银光栅-薄膜几何结构中的等离子体激元激光和脉冲行为
Simultaneously plasmon lasing and spasing behavior in a silver grating-film geometry
摘要：
利用自洽的Maxwell-Bloch方法，我们证明了简单金属光栅薄膜纳米结构中同时存在的激光和脉冲行为，这可以归因于空间烧孔以及带边和等离子体带隙中不同模式的增益竞争.我们展示了三种模式：一种是品质因数高达248.54的间隙Spaser模，一种是从光栅表面垂直发射的带边等离子体激元激光模，另一种是被Spaser模抑制的带边等离子体激元激光模。该方法在低阈值相干光源、表面等离子体激元光源、表面增强拉曼散射、固体发光等方面具有重要的应用价值。
英文摘要：
By using a self-consistent Maxwell-Bloch method, we demonstrate the simultaneously lasing and spasing behavior in a simple metal grating-film nanostructure, which can be attributed to spatial hole burning and the gain competition of different modes at the band edge and in the plasmonic band gap. We show three modes: one spaser mode in gap with quality factor as high as 248.54, one plasmon lasing mode at band edge which emit vertically from the grating surface, and the other plasmon lasing mode at band edge which is suppressed by the spaser mode. This method may find significant applications in coherent light and surface plasmon sources with low threshold, surface enhanced Raman scattering, solid-state lighting emission, etc.
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