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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 24: Plasmonics & Nanooptics I: Metastructures and Novel Techniques (joint session O/CPP)

O 24.3: Vortrag

Dienstag, 2. April 2019, 11:00–11:15, H8

A Spin-Optical Nano Device — •Enno Krauss1, Gary Razinskas1, Dominik Köck1, Swen Grossmann1, and Bert Hecht1,21Nano-Optics and Biophotonics Group, Department of Experimental Physics 5, University of Würzburg, Würzburg, Germany — 2Wilhelm-Conrad-Röntgen-Center for Complex Material Systems (RCCM), University of Würzburg, Würzburg, Germany

The photon spin is an important resource for quantum information processing as is the electron spin in spintronics. However, for subwavelength confined optical excitations, polarisation as a global property of a mode cannot be defined. Here, we show that any polarisation 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 way throughout the device reminiscent of the evolution of photon polarisation 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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