TCD spectral measurement biosensor based on linear polarization incidence

The utility model discloses a TCD spectral measurement biosensor based on linear polarization incidence, which comprises a terahertz wave refracting lens and a sub-wavelength metal sensing structure, the terahertz wave refracting lens is in a hemisphere shape, the sub-wavelength metal sensing structure is a metal plate, a plurality of grids are uniformly distributed on the metal plate, and the grids are connected with the terahertz wave refracting lens and the sub-wavelength metal sensing structure. The circular tangent plane of the terahertz wave refractor is arranged opposite to the grating of the sub-wavelength metal sensing structure, and a to-be-measured gap is formed between the terahertz wave refractor and the sub-wavelength metal sensing structure. The sensor is simple in structure, the testing method is convenient to operate, a locally-enhanced chiral terahertz electric field can be obtained in a sensing gap, the use amount of samples is reduced, the influence of water absorption in the samples is ov