Heliconical cholesteric liquid crystals as electrically tunable optical filters in notch and bandpass configurations

Heliconical cholesteric liquid crystals as electrically tunable optical filters in notch and bandpass configurations
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螺旋胆甾液晶作为陷波和带通配置的电可调光学滤波器

DOI:
10.1080/02678292.2021.1884911
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发表时间:
2021
期刊:
影响因子:
2.2
通讯作者:
Lucchetti, Liana
Lucchetti, Liana
中科院分区:
化学3区
文献类型:
--
作者:
Nava, G.;Ciciulla, F.;Simoni, F.;Iadlovska, O.;Lavrentovich, O. D.;Lucchetti, Liana

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螺旋双极性液晶是近年来提出的一类新型液晶材料,其中手性螺距可以通过平行于螺旋轴的外电场来调节。在这里,我们表明,这些材料可以用作一个简单的架构的可调谐光学滤波器。透射光的光谱特性可以在整个可见光范围内调谐。特别是,通过将外加电场从2.7 V/µm改变到1.7 V/µm,可以将带通波长从405 nm移动到637 nm。电场还可以在1 s或更短的时间内打开和关闭滤波器。此外,滤波器可以处理偏振光和非偏振光,并且可以通过改变入射光的偏振来从陷波切换到带通配置。三个不同的激光线之间的光开关也报告作为一个额外的可能的应用。
Heliconical cholesteric liquid crystals are a recently proposed novel class of liquid crystalline materials in which the chiral pitch can be tuned by an external electric field acting parallel to the helical axis. Here we show that these materials can be used as tunable optical filters of a simple architecture. The spectral properties of transmitted light can be tuned within the whole visible range. In particular, the bandpass wavelength can be shifted from 405 nm to 637 nm by changing the applied field from 2.7 to 1.7 V/µm. The electric field can also switch the filters on and off, within 1 s or less. Moreover, the filters work with both polarised and unpolarised light and can be switched from a notch to a bandpass configuration by changing the polarisation of incident light. An optical switch among three different laser lines is also reported as an additional possible application.
使用液晶可变延迟器的可调谐双折射滤光片
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