Figure 2

Axial forces in a pair of resonators.

(a), Schematic of the resonators. is the external magnetic field density. d is the distance between the resonators. C₁ and C₂ are the capacitances in the resonators and F_x is the axial force on the first resonator. (b), Attractive forces as obtained by two identical resonators. The plot shows the axial force F_x on the first resonator depending on frequency f and distance d. The color corresponds to the force in arbitrary units. Only attractive forces are obtained. The resonance frequency shift towards lower frequencies is larger when the distance between resonators is smaller. (c), Attractive (red-yellow area) and repulsive (blue) forces are obtained for resonators with two different capacitors. F_x depends on the frequency f and distance d for different resonators. Both attractive (red-yellow area) and repulsive (blue) forces can now be obtained.