FERROELECTRIC HELICAL LIQUID CRYSTAL MATERIAL AND METHOD FOR REALIZING SECOND HARMONIC ENHANCEMENT THEREFOR
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United States of America
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Feb 6, 2025
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Oct 30, 2022
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Oct 30, 2022
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Abstract
The present invention discloses a ferroelectric helical liquid crystal material and a method for realizing second harmonic enhancement therefor. By means of the method, a ferroelectric helical liquid crystal with an ultrahigh polarity helical structure is obtained by doping chiral molecules with ferroelectric nematic phase liquid crystals, and a dielectric constant of the ferroelectric helical liquid crystal is 104. This type of liquid crystal material has a superstrong nonlinear optical effect and can excite high-intensity second harmonic waves (for example, a nonlinear coefficient of the liquid crystal material is equivalent to that of a LiNbO3 nonlinear (NLO) crystalline material). Based on adjustability of a periodical helical structure of the ferroelectric helical liquid crystal, a molecular pitch of the ferroelectric helical liquid crystal is tuned by means of a concentration of chiral molecules (i.e., a polarization period is regulated).
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