The invention discloses a
graphene terahertz metasurface sensor and application thereof in
pesticide residue detection, and relates to the technical field of sensors and detection. The
graphene terahertz metasurface sensor comprises a substrate, a metasurface layer, a
graphene film and an
aptamer layer. The invention further provides application of the graphene terahertz metasurface sensor in
pesticide residue detection. The metasurface layer is composed of the asymmetric
metal wire array, the metasurface layer is placed in a light path of a transmission-type THz time-domain
spectroscopy system, under the condition that the polarization direction of incident
waves is along the x axis, the structure can generate extremely strong local
electric field enhancement, and when the metasurface layer is used for detecting
pesticide molecules, the detection sensitivity is greatly improved. The interaction between
THz waves and pesticide molecules to be detected is obviously enhanced, so that the purpose of trace sensing of a target object is achieved. In addition, graphene is utilized and the metasurface of the
aptamer layer is modified, so that the detection sensitivity and specificity are improved.