Photonic-crystal exciton-polaritons in monolayer semiconductors

Long Zhang, Rahul Gogna, Will Burg, Emanuel Tutuc and Hui Deng ()
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Long Zhang: University of Michigan
Rahul Gogna: University of Michigan
Will Burg: The University of Texas at Austin
Emanuel Tutuc: The University of Texas at Austin
Hui Deng: University of Michigan

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Semiconductor microcavity polaritons, formed via strong exciton-photon coupling, provide a quantum many-body system on a chip, featuring rich physics phenomena for better photonic technology. However, conventional polariton cavities are bulky, difficult to integrate, and inflexible for mode control, especially for room-temperature materials. Here we demonstrate sub-wavelength-thick, one-dimensional photonic crystals as a designable, compact, and practical platform for strong coupling with atomically thin van der Waals crystals. Polariton dispersions and mode anti-crossings are measured up to room temperature. Non-radiative decay to dark excitons is suppressed due to polariton enhancement of the radiative decay. Unusual features, including highly anisotropic dispersions and adjustable Fano resonances in reflectance, may facilitate high temperature polariton condensation in variable dimensions. Combining slab photonic crystals and van der Waals crystals in the strong coupling regime allows unprecedented engineering flexibility for exploring novel polariton phenomena and device concepts.

Date: 2018
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DOI: 10.1038/s41467-018-03188-x

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