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arXiv 2101.03571physics.opticscond-mat.mes-hall
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$Eu^{ 3+}$离子与双曲型超材料耦合的自发发射动力学

Spontaneous emission dynamics of $Eu^{ 3+}$ ions coupled to hyperbolic metamaterials

Gabriel I. López-Morales, Mingxing Li, Ravindra K. Yadav, Harshavardhan R. Kalluru, Jaydeep K. Basu, Carlos A. Meriles, Vinod M. Menon

摘要:

具有可调电磁特性的亚波长纳米结构系统,如双曲型超材料(HAMTS),为定制自发发射过程提供了一个有用的平台。在这里,我们研究了一个系统,包括$Eu^{ 3+}(NO_{3})_{3}6H_{2}O$纳米晶体上的HMM结构,其特征在于在多孔$Al_{2}O_{3}$矩阵的Ag-纳米线的六边形阵列。HMM偶联的$Eu^{ 3+}$离子表现出高达2.4倍的衰减速率的增加,伴随着$^{ 5}D_{0}\rightarrow$ $^{ 7}F_{2}$跃迁的发射速率的增强。使用时域有限差分建模,我们证实了这些观察与所看到的$Eu^{ 3+}$离子在HMM附近的光子态密度的增加。我们的研究结果表明,阻碍可以作为一个有价值的工具,以控制从弱跃迁的发射,因此暗示在纳米光电子学和量子器件的稀土离子的更实际的应用路线。

英文摘要:

Sub-wavelength nanostructured systems with tunable electromagnetic properties, such as hyperbolic metamaterials (HMMs), provide a useful platform to tailor spontaneous emission processes. Here, we investigate a system comprising $Eu^{ 3+}(NO_{3})_{3}6H_{2}O$ nanocrystals on an HMM structure featuring a hexagonal array of Ag-nanowires in a porous $Al_{2}O_{3}$ matrix. The HMM-coupled $Eu^{ 3+}$ ions exhibit up to a 2.4-fold increase of their decay rate, accompanied by an enhancement of the emission rate of the $^{ 5}D_{0}\rightarrow$ $^{ 7}F_{2}$ transition. Using finite-difference time-domain modeling, we corroborate these observations with the increase in the photonic density of states seen by the $Eu^{ 3+}$ ions in the proximity of the HMM. Our results indicate HMMs can serve as a valuable tool to control the emission from weak transitions, and hence hint at a route towards more practical applications of rare-earth ions in nanoscale optoelectronics and quantum devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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