Localization of light in induced triangular photonic lattices with defects

In this paper, the electromagnetically induced lattice with defect is proposed with the destructive quantum interference. The ensemble of the four-level N type cold atoms is considered to follow the spatial modulation where the strong control field is employed with the spatial light modulator (SLM). Due to the flexible controllability, the variable positions of the defect, as well as the localization of the signal field can be realized and effectively manipulated. Additionally, the propagation properties of signal light in multi-defects are also discussed in this work.