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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Tuning quantum-dot based photonic devices with liquid crystals.

Karoline A Piegdon1, Stefan Declair, Jens Förstner

  • 1Physics Department and CeOPP, University of Paderborn, Warburger Strasse 100, 33098 Paderborn, Germany.

Optics Express
|July 1, 2010
PubMed
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Researchers tuned photonic crystal modes using liquid crystals. Changing temperature and electric fields altered liquid crystal states, enabling precise control over optical modes in GaAs microdisks with InAs quantum dots.

Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • Semiconductor microdisks with embedded quantum dots are crucial for optoelectronic devices.
  • Liquid crystals offer tunable optical properties based on external stimuli.
  • Integrating liquid crystals with photonic cavities can enable novel tuning mechanisms.

Purpose of the Study:

  • To investigate the use of liquid crystal phase transitions for tuning photonic modes.
  • To explore electric field control of liquid crystal birefringence for mode tuning.
  • To understand liquid crystal alignment on microdisk surfaces.

Main Methods:

  • Fabrication of GaAs microdisks with embedded InAs quantum dots.
  • Immersion of microdisks in 4-cyano-4'-pentylbiphenyl (5CB) liquid crystal.

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  • Temperature-controlled phase transition studies (isotropic to nematic).
  • Application of electric fields to control liquid crystal orientation and birefringence.
  • Finite-difference time-domain (FDTD) simulations for optical mode analysis and molecular alignment.

    • Main Results:

    • Temperature-induced phase transition of 5CB liquid crystal effectively tuned photonic modes.
    • Electric field applied to the nematic liquid crystal externally controlled birefringence.
    • Achieved electric field-induced tuning of microdisk resonator modes.
    • FDTD simulations elucidated liquid crystal molecule alignment on the microdisk surface.

    Conclusions:

    • Liquid crystals provide an effective mechanism for tuning optical modes in quantum dot-embedded microdisks.
    • Electric field control offers a pathway for dynamic, external tuning of photonic devices.
    • The study demonstrates a hybrid optoelectronic system with tunable photonic properties.