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Electrically Controlled Liquid Crystal Twist-Planar Fresnel Lens
Abstract
Based on the method of photo-orientation of azo dye AtA-2, an electrically controllable Fresnel lens has been developed, representing a microstructured liquid crystal element with alternating rings with twist- and planar orientations of the liquid crystal director. It is shown that the use of the control voltage allows one to control the efficiency of laser radiation focusing, as well as to turn off the lens. The optimum value of the control voltage (~3 V) is determined, at which the maximum focusing efficiency and satisfactory quality of imaging in a wide spectral range from 530 nm to 1.1 μm are achieved.
Keywords
Fresnel lens,
diffraction lens,
nematic liquid crystal,
photo-orientation,
electrically controlled diffraction
Supporting agencies: The work was carried out with the financial support of the State Research Institute “Convergence-2025”
About the Authors
E. A. Melnikova
Belarusian State University
Belarus
Belarus
Minsk
E. P. Panteleeva
Belarusian State University
Belarus
Belarus
Minsk
D. V. Gorbach
Belarusian State University
Belarus
Belarus
Minsk
A. L. Tolstik
Belarusian State University
Belarus
Belarus
Minsk
I. I. Rushnova
Belarusian State University
Belarus
Belarus
Minsk
O. S. Kabanova
Belarusian State University
Belarus
Belarus
Minsk
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Review
For citations:
Melnikova E.A., Panteleeva E.P., Gorbach D.V., Tolstik A.L., Rushnova I.I., Kabanova O.S. Electrically Controlled Liquid Crystal Twist-Planar Fresnel Lens. Zhurnal Prikladnoii Spektroskopii. 2024;91(5):741-746. (In Russ.)
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