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Reversible optical nonreciprocity in periodic structures with liquid crystals
7.J. Hwang, M. H. Song, B. Park, S. Nishimura, T. Toyooka, J. W. Wu, Y. Takanishi, K. Ishikawa, and H. Takezoe, Nature Mater. 4, 383 (2005).
19.Only elastic reorientation modes lying in the plane defined by the electric field and the wavevector of the incident light are considered within a plane wave description of the optical field. Therefore, the twist elastic constant is not involved in the equations of the model.
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We demonstrate how to achieve reversible nonreciprocal optical response in a periodic photonicstructure with a pair of defects, one of them being a nonlinear liquid crystaldefect layer. The twin defectstructure is symmetric at low intensity and becomes asymmetric above an intensity threshold that corresponds to the optical reordering of the liquid crystal. We show that nonreciprocal effects can be reversed by changing the wavelength as a consequence of the wavelength dependent light localization at the defect mode inside the structure.
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