Propagation Property Of Ultrashort Pulse In Negative Refractive Media

Negative refraction media refers to the dielectric constantεand magnetic permeablilityμas well as negative. This medium rise to the concern of many people because of showing many of the characteristics which is not found in the normal media, This paper studies the impact of propagation of ultrashort pulse in negative refractive media . First, the ultrashort pulse transmission equation was derived through analyzing of the characteristics of negative refraction. Then, the method of split-step Fourier was used to investigate the property propagation of ultrashort pulse. The main research results obtained are as follows:First, programming using matlab, using symmetric split step Fourier method to prepare procedures ,and by selecting the accuracy of step verify its correctness. Analysis the results of simulation, the ultrashort pulse would be narrow in the normal dispersion if the parameter of second-order nonlinear dispersion was less than zero, and the effects of its was gradually changing with the propagation distance getting smaller and smaller, and the pulse would be width if the parameter of fake-quintic nonlinearity was less than zero, but the effects of its was smaller than second-order nonlinear dispersion, and the self-steepening value can be negative,positive which contributed to the center of the pulse that can shift between the leading edge and trailing edge.Second, based on the ultrashort pulse transmission equation, investigating the property propagation of ultrashort pulse with the higher-order dispersion in negative refractive media. The results show that in the zero dispersion, the ultrashort pulse would be wide asymmetric and had a oscillation only in the forefront of pulse.Third, the coefficient of the third-order nonlinear dispersion is derived, Studied the short distance to the impact of ultra-short pulse transmission. The results showed that in the normal dispersion, ultra-short pulse was wide asymmetric and pulse central drifted to the forefront; in zero dispersion, the degree of ultra-short pulse asymmetry broadening increased and the center of pulse which drifted to the forefront had a oscillation only in the forefront of pulse; in anomalous dispersion, ultra-short pulses was asymmetry narrow, the central of pulse drifted to the forefront too.These results provided a theoretical basis in order to further deepen their understanding of negative refraction media.