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arXiv 1303.6594physics.optics
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在量子寿命内工作的金属纳米粒子等离子体激元

Metal nanoparticle plasmons operating within quantum lifetime

Mehmet Emre Tasgin

摘要:

我们研究了当金属纳米颗粒与量子发射体(例如量子点、分子)强耦合时,金属纳米颗粒上的等离子体激元振荡的动力学。我们模拟了一个简单模型:耦合经典-量子振子系统的密度矩阵演化。我们发现,等离子体激元振荡的寿命可以增加几个数量级,高达量子发射体的衰变时间。这种效应本身表现为spaser(通过辐射的受激发射的表面等离子体放大)实验中等离子体发射带的变窄[{ \it Nature},{ \bf 2009},460,1110],其中金纳米颗粒与周围分子相互作用。等离子体激元激发寿命的增加使得受激发射能够克服自发发射。这种增强是由于出现了类似于电磁感应透明(EIT)的现象。这种效应可以在纳米物理学的许多领域中找到应用,例如在等离子体激元的量子信息和提高太阳能电池效率中。

英文摘要:

We investigate the dynamics of a plasmonic oscillation over a metal nanoparticle when it is strongly coupled to a quantum emitter (e.g. quantum dot, molecule). We simulate the density matrix evolution for a simple model; coupled classical--quantum oscillators system. We show that lifetime of the plasmonic oscillations can be increased several orders of magnitude, upto the decay time of the quantum emitter. This effect shows itself as the narrowing of the plasmon emission band in the spaser (surface plasmon amplification by stimulated emission of radiation) experiment [{\it Nature}, {\bf 2009}, 460, 1110], where a gold nanoparticle interacts with the surrounding molecules. Enhancement of the plasmonic excitation lifetime enables stimulated emission to overcome the spontaneous one. The enhancement occurs due to the emergence of a phenomenon analogous to electromagnetically induced transparency (EIT). The effect can find applications in many areas of nanoscale physics, such as in quantum information with plasmons and in increasing solar cell efficiency.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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