Department of Electrical and Electronics Engineering, Kırklareli University, 39020 Karahıdır, Kırklareli, Turkey.
Nanoscale. 2013 Sep 21;5(18):8616-24. doi: 10.1039/c3nr02270f.
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, a coupled classical-quantum oscillators system. We show that the lifetime of the plasmonic oscillations can be increased several orders of magnitude, up to 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 the stimulated emission of radiation) experiment [Nature, 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.
我们研究了金属纳米粒子中的等离子体振荡在与量子发射器（例如量子点、分子）强耦合时的动力学。我们通过一个简单的模型，即耦合的经典-量子振荡器系统，模拟密度矩阵的演化。我们表明，等离子体振荡的寿命可以增加几个数量级，直到量子发射器的衰减时间。这种效应表现在表面等离激元放大的辐射受激辐射（spaser）实验中[Nature，2009，460，1110]，其中金纳米粒子与周围分子相互作用。等离子体激发寿命的增强使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。该效应可在许多纳米物理领域中得到应用，例如等离子体中的量子信息和提高太阳能电池效率。
