Abstract
A terahertz (THz) in-line polarization converter that yields a polarization conversion ratio as high as 99.9% is demonstrated at 1 THz. It has double-layer slot structures oriented in orthogonal directions that are electrically connected by 1/8-wavelngth-long through-via holes beside the slot structures. The slots on the front metal-plane respond to the incident THz wave with polarization orthogonal to the slots and generates a circulating surface current around the slots. The surface current propagates along a pair of through-via holes that function as a two-wire transmission line. The propagating current generates a surface current around the backside slot structures oriented orthogonal to the slot structures on the front metal layer. The circulating current generates a terahertz wave polarized orthogonal to the backside slot structures and the 90° polarization conversion is completed. The re-radiating THz wave with 90° converted polarization propagates in the same direction as the incident THz wave.
Highlights
A terahertz (THz) in-line polarization converter that yields a polarization conversion ratio as high as 99.9% is demonstrated at 1 THz
Even though the THz wave generated by these methods is linearly polarized, it is necessary to control the polarization in a practical THz sensor and spectroscopy systems to enhance their sensitivity and resolution[11,12]
As many THz applications require a polarization converter to operate in a transmission mode, there is a need for an inline device with a higher polarization conversion ratio while maintaining the benefits of a reflectance-type metamaterial structure
Summary
A terahertz (THz) in-line polarization converter that yields a polarization conversion ratio as high as 99.9% is demonstrated at 1 THz. A metamaterial structure responds to a terahertz wave based on its geometric structure rather than material composition, and its thickness is typically on a subwavelength scale It manipulates and controls the electromagnetic wave in a range from microwave to THz frequencies. This paper demonstrates a highly efficient, inline polarization converter that operates in a THz frequency range and uses a three-dimensional metamaterial structure It rotates the polarization angle of an incident terahertz wave by 90° while maintaining a high polarization conversion ratio as well as the propagation direction. The polarization converter presented in this paper is based on double-layer shorted metallic apertures separated by a thin substrate It overcomes previously introduced limitations of bulk crystal and reflectance-type metamaterial devices and can readily be used in any THz system as an inline device. By electrically connecting two metallic slot apertures that receive and transmit orthogonally polarized waves, highly linear polarization conversion has been achieved
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