Tightly focused optical field with controllable photonic spin orientation


Jian Chen and Chenhao Wan and Ling Jiang Kong and Qiwen Zhan


“The spin angular momentum of photons offers a robust, scalable and highbandwidth
toolbox for many promising applications based upon spin-controlled
manipulations of light. In this work, we develop a method to achieve controllable photonic
spin orientation within a diffraction limited optical focal spot produced by a high numerical
aperture objective lens. The required pupil field is found analytically through reversing the
radiation patterns from two electric dipoles located at the focal point of the lens with
orthogonal oscillation directions and quadrature phase. The calculated pupil fields are
experimentally generated with a vectorial optical field generator. The produced photonic spin
orientations are quantitatively evaluated by their spin densities according to the tightly
focused electric fields calculated by Richard-Wolf vectorial diffraction theory to demonstrate
the validity and capability of the proposed technique.”

Link to Publications Page

Publication: Optics Express

Issue/Year/DOI: Optics Express, Volume 25, Number 16 pp. 19517-19528 (2017)
DOI: 10.1364/OE.25.019517