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We report single and multiband linear polarizers for terahertz (THz) frequencies using cut-wire metamaterials (MM). The MMs are designed by finite element method, fabricated by electron beam lithography, and characterized by THz time-domain spectroscopy. The MM unit cells consist of single or multiple length cut-wire pads of gold on semi-insulating Gallium Arsenide for single or multiple band polarizers. The dependence of the resonance frequency of the single band polarizer on the length of the cutwires is explained based a transmission line model. Introduction:Linear polarizers are used to select light with electric field oscillations confined to a single plane. A combination of two polarizers can attenuate the light intensity in controlled fashion. In terahertz (THz) part of the electromagnetic spectrum, the commercially available devices for this purpose are wire grid polarizers (WGP) [1]. The WGPs can be free standing or grown on a substrate [2]. Linear polarizers were also reported using liquid crystals [3], aligned single wall carbon nano tubes [4], Brewster angle silicon wafers [5], aligned Nickel nano particles [6], etc. With the motivation of making the WGPs robust and inexpensive, recently some ideas are reported [7,8,9] and even more inexpensive options using gold color lines printed on a paper [10], Silver nano particle ink printer on a paper [11], graphite-lead grids on a sheet of paper [12], etc. were reported. All of these devices work for broad spectrum in THz. For a narrow pass band polarizer with better extinction coefficient, antireflection coating on the WGPs seems to be the option [2]. Other than this, there is no direct device for narrow single band or multiband polarization in the entire electromagnetic spectrum.
We report single and multiband linear polarizers for terahertz (THz) frequencies using cut-wire metamaterials (MM). The MMs are designed by finite element method, fabricated by electron beam lithography, and characterized by THz time-domain spectroscopy. The MM unit cells consist of single or multiple length cut-wire pads of gold on semi-insulating Gallium Arsenide for single or multiple band polarizers. The dependence of the resonance frequency of the single band polarizer on the length of the cutwires is explained based a transmission line model. Introduction:Linear polarizers are used to select light with electric field oscillations confined to a single plane. A combination of two polarizers can attenuate the light intensity in controlled fashion. In terahertz (THz) part of the electromagnetic spectrum, the commercially available devices for this purpose are wire grid polarizers (WGP) [1]. The WGPs can be free standing or grown on a substrate [2]. Linear polarizers were also reported using liquid crystals [3], aligned single wall carbon nano tubes [4], Brewster angle silicon wafers [5], aligned Nickel nano particles [6], etc. With the motivation of making the WGPs robust and inexpensive, recently some ideas are reported [7,8,9] and even more inexpensive options using gold color lines printed on a paper [10], Silver nano particle ink printer on a paper [11], graphite-lead grids on a sheet of paper [12], etc. were reported. All of these devices work for broad spectrum in THz. For a narrow pass band polarizer with better extinction coefficient, antireflection coating on the WGPs seems to be the option [2]. Other than this, there is no direct device for narrow single band or multiband polarization in the entire electromagnetic spectrum.
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