  The recent development of topological photonics has revealed a variety of
intriguing phenomena such as Weyl degeneracy. However, topologically
non-trivial degeneracy with higher dimension has not been reported in
photonics. In this Letter, topologically charged photonic surface degeneracy in
a helix structure possessing two-fold screw symmetry is demonstrated.
Calculated Chern number and photonic Fermi arcs support topological phase of
the surface degeneracy. We also show that the photonic system can work in both
metamaterial and photonic crystal regime, which have an order of magnitude
different frequency range by the choice of material for the helix. This work
suggests the possibilities of unprecedented photonic topological features with
higher dimensions.
