The enhancement of second harmonic generation with the double resonance

This paper presents a three-fold symmetry Nano-antenna, the nonlinear optical effects, such as the enhancement of the second harmonic generation, can be achieved by double resonance, and at the same time the polarization of the second harmonic wave can be effectively regulated and boosted, so that when the incident wave is a left-handed circularly polarized wave, the wave emitted at the second harmonic frequency is a right-handed circularly polarized wave; when the incident wave is a right-handed circularly polarized wave, the wave emitted at the second harmonic frequency is a left-handed circularly polarized wave..