Fig. 5
Robust topological cavity mode on a dislocation. a Experimental setup: the photonic crystal with a dislocation is cladded above and below by aluminum plates and mounted onto a 2D mapping system. b Bulk and cavity modes from simulation for PBG I (left) and PBG II (right). There is only one cavity mode in PBG II, whereas no cavity mode in PBG I. c–f Transmission and field profiles (upper insets: simulation, lower insets: experiments). The left insets show the structure near the dislocation: the gray points represent the YIG pillars and the green points denote metallic pillars. The upper arrows indicate electromagnetic wave injection at the cyan asterisk point, while the lower arrows indicate electromagnetic wave detection at the purple asterisk point in transmission measurements
