A Method of generating orbital angular momentum based on curved Meanderline

Orbital angular momentum (OAM) is a kind of momentum which is generally carried by electromagnetic waves. Since OAM has the potential to satisfy the demand of channel capacity, it has attracted more and more attention recently. The demand of generating the OAM mode is growing rapidly. In this work, we study the OAM generated by the localized spoof surface plasmons in curved meanderline with a special excitation. As a result, an orbital angular momentum mode with the topological charge being 2 is generated, which may be further extend to higher modes and may provide a potential way for the multiplex communication and object feature detection.