Ultra-sensitive Dirac-point-based biosensing on terahertz metasurfaces comprising patterned graphene and perovskites

• DOI: 10.1364/prj.444225
• Publication Date: 2021-11-18T20:30:13Z
• Authors: Xin Yan; Tengteng Li; Guohong Ma; Ju Gao; Tongling Wang; Haiyun Yao; Maosheng Yang; Lanju Liang; Jing Li; Jie Li; Dequan Wei; Meng Wang; Yunxia Ye; Xiaoxian Song; Haiting Zhang; Chao Ma; Yunpeng Ren; Xudong Ren; Jianquan Yao
• Keywords: 02 engineering and technology; 0210 nano-technology

Biosensors are a focus of research on terahertz metasurfaces. However, reports ultra-sensitive biosensors based Dirac points rare. Here, new metasurface is proposed that consists patterned graphene and perovskites. This serves as an Dirac-point-based biosensor for qualitative detection sericin. Theoretically, sericin may make n-doped drive the Fermi level to shift from valence band point, causing dramatic decrease in conductivity. Correspondingly, dielectric environment undergoes significant change, which suited biosensing. In addition, metal halide perovskites, up-to-date optoelectronic materials, have positive effect phase during wave transmission. Thus, this sensor was used successfully detect with limit 780 pg/mL, achieved by changing amplitude phase. The much one order magnitude lower than sensors published works. These results show promising platform wide range biosensing biological sciences.