Heliconical cholesteric liquid crystals are expected to be more sensitive to torque induced by light field since their structure allows both bend and twist in molecular orientations, differently from the conventional cholesterics in which only twist deformation is involved, requiring much higher fields. We report here a demonstration of tuning the helical pitch in heliconical cholesterics induced by an optical torque. Experimental observations are in agreement with expectations of the classical theory extended to include the effect of the optical field. A dual control of the helical pitch is achieved including both the low-frequency electric field applied along the helix axis and the optical field orthogonal to it.

Pitch tuning induced by optical torque in heliconical cholesteric liquid crystals / Nava, G.; Ciciulla, F.; Iadlovska, O. S.; Lavrentovich, O. D.; Simoni, F.; Lucchetti, L.. - In: PHYSICAL REVIEW RESEARCH. - ISSN 2643-1564. - ELETTRONICO. - 1:(2019), pp. 033215-1-033215-5. [10.1103/PhysRevResearch.1.033215]

Pitch tuning induced by optical torque in heliconical cholesteric liquid crystals

G. Nava
Primo
Membro del Collaboration Group
;
F. Ciciulla
Secondo
Membro del Collaboration Group
;
F. Simoni
Penultimo
;
L. Lucchetti
Ultimo
2019-01-01

Abstract

Heliconical cholesteric liquid crystals are expected to be more sensitive to torque induced by light field since their structure allows both bend and twist in molecular orientations, differently from the conventional cholesterics in which only twist deformation is involved, requiring much higher fields. We report here a demonstration of tuning the helical pitch in heliconical cholesterics induced by an optical torque. Experimental observations are in agreement with expectations of the classical theory extended to include the effect of the optical field. A dual control of the helical pitch is achieved including both the low-frequency electric field applied along the helix axis and the optical field orthogonal to it.
2019
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/272997
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