An electronic device can include a dielectric layer, and a graphene layer including a first surface located upon the dielectric layer. The electronic device can include a first electrode, a second electrode, and a third electrode each located upon the dielectric layer on a surface opposite the graphene layer. The first and second electrodes can be spaced apart along a longitudinal axis of the electronic device to define a first gap between the first and second electrodes, and the second and third electrodes are spaced apart along the longitudinal axis of the electronic device to define a second gap between the second and third electrodes. At least one of the first gap or the second gap can be angled so as to be neither parallel nor perpendicular to the longitudinal axis of the electronic device.