期刊
OPTICS EXPRESS
卷 23, 期 11, 页码 14010-14017出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.23.014010
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资金
- European Community's Seventh Framework Programme HIERARCHY [FP7-PEOPLE-1-1-ITN/ 215851-2]
- Netherlands Organisation for Scientific Research (NWO)
- Slovenian Research Agency (ARRS) [J1-6723]
Liquid crystals are superior optical materials for large area displays, but it is considered that their collective and slow-millisecond response makes them useless for ultrafast optical applications. In contrast to that, we here demonstrate an ultrafast optical response of a nematic liquid crystal, which is induced by an intense femtosecond optical impulse. We show that the refractive index of the nematic liquid crystal pentyl-cyanobiphenyl can be modulated at a time scale as fast as 500 fs via a coherently excited optical Kerr effect. The change in the refractive index is in the order of 10(-4) at a fluence of 4 mJ/cm(2) and is strongly polarization dependent. This unprecedented result opens new ways towards ultrafast all-optical modulation in liquid crystal-based devices. (C)2015 Optical Society of America
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