TY - JOUR
T1 - Alleviating Orbital-Angular-Momentum-Mode Dispersion Using a Reflective Metasurface
AU - Jiang, Shan
AU - Chen, Chang
AU - Ding, Jun
AU - Zhang, Hualiang
AU - Chen, Weidong
N1 - Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/5
Y1 - 2020/5
N2 - Electromagnetic waves carrying orbital angular momentum (OAM) have attracted much interest due to their capacity to enhance communication capabilities. In this work, the OAM-mode-dispersion (OMD) phenomenon is analyzed by decomposing the vortex wave into a series of plane waves based on the spectral-domain method. Specifically, the OMD phenomenon induced by off-axis transmission is analyzed in detail, which clearly demonstrates that the vortex wave with a single OAM mode is spread to multiple OAM modes after off-axis propagation. To avoid the performance degradation of the OAM system due to OMD (e.g., interchannel crosstalk and signal-to-noise ratio reduction), a method for alleviating the OMD based on the reflective metasurface is proposed to transmit or receive the vortex waves with multiple OAM modes. Theoretical formulas for the phase distribution are developed in order to construct the metasurface. As proof-of-concept demonstrations, two metasurface prototypes are designed, fabricated, and measured to verify the proposed method in the radio-frequency range. The experimental results agree very well with the full-wave simulation results, validating the design methodology.
AB - Electromagnetic waves carrying orbital angular momentum (OAM) have attracted much interest due to their capacity to enhance communication capabilities. In this work, the OAM-mode-dispersion (OMD) phenomenon is analyzed by decomposing the vortex wave into a series of plane waves based on the spectral-domain method. Specifically, the OMD phenomenon induced by off-axis transmission is analyzed in detail, which clearly demonstrates that the vortex wave with a single OAM mode is spread to multiple OAM modes after off-axis propagation. To avoid the performance degradation of the OAM system due to OMD (e.g., interchannel crosstalk and signal-to-noise ratio reduction), a method for alleviating the OMD based on the reflective metasurface is proposed to transmit or receive the vortex waves with multiple OAM modes. Theoretical formulas for the phase distribution are developed in order to construct the metasurface. As proof-of-concept demonstrations, two metasurface prototypes are designed, fabricated, and measured to verify the proposed method in the radio-frequency range. The experimental results agree very well with the full-wave simulation results, validating the design methodology.
UR - https://www.scopus.com/pages/publications/85085843637
U2 - 10.1103/PhysRevApplied.13.054037
DO - 10.1103/PhysRevApplied.13.054037
M3 - 文章
AN - SCOPUS:85085843637
SN - 2331-7019
VL - 13
JO - Physical Review Applied
JF - Physical Review Applied
IS - 5
M1 - 054037
ER -