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  • Title: Reversible photo-induced long-period fiber gratings in photonic liquid crystal fibers.
    Author: Liou JH, Chang TH, Lin T, Yu CP.
    Journal: Opt Express; 2011 Mar 28; 19(7):6756-61. PubMed ID: 21451702.
    Abstract:
    A novel light-controllable long-period fiber grating (LPFG) is demonstrated by making use of a PCF infiltrated with a photoresponsive liquid crystal (LC) mixture consisting of nematic LC molecules and light-sensitive 4-methoxyazobenzene (4MAB). With the aid of the photo-induced isomerization of 4MAB, the refractive index of the LC mixture can be modulated and the periodic index perturbation along the fiber can be achieved by exposing the PCF to a blue laser through a mask. The resonance wavelength and dip depth of the LPFG can be controlled by using different blue-laser irradiation time, numbers of period, and 4MAB concentrations. In addition, the photo-induced LPFG is erasable under green-laser illumination.
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