/ P. C. Wu [et al.]> // Photonics Res. - 2018. -
Vol. 6,
Is. 12. - P. 1094-1100,
DOI 10.1364/PRJ.6.001094. - Cited References: 23. - Ministry of Science and Technology, Taiwan (MOST) (106-2923-M-009-002-MY3, 107-2112-M-009-012-MY3).
. - ISSN 2327-9125
РУБ Optics
Аннотация: We propose to dynamically control the reflective color of a cholesteric
liquid crystal (CLC) by electrically tuning the center wavelength (c) 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, c 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 c 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.
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Держатели документа: Natl Chiao Tung Univ, Inst Imaging & Biomed Photon, Coll Photon, Tainan 71150, Taiwan.
Natl Chiao Tung Univ, Inst Lighting & Energy Photon, Coll Photon, Tainan 71150, Taiwan.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch,, Fed Res Ctr,Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Доп.точки доступа: Wu, Po-Chang; Wu, Guan-Wei; Timofeev, I. V.; Тимофеев, Иван Владимирович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Lee, Wei; Ministry of Science and Technology, Taiwan (MOST) [106-2923-M-009-002-MY3, 107-2112-M-009-012-MY3]