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Selective excitation of optical vortex modes with specific charge numbers in band-tuned topological waveguides

Hibiki Kagami, Tomohiro Amemiya, Sho Okada, Yahui Wang, Nobuhiko Nishiyama, and Xiao Hu

Abstract

We propose a method for selectively propagating optical vortex modes with specific charge numbers in a photonic integrated circuit (PIC) by using a topological photonic system. Specifically, by performing appropriate band tuning in two photonic structures that comprise a topological waveguide, one specific electromagnetic mode at the Γ point of a band diagram can be excited. Based on theoretical analysis, we successfully propagated optical vortex modes with specific charge numbers over a wide range in the C band in the proposed topological waveguide. The proposed method could be useful in controlling optical vortex signals at the chip level in future orbital angular momentum multiplexing technologies.

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Supplementary Material (8)

NameDescription
Visualization 1       Time variation of mode distribution (Hy).
Visualization 2       Time variation of mode distribution (Hy).
Visualization 3       Time variation of mode distribution (Hy).
Visualization 4       Time variation of mode distribution (Hy).
Visualization 5       Time variation of mode distribution (Hy).
Visualization 6       Time variation of mode distribution (Hy).
Visualization 7       Time variation of mode distribution (Hy).
Visualization 8       Time variation of mode distribution (Hy).

Data availability

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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Equations (1)

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