论文标题
使用石墨烯和石墨烯纳米容器在稀土上增强两光子自发发射
Enhancing two-photon spontaneous emission in rare earths using graphene and graphene nanoribbons
论文作者
论文摘要
通过有限差差时域模拟和稀有地球中能量水平之间的直接计算的直接计算，计算了可实现的实验条件，从而计算了可实现的实验条件，从而计算出三价自发发射（2pse）的两光自发发射（2PSE）。对于ER $^{3+} $，我们发现2PSE速率最初比单光子自发排放率低8个订单，但是随着增强，2PSE可以达到总衰减的2.5％。当使用石墨烯纳米纤维时，我们还表明，通过2PSE从3-3.2 $μ$ m中从ER $^{3+} $中的自由空间光子对发射可以增加$ \ sim 400 $。我们的计算显示，相对的石墨烯增强的2PSE明显少于以前的作品，我们将这种变化归因于发射极大小和假定的石墨烯迁移率的差异。我们还表明，离子的内部能量结构可以对可实现的2PSE增强程度产生影响，并发现二价稀土更有利。
The enhancement of two-photon spontaneous emission (2PSE) from trivalent and divalent rare earth ions in proximity to graphene and graphene nanoribbons is calculated for achievable experimental conditions using a combination of finite difference time domain simulations and direct computation of transition rates between energy levels in rare earths. For Er$^{3+}$, we find that the 2PSE rate is initially 8 orders lower than the single-photon spontaneous emission rate but that, with enhancement, 2PSE can reach 2.5% of the overall decay. When graphene nanoribbons are used, we also show that the emission of free-space photon pairs from Er$^{3+}$ at 3 - 3.2 $μ$m via 2PSE can be increased by $\sim 400$. Our calculations show significantly less relative graphene-enhanced 2PSE than previous works, and we attribute this variation to differences in emitter size and assumed graphene mobility. We also show that the internal energy structure of the ion can have an impact on degree of 2PSE enhancement achievable and find that divalent rare earths are more favorable.
