标题： 双共振超材料中二次谐波的增强 显示英文标题

标题： Enhancement of second harmonic generation in a doubly resonant metamaterial

摘要： 我们研究双共振超材料中的二次谐波（SH）生成。 我们表明，当二次谐波频率以及基频的共振条件都满足时，可以增强SH生成。 双共振超材料的一个单元由两个耦合的谐振器组成，其中一个在基频下共振，而另一个则在二次谐波频率附近共振。 我们观察到，双共振超材料中的SH生成是单共振超材料的4.6倍。 显示英文摘要

摘要： We investigate second harmonic (SH) generation in a doubly resonant metamaterial. We show that SH generation can be enhanced when the resonant condition is satisfied for the SH frequency as well as for the fundamental frequency. A unit cell of the doubly resonant metamaterial consists of two coupled resonators, one of which resonates at the fundamental frequency, whereas the other resonates around the SH frequency. We observe that the SH generation in the doubly resonant metamaterial is 4.6 times as large as that in a singly resonant metamaterial.