Fig. 1
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Wave contained in a volume dV before and after interaction with the SRR in a waveguide. According to the law of conservation of angular momentum, the AM carried by the incident wave dℳi has been transferred to the SRR, exerting a torque Γ for a time dt. Dashed arrows indicate wave propagation direction. 1, 2, A and B: matched antennas; SS: Spider Silk; C: Camera.
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