Journal
PHYSICAL REVIEW B
Volume 99, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.180101
Keywords
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Funding
- 973 Program
- China National Key Basic Research Program [2015CB659400, 2016YFA0301100, 2016YFA0302000, 2018YFA0306201]
- National Science Foundation of China [11774063, 11727811, 91750102, 11604355]
- Science and Technology Commission of Shanghai Municipality [17ZR1442300, 17142200100]
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In the momentum space of two-dimensional (2D) periodic photonic systems, the polarization states of radiating Bloch modes on a single band can form vortex polarization singularities. Here, we study vortex polarization singularities at the band degeneracies. We design a quadratic degeneracy in a plasmonic crystal with C-4v symmetry which, by symmetry breaking, splits into a pair of Dirac points with half vortices. The integer vortex singularity at the quadratic degeneracy and the half one at the Dirac degeneracy are measured using polarization-resolved momentum-space imaging spectroscopy. The complete evolution of the splitting from the integer vortex to a pair of half vortices is observed in experiments.
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