Gap solitons and symmetry breaking in parity-time symmetric microring coupled resonator optical waveguides

Abstract

The propagation properties of optical fields in linear and nonlinear parity-time symmetric microring coupled resonator optical waveguides are studied. The effects described include the existence of symmetry breaking thresholds, the propagation of gap solitons in nonlinear transmission lines and the existence of quasi stable propagation regimes outside the broken symmetry regions.

Extraordinary transmission and reflection in PT -symmetric two-segment-connected triangular optical waveguide networks with perfect and broken integer waveguide length ratios*

“…Similar to the 𝒫𝒯 -symmetric mechanical system, 𝒫𝒯 -symmetric optical systems can produce extraordinary optical features and phenomena near the spontaneous 𝒫𝒯 -symmetric breaking point. Subsequently, 𝒫𝒯 -symmetric optical systems, such as 𝒫𝒯symmetric optical lattices, [6][7][8][9][10] optical waveguides, [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] inhomogeneous nonlinear optical media, [30] and graphene, [31,32] have been widely investigated and some extraordinary optical characteristics, for instance, birefringence, [6] unidirec-tional invisibility, [8,9] ultrastrong absorption, [31] and singlemode lasing, [33,34] have been found.…”