11 November 2014 Orbit angular momentum encoding at 0.3 THz via 3D printed spiral phase plates
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Abstract
Terahertz wave carrying OAM would boost the capacity of free-space communication with a high carrier frequency and additional degrees of freedom. In this work, we present a experimental demonstration of THz orbital angular momentum (OAM) encoding via 3D printed spiral phase plates(SPPs). By using four “coding” spps with toplogical values -2, - 1,+1,+2, we can encode OAM information onto THz waves and generate temporal varying OAM states with controlled sequences (i.e., 2-bit coding). By using interference between OAM beam and a reference gaussian beam, the OAM information can be detected from the interference fork pattern.
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Xuli Wei, Xuli Wei, Changming Liu, Changming Liu, Zhongqi Zhang, Zhongqi Zhang, Long Zhu, Long Zhu, Jian Wang, Jian Wang, Kejia Wang, Kejia Wang, Zhenggang Yang, Zhenggang Yang, Jinsong Liu, Jinsong Liu, } "Orbit angular momentum encoding at 0.3 THz via 3D printed spiral phase plates", Proc. SPIE 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III, 92751P (11 November 2014); doi: 10.1117/12.2085083; https://doi.org/10.1117/12.2085083
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