Field-controlled topological metasurface Terahertz detector for 6G communications
XU Wenhao
SUN Zuoang
WANG Wenzhe
ZHANG Min
SONG Qi
Abstract：To enhance the performance of terahertz detectors,this study designed and fabricated a tera-hertz detection device based on an topological metasurface and an MnBi2Te4 thin film.The L-shaped subwavelength microstructures were fabricated using 3D printing technology,and the MnBi2Te4 thin layer was deposited via magnetron sputtering.By leveraging the topological surface state properties of MnBi2Te4 and the localized surface plasmon resonance effect of the L-shaped structure,strong localization of tera-hertz waves and efficient energy coupling were achieved.The device's performance in the 0.1 THz frequen-cy band was characterized experimentally:without external field,the responsivity(RA)reached 1.72 A/W,the noise-equivalent power(NEP)was as low as 8.23 pW/Hz1/2,and the detectivity(D*)peaked at 5.43×109 cm·Hz1/2/W.After applying an external magnetic field(0.145 mT)and laser(50 mW),the RA was maximally increased to 3.01 A/W,the NEP was reduced to 5.69 pW/Hz1/2,and the D* reached 7.85×109 cm·Hz1/2/W.The research indicates that the L-shaped topological structure and the enhancement effects of the magnetic/optical field can significantly optimize the photoelectric conversion efficiency and noise suppression capability of the detector,providing a new solution for high-performance terahertz detec-tion.
Keywords：Terahertz detectortopological metasurfaceMnBi2Te4 film
Publication Date：2026-08-25
Online Publishing Date：2026-08-28(First online date of this platform, not the publication date of the document)
Pages：9( 535-543 )