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.
© 2013 Optical Society of America
Original Manuscript: February 13, 2013
Revised Manuscript: April 16, 2013
Manuscript Accepted: May 21, 2013
Published: June 17, 2013
Nuo Ba, Lei Wang, Xiang-Yao Wu, Xiao-Jing Liu, Hai-Hua Wang, Cui-Li Cui, and Ai-Jun Li, "Electromagnetically induced grating based on the giant Kerr nonlinearity controlled by spontaneously generated coherence," Appl. Opt. 52, 4264-4272 (2013)