Broadband spin-controlled focusing via logarithmic-spiral nanoslits of varying width (pages 674–681)
M. Q. Mehmood, Hong Liu, Kun Huang, Shengtao Mei, Aaron Danner, Boris Luk'yanchuk, Shuang Zhang, Jinghua Teng, Stefan A. Maier and Cheng-Wei Qiu
Article first published online: 19 SEP 2015 | DOI: 10.1002/lpor.201500116
A logarithmic spiral (LS) nanoslit with switchable focusing functionalities has been experimentally demonstrated as a promising candidate to identify the handedness of incident circular polarization. Strongly depending on spin of incident photons, this LS-nanoslit converges the incoming light with opposite handedness (with respect to the handedness of the LS-slit) into a confined subwavelength spot, while the light with identical chirality is structured into a donut-shape profile at the focal plane.