Numerical study of propagation properties of surface plasmon polaritons in nonlinear media Rakibul Hasan Sagor, Md. Ghulam Saber and Mohammad A. Alsunaidi Eur. Phys. J. D, 70 3 (2016) 65 Published online: 24 March 2016 DOI: 10.1140/epjd/e2016-60631-x