Optical Interferometry-Based Surface Stress Sensor Using Suspended Graphene

We demonstrated the diameter-dependence of surface stress response in graphene-based surface stress biosensor. Surface stress was induced to suspended graphene with a diameter of $\mathbf{6-10\ \mu m}$ by antigen-antibody reaction, and deflection of the suspended graphene was evaluated by optical interferometry. As a result, the deflection of each diameter is 69 nm, 100 nm and 145 nm, respectively.