Spin-momentum locked modes on anti-phase boundaries in photonic crystals.
Opt Express
; 28(2): 2070-2078, 2020 Jan 20.
Article
en En
| MEDLINE
| ID: mdl-32121905
ABSTRACT
An anti-phase boundary is formed by shifting a portion of photonic crystal lattice along the direction of periodicity. A spinning magnetic dipole is applied to excite edge modes on the anti-phase boundary. We show the unidirectional propagation of the edge modes which is also known as spin-momentum locking. Band inversion of the edge modes is discovered when we sweep the geometrical parameters, which leads to a change in the propagation direction. Also, an optimized source is applied to excite the unidirectional edge mode with high directivity.
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