An elastomer-based MEMS fabry-perot interferometer for physical and biological sensing by dry transfer technique

We developed an elastomer-based Fabry-Perot interferometer with 120-1080 nm gap between a freestanding thin film and a substrate using dry transfer technique. A newly developed elastomeric nanosheet using a polystyrene-polybutadiene-polystyrene triblock copolymer (SBS) provides low Young's modulus of 40 MPa, large elastic strain of 40%, and high adhesiveness. A freestanding SBS nanosheet can be formed by dry transfer technique without vacuum and high temperature processes owing to the high adhesiveness of SBS nanosheet. A minimum gap length of 120 nm with an 80 μm in diameter was achieved. With the pressure change, the freestanding membrane was found to deform with good adhesion between the dry transferred SBS and the substrate.