Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 46: Plasmonics and Nanooptics IV: Fabrication and Applications

O 46.9: Vortrag

Mittwoch, 20. März 2024, 12:30–12:45, MA 042

Dissipation-engineered plasmonic ratchet — •Anna Sidorenko¹, Jan Mathis Giesen², Sebastian Eggert², and Stefan Linden¹ — ¹Physikalisches Institut, Universität Bonn, Kreuzbergweg 24, 53115 Bonn, Germany — ²Physics Department and Research Center OPTIMAS, University of Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

A ratchet effect is an ability to convert periodic drive into directed motion without a bias force. The working principle of a ratchet relies on the breaking of space- and time-reversal symmetry that would otherwise not allow a directed current. Based on the quantum-optical analogy, we propose a new design of a plasmonic ratchet. Our implementation features a trimerized lattice where losses are periodically varied while hopping amplitudes and on-site potentials are kept constant. The plasmonic structures were fabricated by means of two-step electron beam lithography. In the produced arrays, the spatial evolution of surface plasmon polaritons (SPPs) was recorded by leakage radiation microscopy. We observe both in numerical calculations and in our measurements a directional transport of SPPs in such an array in a single preferred direction. Control of directionality purely by tailored dissipation distinguishes our system from a simple combination of directional couplers. We examine the effect of different dissipation strengths and durations on the efficiency of transport.

Keywords: Directional transport; Waveguide arrays; Ratchet; Surface plasmon polariton; Dissipation