Investigation of near field effects on retrieval of electromagnetic properties of chiral metamaterials and coupling effects of nearby metamaterials

For accurate retrieval of electromagnetic properties of metamaterials (MMs), two subjects have been investigated throughout this thesis. The first subject involves a robust and accurate retrieval method for chiral MMs by taking into account the near-field effects which might be present around the borders of MMs due to high order Bloch modes. The second subject is about investigation of coupling phenomenon between nearby and adjacent MM slabs via considering substrate loss. Toward this end, to achieve investigated two subjects first the fundamental characteristics of chiral MMs are introduced. Then, classification of bi-isotropic media was described and the concept of chirality properties was clarified in detail. Next, the importance of near-field effects for chiral MMs was discussed. Moreover, the special properties of chiral MMs which are circular dichroism and optical activity were demonstrated. Furthermore, a new type of crescent-shaped chiral MM configuration was proposed in the framework of our analysis. In order to check the properties of crescent-shaped MM structure, different U-shaped and cross-shaped chiral configurations commonly utilized in the literature have been examined for comparison. On the other hand, to validate the coupling phenomenon between the resonating MM slabs, a conventional dielectric sample (polyethylene-nonresonant) was first considered. Then, the effect of distance between the resonating MM slabs and the effect of loss inside substrate on the strength of coupling effects were examined. Simulations were performed by CST Microwave Studio at X-band (8.12 - 12.4 GHz) to support our analysis.