Polarization Controlled Dual Resonant Tera-Hertz Transmission through Asymmetric Aperture Array

Resonant transmission of electromagnetic radiation through an array of rectangular apertures occurs when electric field vectors of the incident wave are perpendicular to the long axis of the aperture. In this paper, we conduct a study on periodic array of asymmetric aperture and demonstrate that introducing a taper along long axis can yield transmission for both orthogonal polarizations. Specifically, we show that, spectral peak position of transmission spectra can be tuned by just flipping the polarization from one state to its orthogonal state. Moreover, highly directive transmitted beam results at far field as the inter-element spacing of the aperture is reduced to half of the wavelength at resonance.