Control of light in a quantized four level graphene atomic system via self and cross-Kerr nonlinearity

Publication date: Available online 23 September 2019Source: Physics Letters AAuthor(s): Usman Khan, Bakht Amin, Arif Ullah, Kefayat UllahAbstractWe investigate self and cross-Kerr nonlinearity in a four level quantized graphene atomic medium. The absorption, dispersion, transmission and subluminal/superluminal behaviors of a probe light field are studied. An amplification of the probe light field is observed in the absorption spectrum. The normal and anomalous slope of dispersion is also investigated at the positive/negative absorption region. It is shown that Kerr nonlinearity invert and enhance the subluminal/superluminal behaviors of the pulse and self-Kerr effect is found to be more subluminal/superluminal as compared to cross-Kerr effect. The results show significant applications in information storage, self and cross phase modulation and lasing without inversion.

Source: Physics Letters A - September 24, 2019 Category: Physics Source Type: research