Terahertz polarizer based on oriented vertical Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene nanosheets
발표자
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초록
내용
Two-dimensional titanium carbide, Ti3C2Tx MXene (Tx= O, OH and F), is recently attracting much attention for its metallic conductivity and high surface functional group density. Interestingly, MXene edge is theoretically predicted to show a huge difference in permittivity depending on the incident polarization direction in the long-wavelength range. Based on this, here, a terahertz (THz) polarizer based on vertical MXene nanosheets with comparable performance is presented. Application of an alternating-current electric field to MXene-dispered solution and subsequent freeze-drying fixation completes a thin and large-area vertical MXene film exhibiting anisotropic THz transmittance. The extinction ratio increases up to over 31 dB, which is much higher than the maximum of the previously reported MXene-based THz polarizer. In addition to the simple uniaxial arrangement, a radial pattern, which implements multi-polarizations in one sample, is developed in a designed electrode cell.