Journal
LAB ON A CHIP
Volume 12, Issue 19, Pages 3598-3610Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2lc40514h
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Funding
- EU Marie-Curie grant ALLOPLASM [FP7-PEOPLE-2010-IEF-273528]
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In this paper we review the state of the art in the field of liquid-crystal tunable guided-wave photonic devices, a unique type of fill-once, molecular-level actuated, optofluidic systems. These have recently attracted significant research interest as potential candidates for low-cost, highly functional photonic elements. We cover a full range of structures, which span from micromachined liquid-crystal on silicon devices to periodic structures and liquid-crystal infiltrated photonic crystal fibers, with focus on key-applications for photonics. Various approaches on the control of the LC molecular orientation are assessed, including electro-, thermo-and all-optical switching. Special attention is paid to practical issues regarding liquid-crystal infiltration, molecular alignment and actuation, low-power operation, as well as their integrability in chip-scale or fiber-based devices.
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