Effects of astigmatism and coma on rotating point spread function.

Rotating point spread function (PSF) provides a novel approach to detect three-dimensional position. As the optical aberration of a system can hardly be removed completely, effects of aberration on the PSF were studied both analytically and numerically. Results show that the intensity pattern is robust to both astigmatism and coma, while astigmatism affects the rotating angle of the PSF, and coma affects the lateral position of the PSF.