A transparent 90° polarization rotator by combining chirality and electromagnetic wave tunneling

Mutlu, Mehmet; Ozbay, Ekmel
January 2012
Applied Physics Letters;1/30/2012, Vol. 100 Issue 5, p051909
Academic Journal
A three-layer chiral metamaterial is constructed by using two layers of four mutually rotated resonators and a subwavelength mesh sandwiched symmetrically between these layers. The resulting structure is an ultrathin, transparent, and polarization angle independent 90° polarization rotator. Due to the electromagnetic tunneling effect exerted by the negative permittivity mesh, a cross-polarization conversion efficiency of 99% and 93% is achieved numerically and experimentally. The structure is modeled using the effective medium theory and then the transfer matrix method is applied to demonstrate the existence of the tunneling resonance theoretically.


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