Coherent manipulation of birefringent superluminal bright solitons in a chiral medium

Abstract

The superluminal solitonic propagation behavior of left- and right-circularly polarized (LCP/RCP) light beams is investigated in a chiral medium. RCP and LCP beam absorption exhibits super-Gaussian-type peak behavior with spatial coordinate fluctuation around the origin. The RCP beam’s subluminal phase velocity is $v_p^{(+)}=c/n_r^{(+)}$ , and its refractive index is 5.47. On the other hand, the LCP beam’s superluminal phase velocity is $v_p^{(-)}=c/n_r^{(-)}$ , and its refractive index is −3.65. Both LCP and RCP beams propagate at superluminal group speeds in the medium. The RCP and LCP beams’ maximum group index values are determined to be $N_g^{(+)}=-33522$ and $N_g^{(-)}=-1305$ . The group velocities that correspond to this are $v_g^{(+)}=-c/33522$ and $v_g^{(-)}=-c/1305$ . With the position of greater nonlinearity and periodicity changing with forward time flowing, the RCP and LCP pulses E(r,t)⁽⁺⁾ and E(r,t)⁽⁻⁾ exhibit superluminal-peaked soliton characteristics. With increasing forward time, the LCP pulse intensity shifts to a positive position while the RCP pulse intensity shifts to a negative position. The bright superluminal solitonic intensities are modified and controlled. For both polarized light beams in a chiral atomic medium. The obtained results may be useful for soliton radar technology and time cloak equipment to reduce information hacking from outside hackers.