عنوان مقاله [English]
In this study, we consider a two-dimensional triangular lattice photonic crystal composed of liquid crystal infiltrated air holes in Si background. Then we investigate the band structure, equifrequency contours and the field intensity distribution for different values of structural parameters, using plane wave expansion and finite-difference time-domain methods. In the following, it is found that, for the optimum values if geometrical parameters the structure represents a similar behavior with a system with negative refractive index for a relatively wide frequency range. The negative refractive index causes that in a specified frequency width, the image of a light source is appeared perfectly in other side of the designed photonic crystal. At the end the effect of an external applied voltage on liquid crystals are studied. Our simulations reveal that applying the external electric filed change the refractive index of structure and can be used for tuning the negative refractive effect.
Keywords: Photonic crystal, negative refractive effect, plane wave method, finite-difference time-domain method.