All-optical switching based on a tunable Fano-like resonance in nonlinear ferroelectric photonic crystals
All-optical switching based on a tunable Fano-like resonance in nonlinear ferroelectric photonic crystals
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DOI：
10.1088/2040-8978/15/8/085001
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发表时间：
2013-08
影响因子：
2.1
通讯作者：
Zhen Chai;Xiaoyong Hu;Q. Gong
中科院分区：
文献类型：
--
作者：
Zhen Chai;Xiaoyong Hu;Q. Gong
提出了一种基于多晶锂铁电二维非线性光子晶体中类Fano共振的低功耗全光开关。利用两个级联的非耦合光子晶体微腔，在透射谱中实现了非对称的类Fano线型。全光开关的物理机制是由于泵浦光引起的光子晶体结构色散关系的变化引起的类Fano共振峰的动态移动。在强度低至1 MW cm-2的弱泵浦光激发下，可达到61%的大开关效率。
A low-power all-optical switching is presented based on the all-optical tunable Fano-like resonance in a two-dimensional nonlinear ferroelectric photonic crystal made of polycrystalline lithium niobate. An asymmetric Fano-like line shape is achieved in the transmission spectrum by using two cascaded and uncoupled photonic crystal microcavities. The physical mechanism underlying the all-optical switching is attributed to the dynamic shift of the Fano-like resonance peak caused by variations in the dispersion relations of the photonic crystal structure induced by pump light. A large switching efficiency of 61% is reached under excitation of a weak pump light with an intensity as low as 1 MW cm−2.