2020
DOI: 10.3390/s20164643
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Characterization of Second-Order Reflection Bands from a Cholesteric Liquid Crystal Cell Based on a Wavelength-Swept Laser

Abstract: We report the results of an experimental study of the characterization of second-order reflection bands from a cholesteric liquid crystal (CLC) cell that depends on the applied electric field, using a wide bandwidth wavelength-swept laser. The second-order reflection bands around 1300 nm and 1500 nm were observed using an optical spectrum analyzer when an electric field was applied to a horizontally oriented electrode cell with a pitch of 1.77 μm. A second-order reflection spectrum began to appear when the int… Show more

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Cited by 9 publications
(5 citation statements)
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“…The prepared CLC had chiral dopant concentrations of 12.93 wt.%. After the light source of the broadband WSL was vertically incident on the fabricated optical-fiber ferrule-based CLC cell, the transmission spectra were measured to calculate the CLC pitch [ 24 ]. The transmission spectrum of the CLC cell with a chiral concentration of 12.93 wt.% is displayed in Figure 1 .…”
Section: Fabrication Of the Clc Cellmentioning
confidence: 99%
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“…The prepared CLC had chiral dopant concentrations of 12.93 wt.%. After the light source of the broadband WSL was vertically incident on the fabricated optical-fiber ferrule-based CLC cell, the transmission spectra were measured to calculate the CLC pitch [ 24 ]. The transmission spectrum of the CLC cell with a chiral concentration of 12.93 wt.% is displayed in Figure 1 .…”
Section: Fabrication Of the Clc Cellmentioning
confidence: 99%
“…The short- and long-wavelength edges are 993 and 1148 nm, respectively, and the 3 dB bandwidth is approximately 155 nm. The pitch of the CLC is calculated by dividing the center wavelength of the transmission band by the average refractive index of the CLC cell [ 24 , 30 ]. The pitch of the CLC calculated using the transmission optical spectrum was approximately 670 nm.…”
Section: Fabrication Of the Clc Cellmentioning
confidence: 99%
See 1 more Smart Citation
“…WSLs can be implemented using a variety of methods. Among them, the polygonal scanning wavelength filter-based WSL [ 2 , 3 , 4 , 17 , 18 , 19 , 20 ] and the Fabry-Perot tunable filter (FFP-TF)-based WSL [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 21 , 22 , 23 ] have been studied most actively. In addition, an electro-optical tunable filter (EOTF) [ 24 ] and acousto-optic tunable filter (AOTF) [ 25 , 26 ] have been researched.…”
Section: Introductionmentioning
confidence: 99%
“…An AOTF also has the advantage of no mechanical drive; however, the bandwidth of the maximum gain is not sufficiently wide and the scanning speed is slow [25,26]. Although the polygonal scanning wavelength filter is relatively bulky and is limited Sensors 2021, 21, 3053 2 of 12 by mechanical driving, it is possible to easily change the scanning speed and scanning wavelength range by adjusting the rotation speed, diffraction grating angle, and the magnification of the telescope [2][3][4][17][18][19][20].…”
Section: Introductionmentioning
confidence: 99%