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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Hyperspectral imaging with a liquid crystal polarization interferometer.

Alex Hegyi, Joerg Martini

    Optics Express
    |November 13, 2015
    PubMed
    Summary

    A new hyperspectral imaging system uses a liquid crystal variable retarder to create a hyperspectral data-cube. This compact, vibration-insensitive device offers adaptable spectral and spatial resolution for diverse applications.

    Area of Science:

    • Optics and Photonics
    • Imaging Technology
    • Spectroscopy

    Background:

    • Hyperspectral imaging captures detailed spectral information across spatial dimensions.
    • Traditional hyperspectral systems can be complex, bulky, and sensitive to environmental factors like vibrations.
    • There is a need for compact, robust, and adaptable hyperspectral imaging solutions.

    Purpose of the Study:

    • To develop a novel, compact, and vibration-insensitive hyperspectral imaging system.
    • To demonstrate the feasibility of using a liquid crystal variable retarder for hyperspectral data acquisition.
    • To enable software-based trade-offs between spectral resolution, imaging speed, and spatial resolution.

    Main Methods:

    • A liquid crystal variable retarder was integrated into a commercial CMOS camera to control polarization path delay.

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  • Varying the path delay generated interferograms at each pixel, forming a series of images.
  • Fourier transformation of the image series with respect to path delay reconstructed the hyperspectral data-cube.

    • Main Results:

    • A prototype hyperspectral imager was successfully demonstrated, acquiring data from 400 nm to 1100 nm.
    • The system achieved a full hyperspectral data-cube acquisition in 0.4 seconds.
    • The polarization interferometer design resulted in a vibration-insensitive common-path optical system.
    • Spectral resolution ranged from 450 cm⁻¹ to 660 cm⁻¹, depending on dispersion.

    Conclusions:

    • The developed liquid crystal-based hyperspectral imager is compact, fast, and vibration-insensitive.
    • Software adaptability allows for flexible optimization of imaging parameters for specific applications.
    • The system's simplicity, potential low cost, and adaptability position it for broad applications and disruptive potential in hyperspectral imaging.