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5 October 2015 Electrically tunable selective reflection of light by heliconical cholesteric structures (Presentation Recording)
Oleg D. Lavrentovich, Jie Xiang, Sergij V. Shiyanovskii, Quan Li
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Proceedings Volume 9565, Liquid Crystals XIX; 95650F (2015) https://doi.org/10.1117/12.2185601
Event: SPIE Organic Photonics + Electronics, 2015, San Diego, California, United States
Abstract
Cholesteric liquid crystals with helicoidal molecular architecture are known for their ability to selectively reflect light with the wavelength that is determined by the periodicity of molecular orientations. Resulting interference colors are highly saturated, they add like colored lights and produce a color gamut greater than that obtained with inks, dyes, and pigments. The periodicity of the helical structure and thus the wavelength of the reflected light can be controlled by chemical composition and sometimes by temperature, but tuning with the electric field has been so far elusive. Here we demonstrate that by using a cholesteric with oblique helicoidal (heliconical) structure, as opposed to the classic “right-angle” helicoid, one can vary the wavelength of selectively reflected light in a broad spectral range, by simply adjusting the electric field applied parallel to the helicoidal axis. The effect can enable many applications that require dynamically controlled transmission and reflection of light, from energy-saving smart windows to tunable organic lasers, and transparent “see-through” displays. Since the material is non-absorbing and transparent everywhere except the electrically preselected reflection band, the effect can be used in creating multilayered structures with a dynamic additive mixture of colors.
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View presentation video on SPIE’s Digital Library: http://dx.doi.org/10.1117/12.2185601.4519371773001
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Oleg D. Lavrentovich, Jie Xiang, Sergij V. Shiyanovskii, and Quan Li "Electrically tunable selective reflection of light by heliconical cholesteric structures (Presentation Recording)", Proc. SPIE 9565, Liquid Crystals XIX, 95650F (5 October 2015); https://doi.org/10.1117/12.2185601
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KEYWORDS
Liquid crystals
Laser applications
Multilayers
Tunable lasers
Current controlled current source
LCDs
Lithium
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