Topological insulators represent a new quantum phase of matter with spin-polarized surface states that are pro-tected from backscattering,exhibiting electronic responses to light,such as topological quantum phase transi-tions.However,the effects of high-frequency driving topological intrinsic systems have remained largely unexplored challenges experimentally for high-sensitivity terahertz detection.In this study,by integrating Sb2Te3 topological insulators with subwavelength metal antennas through micro-nano processing,a high-frequency terahertz detector with high sensitivity is proposed.The enhanced response originates from the asymmetric scattering of the surface electrons in the Sb2Te3 flakes induced by the terahertz wave.The device displays room-temperature photodetection with a responsivity of 192 mA/W and equivalent noise power of less than 0.35 nW/Hz1/2 in the frequency range from 0.02 to 0.3 THz.These results pave the way for the ex-ploitation of topological insulators for high-frequency operation in real-time imaging within long-wavelength optoelectronics.

SHI ZHANG;CHAOFAN SHI;WEIWEI TANG;LIBO ZHANG;LI HAN;CHENGSEN YANG;ZHENGYANG ZHANG;JIAN WANG;MIAO CAI;GUANHAI LI;CHANGLONG LIU;LIN WANG;XIAOSHUANG CHEN;WEI LU

College of Physics and Optoelectronic Engineering,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China;State Key Laboratory of Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China;Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Department of Optoelectronic Science and Engineering,Donghua University,Shanghai 201620,China;Terahertz Technology Innovation Research Institute,Shanghai Key Laboratory of Modern Optical System,University of Shanghai for Science and Technology,Shanghai 200093,China

光子学研究（英文）

[1]SHI ZHANG;CHAOFAN SHI;WEIWEI TANG;LIBO ZHANG;LI HAN;CHENGSEN YANG;ZHENGYANG ZHANG;JIAN WANG;MIAO CAI;GUANHAI LI;CHANGLONG LIU;LIN WANG;XIAOSHUANG CHEN;WEI LU-.High-frequency enhanced response based on Sb2Te3 topological insulators)[J].光子学研究（英文）,2022(10):2302-2308

ploitation

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