Propagative Oscillations in Codirectional Polariton Waveguide Couplers

Passive-Routing-of-a-Quantum-Fluid

Article published in Physical Review Letters by Luis Viña, IFIMAC researcher.

In this work, the passive routing of a propagating quantum fluid of light is demonstrated. This routing is achieved by using a Josephson-like oscillation of the fluid between two coupled waveguides. Hybrid light matter particles, called exciton-polaritons, can undergo a phase transition into a bosonic condensed state. This state exhibits exceptional effects, e.g., pronounced nonlinearities, quantized vortices or superfluidity, thus justifying the designation “Quantum Fluid of Light”. We have successfully routed such a fluid, carrying out a precise control of the coupling between two confining waveguides, paving the way towards the development of full-optical, polaritonic logic networks. The partition of the condensate between the two arms of the couplers can be conveniently achieved by adjusting the energy and propagation speed inside a single device or the coupling strength in different devices.

See full article Phys. Rev. Lett. 126, 075302 (2021).

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