The characteristic of group delay is analyzed based on an electronic circuit, and its time-domain nature is studied with......

应用传输矩阵方法推导了光脉冲在-维光子晶体中的动力演化．若在结构中引入非色散的缺陷时，超光速传播将变成慢光速；若引入含二能级原......

Bessel波束具有奇异的特性，例如在传播中不发生衍射，而且实验测量证明其群速比光速c要大。对其超光速运动可以用球面波前在对称轴上......

In this paper, I discuss whether superluminal particles exist in the general relativistic theory of gravity. It seems th......