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Hybrid light–matter states formed in self-assembling cavities - Nature.com

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Hybrid light–matter states formed in self-assembling cavities

Tiny flakes of metal suspended in a solution have been observed to self-assemble into pairs separated by a narrow gap — offering a tunable system for studying combinations of light and matter known as polaritons.
  1. Johannes Feist

    1. Johannes Feist is in the Department of Theoretical Condensed Matter Physics and the Condensed Matter Physics Center (IFIMAC), Autonomous University of Madrid, Madrid E-28049, Spain.

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Stable physical systems generally require a balance between attractive forces that pull their components together and repulsive forces that push them apart. For example, Earth’s gravity pulls us down, but our feet do not sink through the floor because of the overall repulsive electrical forces between the electrons and nuclei that both we and the floor are made of. On a microscopic level, the stability of materials is due to the electrostatic interaction between charged electrons and nuclei, with like charges repelling and opposite charges attracting each other. Writing in Nature, Munkhbat et al.1 report that a different balance of attraction and repulsion can cause two or more microscopic metal flakes to form an optical cavity by self-assembly — generating a pair of mirrors that can trap light between them. Such cavities have a wide range of uses because they modify the interaction between light and matter within them.

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Nature 597, 185-186 (2021)

doi: https://doi.org/10.1038/d41586-021-02376-y

References

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Competing Interests

The author declares no competing interests.

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