Focusing and propagation characteristics of radially polarized helical-conical Airy beams

This paper uses a spiral cone wavefront to modulate a radially polarized Airy beam. Based on the vector diffraction theory, the focusing and propagation characteristics of a radially polarized spiral cone Airy beam are studied. In order to conduct in-depth analysis on the unique properties of radial polarized spiral cone-shaped Airy beams, the focused light intensity, optical gradient force distribution, and propagation characteristics under different spiral cone parameters were simulated. The results show that the parameters of the helical-conical have a significant effect on the focusing characteristics of the radially polarized helical-conical Airy beam. The radial polarization of the radially polarized helical-conical Airy beam shows a lateral stretching trend. During propagation, focused light field distribution gradually becomes an optical trap. The light trap-like mode displayed after Airy beam modulation can be applied to optical tweezers operation, optical capture, and other fields.