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Optical vortex arrays from smectic liquid crystals.

Baeksik Son, Sejeong Kim, Yun Ho Kim

    Optics Express
    |March 26, 2014
    PubMed
    Summary

    We created large optical vortex arrays using self-assembled defects in liquid crystals. These focal conic domains generate optical vortices with a topological charge of 2, confirmed by interferometry.

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    Area of Science:

    • Photonics and optical physics
    • Soft matter physics
    • Materials science

    Background:

    • Optical vortices are beams with helical phase fronts.
    • Controlling optical vortex generation is crucial for applications in optical trapping and information processing.
    • Liquid crystals offer tunable optical properties and self-assembly capabilities.

    Purpose of the Study:

    • To demonstrate the generation of large-area, closely-packed optical vortex arrays.
    • To utilize self-assembled defects in smectic liquid crystals for creating optical vortices.
    • To characterize the topological charge and formation of these optical vortices.

    Main Methods:

    • Self-assembly of smectic liquid crystals into three-dimensional torus structures (focal conic domains).
    • Characterization of optical vortex formation using interferometry.
    • Theoretical prediction and validation using Jones matrix calculations.

    Main Results:

    • Successfully generated large-area, closely-packed optical vortex arrays.
    • Each focal conic domain produced an optical vortex with a consistent topological charge of 2.
    • Interferometry confirmed the spiral phase profile characteristic of optical vortices.

    Conclusions:

    • Self-assembled focal conic domains in smectic liquid crystals are an effective method for generating optical vortex arrays.
    • The consistent topological charge of 2 for each vortex is a significant finding.
    • This technique offers a promising route for scalable production of optical vortex arrays for various applications.