title: Electromagnetically induced grating based on the giant Kerr nonlinearity controlled by spontaneously generated coherence.
abstract: We propose a scheme for realizing electromagnetically induced grating via the giant Kerr nonlinearity in a coherently driven four-level system with spontaneously generated coherence. In the presence of spontaneously generated coherence, Kerr nonlinearity can be enhanced with vanishing linear absorption. Thus, with a standing-wave coupling field, one can achieve a pure absorption grating, which leads the probe field to gather the zero-order direction when the detuning of the coupling field is on resonance. Moreover, we can obtain a pure phase grating, which diffracts a weak probe light into the first-order direction and the second-order direction when the detuning of the coupling field is off resonance.
authors.affiliation: Institute of Physics, Jilin Normal University, Siping, China. banuo2008@hotmail.com
authors.forename: Nuo
authors.initials: N
authors.lastname: Ba
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Xiang-Yao
authors.initials: XY
authors.lastname: Wu
authors.forename: Xiao-Jing
authors.initials: XJ
authors.lastname: Liu
authors.forename: Hai-Hua
authors.initials: HH
authors.lastname: Wang
authors.forename: Cui-Li
authors.initials: CL
authors.lastname: Cui
authors.forename: Ai-Jun
authors.initials: AJ
authors.lastname: Li