Cavity-free plasmonic nanolasing enabled by dispersionless stopped light.
Cavity-free plasmonic nanolasing enabled by dispersionless stopped light.
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DOI：
10.1038/ncomms5972
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发表时间：
2014-09-17
影响因子：
16.6
通讯作者：
Hess, Ortwin
中科院分区：
文献类型：
--
作者：
Pickering, Tim;Hamm, Joachim M.;Page, A. Freddie;Wuestner, Sebastian;Hess, Ortwin
当光处于静止状态时，由于光态密度的奇异性，它与增益介质的相互作用急剧增加。同时，停止光产生一种固有的无腔反馈机制，类似于在大规模无序介质和随机激光中被证明和利用的反馈机制。本文研究了近红外频率下平面增益增强纳米等离子体结构中激光的空间、时间和光谱特征，并表明停光反馈机制允许无腔的纳米激光。我们发现，在没有腔诱导反馈的情况下，亚波长激光模式动态形成为准无色散波导模式的锁相叠加。该机制对界面粗糙度具有显著的鲁棒性，为纳米化、超薄表面发射激光器的实验实现和无腔主动量子等离子体提供了新的途径。停光原理产生了一种内在的光反馈机制。Pickering等人研究了这种局部反馈在增益增强等离子体纳米结构中的意义，并发现在纳米尺度上自然出现了超快光子和等离子体无腔激光。
When light is brought to a standstill, its interaction with gain media increases dramatically due to a singularity in the density of optical states. Concurrently, stopped light engenders an inherent and cavity-free feedback mechanism, similar in effect to the feedback that has been demonstrated and exploited in large-scale disordered media and random lasers. Here we study the spatial, temporal and spectral signatures of lasing in planar gain-enhanced nanoplasmonic structures at near-infrared frequencies and show that the stopped-light feedback mechanism allows for nanolasing without a cavity. We reveal that in the absence of cavity-induced feedback, the subwavelength lasing mode forms dynamically as a phase-locked superposition of quasi dispersion-free waveguide modes. This mechanism proves remarkably robust against interface roughness and offers a new route towards nanolasing, the experimental realization of ultra-thin surface emitting lasers, and cavity-free active quantum plasmonics. The stopped light principle engenders an inherent feedback mechanism for light. Pickering et al. study the implications of this local feedback in gain-enhanced plasmonic nanostructures and find the natural emergence of ultrafast photonic and plasmonic cavity-free lasing on the nanoscale.
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