论文标题
通过量子发射器增益增强的非线性等离子晶格中的第二次谐波生成
Second-harmonic generation in nonlinear plasmonic lattices enhanced by quantum emitter gain medium
论文作者
论文摘要
我们报告了在不一致的能量泵下与两级量子发射器（QE）相互作用的等离子纳米结构中第二次谐波生成（SHG）的理论研究。我们通过引入与QES结合并检查相应SPP-QE Polariton状态的物理性质的Anharmonic Surface Polariton（SPP）模式来概括驱动的Tavis-Cummings模型。我们对强量化QE-SPP耦合的SHG效率的计算表明，北极星增益促进了数量级的增强顺序。我们进一步讨论了SHG的时间域数值模拟，该平方晶格由Ag纳米圆柱组成，该纳米圆柱与QES耦合，利用完全矢量的非逆势非线性非线性流体动力学模型，用于导导电子与Maxwell-bloch方程的传导电子。这些模拟支持增强SHG的想法，并显示SHG效率的数量级提高，因为QE与晶格等离子模式共振，并通过不一致的泵带来了种群反转阈值。通过改变泵的频率和调整QE到局部等离子体模式，我们证明了强大的局部电场促进的SHG效率的进一步提高。检查了SHG的入射光极化依赖性，并与参与等离子体模式的对称性有关。
We report on theoretical study of second-harmonic generation (SHG) in plasmonic nanostructures interacting with two-level quantum emitters (QE) under incoherent energy pump. We generalize driven-dissipative Tavis-Cummings model by introducing anharmonic surface plasmon-polariton (SPP) mode coupled to QEs and examine physical properties of corresponding SPP-QE polariton states. Our calculations of the SHG efficiency for strong QE-SPP coupling demonstrate orders of magnitude enhancement facilitated by the polariton gain. We further discuss time-domain numerical simulations of SHG in a square lattice comprised of Ag nanopillars coupled to QEs utilizing fully vectorial nonperturbative nonlinear hydrodynamic model for conduction electrons coupled to Maxwell-Bloch equations for QEs. The simulations support the idea of gain enhanced SHG and show orders of magnitude increase in the SHG efficiency as the QEs are tuned in resonance with the lattice plasmon mode and brought above the population inversion threshold by incoherent pump. By varying pump frequency and tuning QEs to a localized plasmon mode, we demonstrate further enhancement of the SHG efficiency facilitated by strong local electric fields. The incident light polarization dependence of the SHG is examined and related to the symmetries of participating plasmon modes.
