Theory of superfluorescence-laser crossover in a cavity QED system
Theory of superfluorescence-laser crossover in a cavity QED system
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腔 QED 系统中的超荧光-激光交叉理论
DOI：
10.1007/s00339-017-1301-y
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
and Kiyoshi Kobayashi
中科院分区：
文献类型：
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作者：
Riku Sezaki;Akira Ishikawa;Kensuke Miyajima;and Kiyoshi Kobayashi
来自相干耦合偏振的光子的相干发射是由激光和超荧光产生的，但是从相干光源的应用角度来看，其机制仍然模糊，有待于在纳米光子学中充分探索。本文提出了一个全面的全量子理论来解释腔QED系统中由于受激辐射和自发辐射之间的竞争而引起的激光和超荧光之间的交叉。结果表明，在稳态发射的情况下，利用腔QED系统的品质因子，可以实现与激光不同的超荧光相干发射。特别是，由于超荧光的相干产生发生在一个较短的时间尺度在一个腔QED系统具有较低的Q因子比激光由于受激发射。这一结果表明，超荧光可以应用于一个新的相干光源的机制大大不同于激光。
Coherent emissions of photons, originating from coherently-coupled polarizations, are created by laser and superfluorescence, but the mechanisms remain obscure to be fully explored in nanophotonics from the application viewpoint to coherent-light sources. In this paper, we present a comprehensive full quantum theory to clarify the crossover between laser and superfluorescence caused by the competition between stimulated and spontaneous emissions in a cavity QED system. As a result, in case of steady-state emission, we show the feasibility of coherent-light emission by superfluorescence different from laser, depending on the quality factor of a cavity QED system. In particular, the coherence generation due to superfluorescence occurs in a shorter timescale in a cavity QED systems with a lower Q factor than laser due to stimulated emission. This result suggests that superfluorescence can be applied to a novel coherent-light source by a mechanism greatly different from laser.