We demonstrate second harmonic generation by using an amorphous silicon metamaterial fabricated on the tip of an optical fiber that collects the generated light. The metamaterial is a double-chevron array that supports a closed-mode resonance for the fundamental wavelength at 1510 nm with a quality factor of 30. The normalized resonant second harmonic conversion efficiency calculated per intensity and square of interaction length is ∼10⁻¹¹ W⁻¹, which exceeds the previously achieved value for a silicon metamaterial by two orders of magnitude.

中文翻译：

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非晶硅硅超材料中的二次谐波产生

我们通过使用在收集产生的光的光纤尖端制造的非晶硅超材料演示了二次谐波的产生。超材料是双雪佛龙阵列，支持1510 nm基本波长的封闭模式共振，品质因数为30。按强度和相互作用长度的平方计算得出的归一化共振二次谐波转换效率约为10 ^-11  W ^-1，比硅超材料先前达到的值高两个数量级。