We study the quantum-mechanical effects arising in a single semiconductor core/shell quantum dot (QD) controllably sandwiched between two plasmonic nanorods. Control over the position and the “sandwich” confinement structure is achieved by the use of a linear-trap liquid crystal (LC) line defect and laser tweezers that “push” the sandwich together. This arrangement allows for the study of exciton–plasmon interactions in a single structure, unaltered by ensemble effects or the complexity of dielectric interfaces. We demonstrate the effect of plasmonic confinement on the photon antibunching behavior of the QD and its luminescence lifetime. The QD behaves as a single emitter when nanorods are far away from the QD but shows possible multiexciton emission and a significantly decreased lifetime when tightly confined in a plasmonic “sandwich”. These findings demonstrate that LC defects, combined with laser tweezers, enable a versatile platform to study plasmonic coupling phenomena in a nanoscale laboratory, where all elements can be arranged almost at will.

中文翻译：

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调谐和切换向列线缺陷中的等离子量子点“三明治”

我们研究了可控地夹在两个等离激元纳米棒之间的单个半导体核/壳量子点（QD）中产生的量子力学效应。通过使用线性陷阱液晶（LC）线缺陷和将镊子“推”在一起的激光镊子，可以控制位置和“三明治”约束结构。这种安排允许在单个结构中研究激子-等离子体激元的相互作用，而不会受到整体效应或介电界面复杂性的影响。我们证明了等离子体限制对量子点的光子反聚束行为及其发光寿命的影响。当纳米棒远离QD时，QD表现为单个发射器，但当紧密限制在等离子“三明治”中时，则显示出可能的多激子发射，并且寿命显着降低。