Mode Cooperation in a Two-Dimensional Plasmonic Distributed-Feedback Laser,ACS Photonics

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Mode Cooperation in a Two-Dimensional Plasmonic Distributed-Feedback Laser
ACS Photonics ( IF 6.5 ) Pub Date : 2018-07-05 00:00:00 , DOI: 10.1021/acsphotonics.8b00265
Nikita E. Nefedkin _{1,

2,

3} , Alexander A. Zyablovsky _{1,

2} , Evgeny S. Andrianov _{1,

2} , Alexander A. Pukhov _{1,

2,

3} , Alexey P. Vinogradov _{1,

2,

3}

Affiliation

Plasmonic distributed-feedback lasers based on a two-dimensional periodic array of metallic nanostructures are the main candidate for nanoscale sources of coherent electromagnetic field. In this work we show that, when the pumping spot is smaller than the size of the laser, the nonlinear interaction between the modes of a periodic plasmonic structure via the active medium leads to a new effect, namely, mode cooperation. Mode cooperation is manifested as the lasing of the bright modes in the allowed band with a high generation threshold instead of the dark modes at the edge of the band gap with a low generation threshold. This effect is inherent for two-dimensional distributed-feedback lasers and does not appear in one-dimensional lasers. Mode cooperation arises due to nonorthogonality of the laser modes in the pumped area where the bright modes become synchronized by the phase and their amplitudes interfere constructively. We demonstrate that mode cooperation results in broadening of the radiation pattern above the generation threshold, which has been observed in recent experiments. The obtained results provide new possibilities for effective control and manipulation of the radiation pattern of nanoscale systems.

中文翻译：

二维等离子分布反馈激光器中的模式合作

基于金属纳米结构的二维周期性阵列的等离子分布反馈激光器是相干电磁场纳米级源的主要候选者。在这项工作中，我们表明，当泵浦光斑小于激光器的尺寸时，周期性等离激元结构的模之间通过活性介质的非线性相互作用会产生新的效应，即模合作。模式协作表现为在具有高生成阈值的允许频带中发射亮模式，而不是在具有低生成阈值的带隙边缘发射暗模式。此效应对于二维分布式反馈激光器是固有的，在一维激光器中不会出现。由于在泵浦区域中激光模式的非正交性而导致模式协作，在这些区域中，亮模式已被相位同步，并且它们的振幅产生相长干涉。我们证明模式合作会导致辐射模式的扩展超过生成阈值，这在最近的实验中已经观察到。获得的结果为有效控制和操纵纳米级系统的辐射方向图提供了新的可能性。

更新日期：2018-07-05

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