhibiting reduced beam divergence and higher gain. This design also offers benefits of ultra-low profile, high aperture efficiency, low structural complexity.
KW - high-order Bessel beam
KW - metasurface
KW - non-diffraction
KW - orbital angular momentum (OAM)
KW - sparse array
U2 - 10.1109/IWEM65640.2025.11167992
DO - 10.1109/IWEM65640.2025.11167992
M3 - Conference contribution
AN - SCOPUS:105018309218
SN - 9798331522414
T3 - IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)
SP - 426
EP - 429
BT - 2025 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition: iWEM 2025 Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2025 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, iWEM 2025
Y2 - 4 August 2025 through 6 August 2025
ER -