Double-sided grating waveguide biosensor

A double-sided grating waveguide biosensor for detecting one or a plurality of properties of a sample solution, the double-sided grating waveguide biosensor at least comprising:

• a plastic grating, wherein a surface of the plastic grating is provided with a grating part;
• a waveguide layer, located on the surface of the plastic grating, wherein a part of the waveguide layer is located on the grating part to form a double-sided grating structure, and the double-sided grating structure comprises two waveguide grating parts corresponding to each other;
• and
• a channel chip, located on the waveguide layer, being used to guide in the sample solution, wherein when a light beam is coupled into the waveguide layer via the double-sided grating structure and propagates along the waveguide layer, the double-sided waveguide biosensor detects the property of the sample solution via a variation of a light beam intensity of the light beam penetrating out of the waveguide layer.