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Liquid-crystal tunable filter based on sapphire microspheres.

Giovanni Gilardi1, Domenico Donisi, Ali Serpengüzel

  • 1Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, Via del Fosso del Cavaliere 100, Roma, Italy. giovanni.gilardi@artov.imm.cnr.it

Optics Letters
|November 3, 2009
PubMed
Summary

Researchers developed an electrically tunable optical filter using a sapphire microsphere and liquid crystal. This device demonstrates voltage-controlled tuning of narrowband resonances for optical filtering applications.

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Area of Science:

  • Optoelectronics
  • Photonics
  • Materials Science

Background:

  • Whispering-gallery mode (WGM) resonators offer high-Q optical resonances.
  • Integrating tunable media with WGM resonators is crucial for practical devices.
  • Sapphire microspheres provide robust platforms for WGM resonators.

Purpose of the Study:

  • To design and numerically evaluate an integrated optoelectronic device for narrowband optical filtering.
  • To achieve electrical tunability of optical resonances using a liquid-crystal medium.
  • To demonstrate voltage-controlled channel dropping in an optical filter.

Main Methods:

  • Fabrication of an integrated device comprising a sapphire microsphere over a diffused waveguide.
  • Infiltration of a liquid crystal tuning medium at the base of the microsphere.

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  • Numerical evaluation of the device's optical performance and tuning characteristics.

    • Main Results:

    • Demonstration of narrowband resonances based on whispering-gallery modes.
    • Successful integration of a liquid crystal for tuning the optical response.
    • Numerical validation of voltage-induced tuning of the filter's resonances.

    Conclusions:

    • The proposed optoelectronic device enables electrically tunable, narrowband optical filtering.
    • Sapphire microspheres combined with liquid crystals are a viable approach for tunable photonic devices.
    • The device shows potential for applications in optical communication and signal processing.