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A study of two-photon florescence in metallic nanoshells

机译：金属纳米型中两光核浮动研究

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A theory of the two-photon florescence for a metallic nanoshell in the presence of quantum emitters has been developed. The metallic nanoshell is made of a metallic nanosphere as a core and a dielectric material as a shell. An ensemble of quantum emitters is deposited on the surface of the dielectric shell. A probe field is applied to study the two-photon process in the metallic nanoshell. Surface plasmon polaritons are created at the interface between the core and shell due to coupling between probe photons and surface plasmons present at the surface of the metallic nanosphere. The intensity of the surface plasmon polariton field is huge when the probe photon energy is in resonance with the polariton resonance energy. Induced electric dipoles are created in each quantum emitter due to the surface plasmon polariton field and the probe field. Dipoles in quantum emitters interact with each other via the dipole-dipole interaction. The dipole-dipole interaction is calculated using the many-body theory and mean field approximation. It is found that the dipole-dipole interaction has new term which is induced by the surface plasmon polariton field. An analytical expression of the two-photon florescence is derived in the presence the dipole-dipole interaction. Our theory predicts that the intensity of the two-photon florescence is enhanced in the presence of quantum emitters relative to the florescence of the metallic nanoshell in isolation. Physics behind the enhancement is the presence of the dipole-dipole interaction between the ensemble of quantum emitters. It is also found that as the concentration of quantum emitters increases, the dipole-dipole field also increases. This in turn, increases the two-photon florescence as function of the concentration. Finally, we have compared our theory with experiments of a metallic nanoshell which is made for Au nanosphere core and the SiO2 shell. The metallic nanoshell is surrounded by various concentrations of Cadmium-Selenium quantum dots as quantum emitters. A good agreement between theory and experiment is found.
机译：已经开发了在量子发射器存在下金属纳米孔的两光节繁殖的理论。金属纳米壳由金属纳米作为芯和作为壳体的介电材料制成。量子发射器的集合沉积在介电壳的表面上。应用探针领域以研究金属纳米孔中的双光子过程。由于在金属纳米层表面存在于金属纳米层的表面之间的耦合和壳体之间的耦合，在核心和外壳之间的界面处产生表面等离子体极性恒星。当探头光子能量与极性谐振谐振能量谐振时，表面等离子体极性磁体场的强度是巨大的。由于表面等离子体Polariton场和探针场，在每个量子发射器中创建了诱导的电偶极子。量子发射器中的偶极子通过偶极偶极相互作用相互作用。使用多体理论和平均场近似来计算偶极偶极交互。发现偶极 - 偶极相互作用具有由表面等离子体偏热场诱导的新术语。在偶极 - 偶极相互作用存在下，衍生双光子荧光的分析表达。我们的理论预测，在量子发射器的存在相对于金属纳米孔的荧光的存在下，在量子发射器的存在下，增强了双光子繁殖的强度。物理后面的增强是在量子发射器的集合之间存在偶极偶极相互作用的存在。还发现，随着量子发射器的浓度增加，偶极偶极场也增加。这反过来，随着浓度的函数增加了两光眼繁殖。最后，我们将我们的理论与金属纳米孔的实验进行了比较，该实验是针对Au纳米核心和SiO2壳体制成的。金属纳米壳包围着各种浓度的镉 - 硒量子点作为量子发射器。发现理论与实验之间的良好一致性。

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