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Light controlled phase shifter for optofluidics.

L Lucchetti, K Kushnir, A Zaltron

    Optics Letters
    |January 15, 2016
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrate light-induced optical phase shifts using lithium niobate (LiNbO3:Fe) crystals and liquid crystals. This enables all-optical switching with high contrast, controlled by a photovoltaic electric field.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Nonlinear Optics

    Background:

    • Liquid crystal cells are widely used in optical devices.
    • Photovoltaic effects in electro-optic crystals can generate electric fields.
    • Controlling optical properties with light is crucial for photonic applications.

    Purpose of the Study:

    • To investigate light-induced optical phase shifts in a liquid crystal cell.
    • To utilize the photovoltaic effect in LiNbO3:Fe substrates for optical control.
    • To achieve all-optical switching using this phenomenon.

    Main Methods:

    • Fabrication of a liquid crystal cell with LiNbO3:Fe crystals as substrates.
    • Application of a pump pulse to induce reorientation of liquid crystals via photovoltaic field.
    • Measurement of optical phase shift and switching contrast.

    Main Results:

    • Achieved significant optical phase shifts (a few πs) for orthogonal polarizations.
    • Demonstrated all-optical switching with approximately 80% contrast.
    • Showcased control using a 2-second pump pulse.

    Conclusions:

    • Light-induced liquid crystal reorientation via photovoltaic fields is an effective method for optical control.
    • This approach enables efficient all-optical switching.
    • LiNbO3:Fe based liquid crystal cells offer a promising platform for optoelectronic devices.