Femtosecond surface plasmon pulse propagation with the balance between group velocity dispersion and loss dispersion in a superlattice

Due to strong dispersion of metal, the short pulse will broaden inevitably when it propagates in surface plasmon polariton (SPP) waveguide. In order to overcome this problem, we analyze effect of loss dispersion near loss peak and valley on pulse width. SPP superlattice is proposed to realize balance between the GVD and loss dispersion. The GVD and loss dispersion are determined by structure parameters of superlattice. Therefore, the balance between GVD and loss dispersion can be realized for pulse with center wavelength of 1550 nm by altering structure parameters. The width of output pulse will not alter after it travels through the superlattice. This structure offers another way to realize pulse width unchanged by balance between GVD and loss dispersion for femtosecond pulse at given center wavelength.