| Abstract: | Electromagnetic coupling generates a second‐harmonic signal via the magnetic component of Lorentz force of free electrons. In this work, the enhancement of artificial second‐harmonic generation (SHG) from plasmonic metamaterial with near‐field electromagnetic coupling is theoretically investigated by performing numerical simulations in both frequency and time domains. Simulation results demonstrate that a small gap between the near‐field electric dipole and magnetic resonators could increase the electromagnetic coupling and the SHG signal. In addition, the longer the near‐field electric dipole resonator, the stronger the SHG signal emits. By tuning the geometrical parameters, it has been verified that near‐field electromagnetic coupling results in enhancement of magnetic resonance, thereby improving the SHG signal by more than 3.4 times. This research paves a way toward the design of artificial nonlinearity with metamaterials. |
