499 citations · 1.4k across the 8 of their papers we have counts for
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physics.optics2017★ 3 cited
Observing half and integer polarization vortices at band degeneracies
Ang Chen, Wenzhe Liu, Yiwen Zhang +6
Far-field polarization vortices were recently found on singlet bands in the momentum-space of two-dimensional photonic lattices, also known as the dark states and bound states in c…
physics.optics2017★ 326 cited
Observation of optical vortices in momentum space
Yiwen Zhang, Ang Chen, Wenzhe Liu +6
Vortex, the winding of a vector field in two dimensions, has its core the field singularity and its topological charge defined by the quantized winding angle of the vector field. V…