Electrically Controlled Birefringence and Dielectric Susceptibility of Helical Nanostructures of Ferroelectric Liquid Crystals

Tkachenko, T. P.; Kuznetsov, A. V.; Pozhidaev, E. P.

doi:10.3103/s1068335620080096

Cited by 1 publication

(2 citation statements)

References 12 publications

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“…Here

is the angle between the first polarizer and x axis, and

is the phase retardation, which is written as:

and

at E << E c ( E c is the critical field of the helix unwinding [ 74 ]) is expressed as [ 33 , 34 , 67 , 75 , 76 ]:

where

…”

Section: Comparison Of the Electrooptic Response Of Nh-flcs With Nlcsmentioning

confidence: 99%

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Helical Nanostructures of Ferroelectric Liquid Crystals as Fast Phase Retarders for Spectral Information Extraction Devices: A Comparison with the Nematic Liquid Crystal Phase Retarders

et al. 2021

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Extraction of spectral information using liquid crystal (LC) retarders has recently become a topic of great interest because of its importance for creating hyper- and multispectral images in a compact and inexpensive way. However, this method of hyperspectral imaging requires thick LC-layer retarders (50 µm–100 µm and above) to obtain spectral modulation signals for reliable signal reconstruction. This makes the device extremely slow in the case of nematic LCs (NLCs), since the response time of NLCs increases proportionally to the square of the LC-layer thickness, which excludes fast dynamic processes monitoring. In this paper, we explore two approaches for solving the speed problem: the first is based on the use of faster nanospiral ferroelectric liquid crystals as an alternative to NLCs, and the second is based on using a passive multiband filter and focuses on multispectral extraction rather than hyperspectral. A detailed comparative study of nematic and ferroelectric devices is presented. The study is carried out using a 9-spectral bands passive spectral filter, covering the visible and near-infrared ranges. We propose the concept of multispectral rather than hyperspectral extraction, where a small number of wavelengths are sufficient for specific applications.

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“…Here

is the angle between the first polarizer and x axis, and

is the phase retardation, which is written as:

and

at E << E c ( E c is the critical field of the helix unwinding [ 74 ]) is expressed as [ 33 , 34 , 67 , 75 , 76 ]:

where

…”

Section: Comparison Of the Electrooptic Response Of Nh-flcs With Nlcsmentioning

confidence: 99%

“…and ∆n eff (E) at E << E c (E c is the critical field of the helix unwinding [74]) is expressed as [33,34,67,75,76]:…”

Section: Comparison Of the Electrooptic Response Of Nh-flcs With Nlcsmentioning

confidence: 99%

Helical Nanostructures of Ferroelectric Liquid Crystals as Fast Phase Retarders for Spectral Information Extraction Devices: A Comparison with the Nematic Liquid Crystal Phase Retarders

et al. 2021

View full text Add to dashboard Cite

show abstract

Electrically Controlled Birefringence and Dielectric Susceptibility of Helical Nanostructures of Ferroelectric Liquid Crystals

Cited by 1 publication

References 12 publications

Helical Nanostructures of Ferroelectric Liquid Crystals as Fast Phase Retarders for Spectral Information Extraction Devices: A Comparison with the Nematic Liquid Crystal Phase Retarders

Helical Nanostructures of Ferroelectric Liquid Crystals as Fast Phase Retarders for Spectral Information Extraction Devices: A Comparison with the Nematic Liquid Crystal Phase Retarders

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