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arXiv · 1812.03721

A Spin-Optical Nano Device

Enno Krauss·Gary Razinskas·Dominik Köck·Swen Grossmann·Bert Hecht
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Abstract

The photon spin is an important resource for quantum information processing as is the electron spin in spintronics. However, for subwavelength confined optical excitations, polarization as a global property of a mode cannot be defined. Here, we show that any polarization state of a plane-wave photon can reversibly be mapped to a pseudo-spin embodied by the two fundamental modes of a subwavelength plasmonic two-wire transmission line. We design a device in which this pseudo-spin evolves in a well-defined fashion throughout the device reminiscent of the evolution of photon polarization in a birefringent medium and the behaviour of electron spins in the channel of a spin field-effect transistor. The significance of this pseudo-spin is enriched by the fact that it is subject to spin-orbit locking. Combined with optically active materials to exert external control over the pseudo-spin precession, our findings could enable spin-optical transistors, i.e. the routing and processing of quantum information with light on a subwavelength scale.

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Enno Krauss, Gary Razinskas, Dominik Köck, Swen Grossmann, Bert Hecht. 2018-12-10. A Spin-Optical Nano Device. https://arxiv.org/abs/1812.03721

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