Parabolic-symmetry vector optical fields and their tightly focusing properties.

We present theoretically and generate experimentally a vector optical field with parabolic symmetry of linear polarization. We extend the study to the modified parabolic-symmetry vector fields. We explore their tightly focusing behaviors, in particular, a modified parabolic-symmetry vector field can be tightly focused into a high-performance subwavelength sharp line. [ABSTRACT FROM AUTHOR]