基于磁偶极子共振的石墨烯传感器

Magnetic Dipole Resonance-Based Graphene Sensor

设计一种开口谐振环超表面与太赫兹波相结合的石墨烯传感器,实现对不同物质更加灵敏的痕量检测。当谐振环的对称性被破坏后,电偶极子和磁偶极子之间产生干涉现象,从而形成了透明窗口,并根据多极子散射功率进一步说明谐振点处的共振机理。超表面与石墨烯的结合,可以实现对吡虫啉杀虫剂的低浓度检测,其检测限为1.725 fg/ml。这种超灵敏检测是通过介电环境发生细微变化时,石墨烯的费米能级会移动到狄拉克点来实现的。该方法在实现低浓度农药检测方面具有重大意义。

Design a graphene sensor combining an open resonant ring metasurface with terahertz waves,more sensitive trace detection of different substances is achieved.When the symmetry of the resonant ring is broken,an interference phenomenon occurs between the electric dipole and the magnetic dipole,thereby forming a transparent window,and the resonance mechanism at the resonance point is further illustrated based on the multipole scattering power.The combination of metasurface and graphene enables the detection of imidacloprid insecticide at low concentrations with a detection limit of 1.725 fg/mL.This ultra-sensitive detection is achieved by the Fermi level of graphene moving to the Dirac point when there is a small change in the dielectric environment.The method is of great importance in enabling the detection of low concentrations of pesticides.