If the helical structure of Ch phase or N * phase in which liquid crystal molecules themselves have chirality, Oh
Rui if it contains a chiral molecules in the liquid crystal, generates a twist in the interactions between molecules
formed in order to force that occurs differentially. Although Ch phase and the N * phase is a liquid crystal phase synonymous, key
expression molecule with a cholesterol skeleton among the liquid crystal molecules with a Rariti
LCD Ch phase liquid crystal phase to, molecules that do not have a cholesterol skeleton expressed phase the
57 to be classified as N * phase. Thereafter, in this paper dealing with such a liquid crystal phase as a N * phase
to that.
N * phase have specific optical properties based on the spiral molecular arrangement. For example,
the refractive index of N * liquid crystal which changes periodically with the spiral structure, the left and right circularly polarized light component
of the, in the same direction of the circularly polarized light with the direction of the helix, the wavelength corresponding to the helical pitch
only selectively light The reflected to (selective reflection) 60. Helical pitch of the N * phase is good thermal and electrical field
because it can be changed by UNA external stimuli, and also control the selective reflection wavelength
is possible. In addition, luminescent molecules circularly polarized departure by aggregated helically
and examples showing light, and by matching the selective reflection wavelength and the emission wavelength, racemate
work N structure as a resonator, and shows a laser oscillator Examples also because it has been reported
61-63, the substance having an N * liquid crystal has the potential to be a very useful optical material
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