Investigation of electromagnetic properties of chi̇ral metamateri̇als

Theoretical and numerical investigation of the chiral slab exhibiting polarization rotation is presented in detail. The chirality, thickness of medium, dielectric constant, and incident angle are analyzed both for TE and TM incident waves. The chiral slab then is realized by using full wave EM simulation software in order to validate the numeric results in which the numerical and simulation results are in good agreement with each other. Alternatively, the proposed model shows optimum results for wide frequency band by using small chirality which is sufficient for polarization rotation. It is observed that the proposed system and its realization can be effectively used as a polarization converter and EM filters at some frequencies. We demonstrated numerically and experimentally a dynamical chiral metamaterial that uniaxially creates giant optic activity and circular dichroism. Also, the structure gives high negative refractive index due to the large chirality. The proposed chiral metamaterial includes four L attached cross (FLAC) wire strips. The experimental results are in good agreement with the numeric results and simulation. It can be seen that FLAC wire strips based chiral metamaterial can also be used to achieve natural-small chirality with constant value in a wide frequency range between 3.5-4.5 GHz. This is also another crucial feature of the structure. So, the proposed chiral metamaterial with constant chirality value can be used to design novel EM devices such as polarization converter, anti-reflection filters for a certain frequency range.