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(Color online) Spatial coordinate transformation for the square-shaped cloak based on the nonreciprocal gyrotropic photonic crystal (a) original space and (b) transformed space.
(Color online) (a) Band structure of TM mode of the designed semi-cylindrical YIG PC. The solid and dot lines represent two sets of opposite high-symmetry directions, respectively, as shown in the inset. (b) Electric field distribution at the frequency of 0.31 in pass band. (c) Electric field distribution at frequency of 0.22 in band gap.
(Color online) (a) EFSs in the sixth band of NRPC, where the white and black circles correspond to the frequency of 0.51 in NRPC and in air, respectively. A pair of counter incidences are indicated by +30° and −30° arrows, respectively. Group velocity and phase velocity are indicated by Vg and Vp , respectively. The corresponding electric filed distributions of the counter incident EM waves are shown in (b) +30° and (c) −30°. (d) and (e) show the PT symmetric cases of (b) and (c), respectively.
(Color online) (a) EFSs in the fifth band at the frequency of 0.48. The corresponding electric filed distributions are shown in (b) +30° and (c) −30°. (d) and (e) show the PT symmetric cases of (b) and (c), respectively.
(Color online) Parallelogram-shape transformed cloak at two different frequencies: (a) 0.51 and (b) 0.48.
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