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Arbitrary superposition of plasmonic orbital angular momentum states with nanostructures

Xing-Qi An, Hong-Sheng Song, Xiang-Yu Zeng, Man-Na Gu, Zeng-Shun Jiang, Chang-Wei He, Gui-Yuan Liu, Chuan-Fu Cheng, and Yu-Qin Zhang

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Abstract

A kind of plasmonic nanostructure is proposed that can generate the arbitrary superposition of orbital angular momentum (OAM) states in surface plasmons (SPs), which is achieved by combining the segmented spirals with nanoslit pairs. The structures can independently modulate both the phase and amplitude of SP waves, and thus enable the superposition of two OAM states with arbitrary topological charges (TCs) as well as free control of their relative amplitudes. Superposed states distributed over the entire Bloch sphere and hybrid superposed states with different TCs were constructed and experimentally demonstrated. This work will offer more opportunities for multifunctional plasmonic devices.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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