Fast novel nonlinear optical NLC system with local response

Photorefractive Photonics 2017

Iljin, Andrey^1 ; Residori, Stefania^2 ; Bortolozzo, Umberto^2

Institute of Physics, NAS of Ukraine, Prospect Nauki 46, Kyiv

03028, Ukraine^1

Institut de Physique de Nice, Université de Nice-Sophia Antipolis, CNRS, UMR7010, 1361 route des Lucioles, Valbonne

06560, France^2

关键词: Director reorientation;    Homeotropic alignment;    Liquid crystalline;    Non-linear optical;    Nonlinear optical response;    Optical nonlinearity;    Spatial resolution;    Volume holograms;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/867/1/012034/pdf
DOI  :  10.1088/1742-6596/867/1/012034

来源: IOP

【 摘 要 】

Nonlinear optical performance of a novel liquid crystalline (LC) cell has been studied in two-wave mixing experiments revealing high diffraction efficiency within extremely wide intensity range, fast recording times and spatial resolution. Photo-induced modulation of the LC order parameter resulting from trans-cis isomerisation of dye molecules causes consequent changes of refractive indices of the medium (Light-Induced Order Modification, LIOM-mechanism) and is proved to be the main mechanism of optical nonlinearity. The proposed arrangement of the electric-field-stabilised homeotropic alignment hinders the LC director reorientation, prevents appearance of surface effects and ensures the optical cell quality. The LIOM-type nonlinearity, characterised with the substantially local nonlinear optical response, could also be extended for the recording of arbitrary phase profiles as requested in several applications for light-beam manipulation, recording of dynamic volume holograms and photonic lattices.