Electro-thermally tunable reflective colors in a self-organized cholesteric helical superstructure : научное издание | Научно-инновационный портал СФУ

Electro-thermally tunable reflective colors in a self-organized cholesteric helical superstructure : научное издание

Тип публикации: статья из журнала

Год издания: 2018

Идентификатор DOI: 10.1364/PRJ.6.001094

Ключевые слова: Capacitance, Cholesteric liquid crystals, Dielectric relaxation, Electric fields, Electrodes, Infrared devices, Nematic liquid crystals, Photonic devices, Tin oxides, Electrically tunable, Equivalent resistance, Helical superstructure, Induced temperature, Negative dielectric anisotropy, Spectral properties, Tin oxide electrodes, Tunable photonic devices, Tuning

Аннотация: We propose to dynamically control the reflective color of a cholesteric liquid crystal (CLC) by electrically tuning the center wavelength (lambda(c)) of the bandgap. The CLC, sandwiched in a planar-aligned cell with indium-tin-oxide electrodes, possesses We propose to dynamically control the reflective color of a cholesteric liquid crystal (CLC) by electrically tuning the center wavelength (λc) of the bandgap. The CLC, sandwiched in a planar-aligned cell with indium–tin-oxide electrodes, possesses negative dielectric anisotropy and thermo-responsive spectral properties. The helix in the Grandjean planar state, which is subject to vertically applied voltage, should be undisturbed in that the long molecular axis is initially perpendicular to the direction of the electric field. Surprisingly, when the frequency of the applied voltage is higher than a critical value, λc of the CLC cell varies as a function of the voltage. The underlying mechanism is the voltage-induced temperature change through dielectric heating in the frequency regime of pseudo-dielectric relaxation, attributable to the significant equivalent resistance–capacitance circuit of the cell due to the use of electrode layers with finite conductance. The driving voltage enabling the tuning of λc in the entire visible spectrum is as low as 12 Vrms in a 5 μm thick cell at a frequency of 2 MHz. The proposed CLC cell, exhibiting a broad electrically tunable spectral range from the near-infrared to ultraviolet, holds great promise for developing tunable photonic devices such as multicolor reflectors, filters, and sensors. © 2018 Chinese Laser Press.

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Издание

Журнал: PHOTONICS RESEARCH

Выпуск журнала: Vol. 6, Is. 12

Номера страниц: 1094-1100

ISSN журнала: 23279125

Место издания: WASHINGTON

Издатель: OPTICAL SOC AMER

Авторы

  • Wu Po-Chang (Natl Chiao Tung Univ, Inst Imaging & Biomed Photon, Coll Photon, Tainan 71150, Taiwan)
  • Wu Guan-Wei (Natl Chiao Tung Univ, Inst Lighting & Energy Photon, Coll Photon, Tainan 71150, Taiwan)
  • Timofeev Ivan V. (Russian Acad Sci, Kirensky Inst Phys, Siberian Branch,, Fed Res Ctr,Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660041, Russia)
  • Zyryanov Victor Ya. (Russian Acad Sci, Kirensky Inst Phys, Siberian Branch,, Fed Res Ctr,Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia)
  • Lee Wei (Natl Chiao Tung Univ, Inst Imaging & Biomed Photon, Coll Photon, Tainan 71150, Taiwan)

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