局域表面波的研究

The Research of Localized Surface Waves

基于理论模型和数值模拟的方法,通过设定饱和参数、波导参数和传播常数的值可以在光折变晶体和线性电介质界面形成局域表面波。通过控制任意参量可以得到不同阶数的局域表面波模和局域表面波的波形。研究结果表明:传播常数越小,局域表面波在光折变晶体和线性电介质中衰减得就越慢。扩散机制是局域表面波形成的必要因素,它确保了局域表面波从界面到体内的衰减,并将光能量限制在近表面的窄层里。用分步傅里叶变换方法模拟了没有干扰的情况下的局域表面波在介质界面处的传播行为。验证局域表面波在传输过程中的稳定性。

Based on the theoretical model and the numerical simulation method,by setting the certain values of saturation parameter,propagation constant and guiding parameter the localized surface waves are formed at the interface between linear dielectric and photorefractive crystals.Through changing the value of the free parameter,we can get the localized surface modes and the waveform of the localized surface waves.Study results show that:The smaller the propagation constant,the slower the localized surface wave attenuation in the photorefractive crystals and the linear dielectric medium.The essential cause for the formation of the localized surface waves is the diffusion mechanism,which ensures attenuation from the surface to the bulk of the medium,and restricts beam energy in the narrow surface layer.We stimulated the propagation of the localized surface waves without perturbation at the medium interface using the split-step Fourier transform method.The stability of the localized surface waves in the propagation process is verified.