在金属与光折变晶体界面形成的表面波研究

Surface waves formed at the interface between a metal and a photorefractive crystal

应用质点振荡模型和数值模拟方法研究了在金属与光折变晶体界面形成表面波的条件及其能量变化.结果表明:传播常数的正负影响表面波的类型及波能量分布,当传播常数取负值时在界面处形成非局域表面波,取正值时在界面处形成振荡表面波和局域表面波,局域表面波的能量随传播常数的变大而单调递增.在一给定的物理系统中,可通过调节决定非线性效应强度的可变参量控制不同阶数局域表面波模及其传播波形.

The formation conditions and the energy variation of surface waves at the interface between a metal and a photorefractive crystal are investigated by using the particle oscillator model and numerical techniques. Our analysis indicates that the positive and negative values of the propagation constant affect the type of surface waves and the energy distribution： formation surface waves are nonlocal surface waves for negative values of the propagation constant and are oscillating surface waves and localized surface waves for positive values of the propagation constant, and the energy of localized surface waves in photorefractive medium increases monotonically with the propagation constant value increasing. In a given physical system, one can control the different orders and the waveforms of localized surface waves by regulating the variable parameter determining the strength of nonlinear effects.