Patent ID: 11962088
Assignee: ANHUI UNIVERSITY
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. The dual-mode OAM convergence metasurface preparation method according to claim 9, wherein the deriving a compensation phase of each base cell array of convergent vortex beams from free-space Helmholtz equation is conducted according to the following formula:

φ=2π(√{square root over ((x2+y2)+F2)}−F)/λ+L·arc tan(y/x)

wherein, φ denotes a compensation phase of each of the base cell arrays of convergent vortex beams, λ denotes wavelength in free space, L denotes topological charges of OAM, F denotes focal length, and x and y denote position coordinates corresponding to a coding array, respectively.