A sensor device, method of fabricating the same, and a method of sensing a physical quantity. The sensor device comprises a substrate; a flexure member, one end of the flexure member being attached to the substrate, and a free end of the flexure member having an edge surface; a counter surface formed on the substrate such that the counter surface faces the edge surface of the flexure member and such that a separation distance between the counter surface and the edge surface remains substantially constant for movement of the edge surface as a result of flexure of the flexure member, each of the edge surface and the counter surface including one or more conductor layers disposed in a plane substantially perpendicular to a flexure direction of the flexure member; and means for applying an electrical potential difference between the conductors of the edge surface and the conductors of the counter surface for detecting a quantum tunnelling current therebetween.