Rotating light field produced by using radiation pattern of turnstile antenna

In this paper we have presented a solution to generate rotating light field using a turnstile antenna in conjunction with a 4Pi focusing system. The basic function of the revolving gate antenna is to place two short dipoles vertically and encouraging each other by 90 phase shifts. The experimental data show that the rotating focal field generated above rotating around the center of the optical axis at a frequency radian
$\omega$
, and
$-\boldsymbol{\omega t}$
means the angle of the focal field of left,
$\boldsymbol{\omega t}$
means the angle of the focal field of right and the distribution of intensity shows “8” shape. This “8” form tends to be a flawless dot in steady state, when
$\boldsymbol{\omega}$
is large enough.