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Updated: Apr 28, 2026

Fabrication and Operation of a Nano-Optical Conveyor Belt
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Bandwidth-tunable optical spatial filters with nanoparticle arrays.

Chiya Saeidi, Daniel van der Weide

    Optics Express
    |June 13, 2014
    PubMed
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    We present a novel method for designing tunable optical filters using nanoparticle arrays (NPAs) in a glass slab. This approach allows for efficient bandwidth control by adjusting the permittivity of the surrounding medium, such as liquid crystals.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Optical filters are crucial components in various photonic devices.
    • Tunable optical filters offer enhanced flexibility for wavelength selection.
    • Nanoparticle arrays (NPAs) exhibit unique optical properties suitable for resonator applications.

    Purpose of the Study:

    • To propose a systematic design approach for efficient optical filters with tunable bandwidth.
    • To model a nanoparticle array (NPA) within a thin glass slab as a lumped optical resonator.
    • To demonstrate the tunability of the filter's bandwidth by altering the surrounding medium's permittivity.

    Main Methods:

    • Modeling an NPA inside a thin glass slab as a lumped optical resonator.
    • Relating resonator quality factor and bandwidth to physical, geometrical, and electrical parameters of the NPA.

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  • Utilizing a liquid crystal medium surrounding the NPA slab to enable permittivity variation for bandwidth tuning.

    • Main Results:

    • A validated design procedure for creating optical filters with tunable bandwidth.
    • Demonstration of bandwidth tunability across different frequency regimes, from near-infrared (NIR) to blue light.
    • The proposed structure, featuring an NPA slab within a liquid crystal, proves effective for achieving desired filter characteristics.

    Conclusions:

    • The developed systematic approach enables efficient design of tunable optical filters based on NPAs.
    • The use of liquid crystals provides a practical method for actively controlling the filter bandwidth.
    • This design methodology is applicable to a wide range of optical frequencies, offering versatile filter solutions.