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    Title: Efficient tunable negative refraction photonic crystal achieved by an elliptic rod lattice with a nematic liquid crystal
    Authors: Liu, Cheng-Yang;Zhang, Nai-Wen;Wang, Hung-Wen;Chen, Lien-Wen
    Contributors: 淡江大學機械與機電工程學系
    Keywords: Negative refraction;Elliptic rod;Liquid crystals
    Date: 2009-11
    Issue Date: 2013-07-09 15:31:32 (UTC+8)
    Publisher: Amsterdam: Elsevier BV * North-Holland
    Abstract: Photonic crystals (PCs) have many potential applications because of their ability to control light-wave propagation. We have investigated the electromagnetic wave propagation inside an elliptic rod PC slab by means of finite-difference time-domain simulations. The band structure of the PC composed of elliptic rod in the square and triangular lattices is studied by solving Maxwell's equations using the plane wave expansion method. Numerical simulations show that the refractive angle can be tuned greatly by rotating the directors of elliptic rod in the PC slab. Furthermore, an optical switch based on elliptic rod PC structures with nematic liquid crystals was proposed. In the on/off switching system, the partial band gap can be controlled when the normalized operation frequency is 0.28. The modulation induced by liquid crystals created a sharp switching in the photonic devices. Such a mechanism of negative refraction PCs should open up a new application for designing components in photonic integrated circuits.
    Relation: Physica B: Condensed Matter 404(21), pp.4060-4070
    DOI: 10.1016/j.physb.2009.07.163
    Appears in Collections:[機械與機電工程學系暨研究所] 期刊論文

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