Multiple Intensity Peaks Generation by a Radial Sine Phase Plate

Intensity distribution in focal region plays an important role in many optical systems, such as in optical tweezers, one intensity peak may act as one optical trap. In this article, the intensity in focal region induced by radial sine pure phase plate is investigated, and it was found that the phase plate can adjust focal intensity considerably. Especially, multiple intensity peaks can come into being and peak pattern can be altered by parameter in sine function of the phase plate, which may be used to construct multiple optical traps in one focusing system.