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Optical Moiré Lattices Produce Solitons

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SHANGHAI, Oct. 14, 2020 — Researchers from Jiao Tong University discovered that optical moiré lattices can produce solitons — self-trapped solitary waves — at extremely low power levels. The research establishes potential to explore nonlinear phenomena such as four-wave mixing and second-harmonic generation. The research stems from an earlier discovery in Fangwei Ye’s lab, in which his team discovered a way to stop the spreading of light and localize a laser into a tight spot using moiré lattices. The current work is an extension of the discovery; it excites the light in...Read full article

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    Published: October 2020
    Glossary
    optical lattice
    A periodic structure formed by intersecting or superimposed laser beams. These beams can trap atoms in low-potential regions, forming a pattern of atoms resembling the structure of a crystal.
    lattice
    A regular spatial display of points representing, for example, the sites of atoms in a crystal.
    diffraction
    As a wavefront of light passes by an opaque edge or through an opening, secondary weaker wavefronts are generated, apparently originating at that edge. These secondary wavefronts will interfere with the primary wavefront as well as with each other to form various diffraction patterns.
    mask
    1. A framelike structure that serves to restrict the viewing area of the screen when placed before a television picture tube. 2. In photolithography, a photomask (or mask) is typically a patterned transparent plate or an opaque plate with patterned holes or transparencies that uses a laser light source to transfer and print the pattern by an etching process onto a substrate that is typically a silicon wafer used in integrated circuitry.
    Research & Technologyoptical latticemoire latticesoliton generationChinaAsia-PacificShanghai Jiao Tong Universityphotonic crystallatticediffractionnonlineartelecommunicationLasersmask

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