摘要
用一维粒子模拟程序研究了激光脉冲在等离子体光栅中的传输特性.结果表明,初始等离子体密度,激光强度和频率共同影响激光脉冲在等离子体光栅中的传输.可以观察到脉冲减速和脉冲展宽效应,以及传输和定域类孤子结构的图像.等离子体光栅存在着光子带隙结构,并且在带隙附近有明显的禁带反射.当激光强度提高时,禁带向低频方向移动.在一定频率下,低密度等离子体光栅中会产生传输的类孤子结构.等离子体密度较大时,电磁场更容易被俘获在光栅中,从而产生定域的类孤子结构.
Transmission properties of laser pulse in plasma grating is studied with one - dimensional particle - in - cell simulation. The results show that the initial plasma density, laser intensity and frequency influence laser transmission in plasma grating together. Particle - in - cell simulations show effects of the pulse speed reduction, pulse stretching as well as transmitting and localized solitonlike structure in plasma grating. Plasma grating exhibits an wide photonic bandgap, near which the obvious forbidden band reflection appears. When the laser intensity is improved, forbidden band moves towards lower frequency. In certain frequencies, plasma gratings of low density can produce transmitting solitonlike structure. Increasing light intensity, the electromagnetic field tends to be captured in grating easily, forming localized solitonlike structure.
出处
《山东师范大学学报（自然科学版）》
CAS
2012年第1期67-69,72,共4页
Journal of Shandong Normal University(Natural Science)
基金
山东省自然科学基金（ZR2009AW009
国家自然科学基金（11104168）
关键词
等离子体光栅
光子带隙
类孤子结构
粒子模拟
plasma grating
photonic bandgap
solitonlike structure
particle- in- cell simulation
