Harmonic strain-optical response revealed in the isotropic (liquid) phase of liquid crystals | Zendy

Philipp Kahl | Zendy; Patrick Baroni | Zendy; Laurence Noirez | Zendy

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Harmonic strain-optical response revealed in the isotropic (liquid) phase of liquid crystals

Author(s) -

Philipp Kahl,

Patrick Baroni,

Laurence Noirez

Publication year - 2015

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4929321

Subject(s) - birefringence , liquid crystal , isotropy , materials science , amplitude , phase (matter) , optics , phase transition , condensed matter physics , optoelectronics , physics , quantum mechanics

International audienceA strong optical birefringence is observed when applying a small amplitude oscillatory strain to theliquid phase of a liquid crystal. This unpredicted birefringence is found to oscillate at the samefrequency as the driving frequency, with frequencies down to 0.01 Hz. This birefringence is visibleup to 15 C above the liquid crystal transition. This opto-dynamic property is interpreted as a resultof a coupling of the orientational pretransitional fluctuations existing in the isotropic phase andlong range elastic interactions recently identified in liquids. The conversion of the mechanicalwave in an optical response is shapeable. Two examples of synchronized periodic signals areshown: the sine and the square waves. The optimization of the signal is analyzed using aHeaviside-step shear test. This optical property is immediately exploitable to design low energyon/off switching material

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