The geometry description of polarization is come up in 1892 and Poincare constructs the Poincare sphere.From then on Poi......

Recently,the tight focuisng properties of vector optical fileds have attracted a great attention,and many applications h......

　　As an important nature of light,polarization demonstrates unique features and various applications.There has been a ......

The natural filtrations of the general algebra -W and the special algebra -S of formal vectorfields are proved to be inv......