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Modeling of dielectric function in plasmonic quantum dot nanolaser

机译：等离子体量子点纳米激光中介电函数的建模

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摘要

In this work we present a model of the dielectric function in plasmonic quantum dot (QD) nanolaser. A metal/semiconductor/metal structure was considered to attain plasmonic nanocavity with active region containing: QD, wetting layer and barrier. The dielectric function was calculated for both metal (Ag) and QD structure. The propagation constant of surface plasmon polariton (SPP) at the interface of Ag/InAs-QD structure was calculated and the dispersion relation of the plasmonic QD structure was evaluated. For frequencies far from plasma one, the gap between real and imaginary parts was large and a deviation from linear relation was obvious. The SPP field was strongly localized at the interface due to the effect of zero-dimensional QD structure which has application in the super-resolution and best sensitivity in optical imaging. Results of propagation length of SPP (Lspp) also support this. According to the Lspp results, the damping in the SPP energy was low in the Ag/InAs-QD compared to that in the Ag/air interface. The obtained results are in the range of experimental ones.
机译：在这项工作中，我们提出了等离子量子点（QD）纳米激光中介电功能的模型。金属/半导体/金属结构被认为具有具有包含：QD，润湿层和阻挡层的活性区域的等离子体纳米腔。计算了金属（Ag）和QD结构的介电常数。计算了Ag / InAs-QD结构界面处的表面等离子体激元（SPP）的传播常数，并评价了等离子体QD结构的色散关系。对于远离等离子体一的频率，实部和虚部之间的间隙较大，并且与线性关系的偏差很明显。由于零维QD结构的影响，SPP场强烈地位于界面处，该结构在光学成像中具有超分辨率和最佳灵敏度。 SPP的传播长度（Lspp）的结果也支持这一点。根据Lspp结果，与Ag /空气界面相比，Ag / InAs-QD中SPP能量的阻尼较低。所得结果在实验范围内。

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