Polarization-Orthogonal Nondegenerate Plasmonic Higher-Order Topological States
Polarization-Orthogonal Nondegenerate Plasmonic Higher-Order Topological States
Photonic topological states, providing light-manipulation approaches in robust manners, have attracted intense attention. Connecting photonic topological states with far-field degrees of freedom (d.o.f.) has given rise to fruitful phenomena. Recently emerged higher-order topological insulators (HOTIs), hosting boundary states two or more dimensions lower than those of bulk, offer new paradigms …