Spaser操作低于阈值：自主与驱动Spaser
Spaser operation below threshold: autonomous vs. driven spasers
摘要：
在等离子体共振时，Spaser的金属纳米颗粒中的高焦耳损失导致其低Q因子。由于后者，为了实现相干等离子体激元的数量超过非相干等离子体激元的数量的spasing机制，可能需要不可持续的高泵浦速率。结果表明，在用外光波驱动的激光器进行损耗补偿的条件下，相干等离子体激元的数目急剧增加，量子噪声得到抑制。由于驱动波的损失的补偿甚至可以在接近spasing阈值时发生，所以相干等离子体激元的数量可以超过在可实现的泵浦速率下自发激发的等离子体激元的数量。
英文摘要：
At the plasmon resonance, high Joule losses in a metal nanoparticle of a spaser result in its low Q-factor. Due to the latter, to achieve the spasing regime, in which the number of coherent plasmons exceeds the number of incoherent plasmons, unsustainably high pump rates may be required. We show that under the condition of loss compensation by a spaser driven by an external optical wave, the number of coherent plasmons increases dramatically, and the quantum noise is suppressed. Since the compensation of losses of the driving wave may occur even near the spasing threshold, the number of coherent plasmons may exceed the number of spontaneously excited plasmons at achievable pump rates.
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