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Dynamically Tunable Optical Cavities with Embedded Nematic Liquid Crystalline Networks.

Irina Zubritskaya1,2, Rafael Cichelero2, Ihar Faniayeu2

  • 1Geballe Laboratory for Advanced Materials, Stanford University, 476 Lomita Mall, Stanford, CA, 94305, USA.

Advanced Materials (Deerfield Beach, Fla.)
|January 23, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a new solid-state tunable optical cavity using liquid crystalline networks (LCNs). This innovation allows dynamic control of light for advanced sensing and display applications, overcoming limitations of previous technologies.

Keywords:
Fabry-Pérot cavitiesdynamic tuningelastomersliquid crystalline networksmetal-insulator-metal resonatorsstimuli-responsive polymerstunable optical cavities

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Area of Science:

  • Photonics
  • Materials Science
  • Optoelectronics

Background:

  • Metal-insulator-metal (MIM) Fabry-Pérot (FP) cavities are crucial for sensing, imaging, and display technologies.
  • Existing tunable cavities face challenges like low tunability, high losses, limited spectral range, and use of hazardous materials.

Purpose of the Study:

  • To introduce a novel tuning mechanism for optical cavities using reversible mechanical adaptations of polymer networks.
  • To demonstrate dynamic tuning of optical resonances in solid-state microcavities.

Main Methods:

  • Developed solid-state temperature-responsive optical coatings using monodomain nematic liquid crystalline networks (LCNs).
  • Integrated LCN coatings between metallic mirrors to create active optical microcavities.
  • Utilized thermomechanical actuation for spectral tuning of FP resonances.

Main Results:

  • Achieved large, reversible, and linear spectral tuning of FP resonances up to 40 nm wavelength shifts.
  • Demonstrated outstanding repeatability and precision over 100 heating-cooling cycles.
  • Enabled reversible switching between reflective and absorbing states across visible and near-infrared regions with 79% modulation efficiency (ΔR).

Conclusions:

  • LCN microcavities offer a robust and efficient solid-state solution for dynamic optical cavity tuning.
  • The proposed thermomechanical actuation mechanism overcomes limitations of existing tunable cavity technologies.
  • This advancement paves the way for next-generation sensing, imaging, and display devices.