Ultrahigh extinction-ratio circular polarization analyzer with chiral plasmonic lens

Baifu Zhang; Jianping Ding

doi:10.1117/12.2506004

15 November 2018 Ultrahigh extinction-ratio circular polarization analyzer with chiral plasmonic lens

Baifu Zhang, Jianping Ding

Proceedings Volume 10964, Tenth International Conference on Information Optics and Photonics; 109643X (2018) https://doi.org/10.1117/12.2506004
Event: Tenth International Conference on Information Optics and Photonics (CIOP 2018), 2018, Beijing, China

Abstract

A chiral plasmonic lens (CPL) suitable for circular polarization analyzer is designed and numerically investigated. It consists of two arrays of rectangular nanoslits milled into a gold film along Archimedes spirals. We demonstrate both theoretically and numerically that the designed structure can convert an incident circularly polarized light beam with prescribed chirality into a Bessel-like distributed focus, but the circularly polarized one with the opposite chirality cannot be transmitted and focused by the same CPL due to the alternative chirality. Further, three-dimensional finite-difference time-domain (FDTD) simulations show that an ultrahigh extinction ratio up to ten thousands of the CPL is numerically achieved with a device less than 10 λ_spp, which is two orders higher than that of a conventional plasmonic circularization analyzer with single Archimedes-spiral groove. The designed structure can be widely used in miniature polarimeter and detection of spin angular momentum.

Citation Download Citation

Baifu Zhang and Jianping Ding "Ultrahigh extinction-ratio circular polarization analyzer with chiral plasmonic lens", Proc. SPIE 10964, Tenth International Conference on Information Optics and Photonics, 109643X (15 November 2018); https://doi.org/10.1117/12.2506004

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