Behavior of planar multilayer periodic structures due to plane wave excitation has been studied using the transfer matrix method. Multilayer structure is taken with periodicity two. That is, layers at even and odd locations repeat themselves. Layers
at odd locations are of chiral nihility metamaterial whereas three different cases for layers at even locations are considered, i.e., dielectric, chiral and chiral nihility. Effects of polarization rotation due to the optical activity is studied with respect to the angle of incidence and frequency in terahertz domain. Chiral nihility introduces property of transparency to the structure for normal incidence while complete rejection is observed for chiral nihility-chiral nihility structure at oblique incidence.
Focusing of electromagnetic plane wave from a large size paraboloidal reflector, composed of layers of chiral and/or chiral nihility metamaterials, has been studied us- ing Maslovs method. First, the transmission and reflection of electromagnetic pla
ne wave from two parallel layers of chiral and/or chiral nihility metamaterials are cal- culated using transfer matrix method. The effects of change of angle of incidence, chirality parameters and impedances of layers are noted and discussed. Special cases by taking very large and small values of permittivity of second layer, while assuming value of corresponding chirality equal to zero, are also treated. These special cases are equivalent to reflection from a perfect electric conductor backed chiral layer and nihility backed chiral layer, respectively. Results of reflection from parallel layers have been utilized to study focusing from a large size paraboloidal reflector. The present study, on focusing from a paraboloidal re{deg}ector, not only unifies several published works conducted by different researchers but also provides better understanding of new cases.
