纳米带MIM隧道结中间隙等离子体激元的增强发光
Enhanced light emission from gap plasmons in nano-strip MIM tunnel junctions
摘要：
利用非弹性电子隧穿的电激发光是一种很有前途的方法，用于实现超紧凑的高调制带宽的片上光源。然而，这些纳米级光源的实际实现由于低的电子到光子转换效率而提出了挑战。在这里，我们研究的设计，增强光的产生和耦合输出在一个周期性的银-二氧化硅-银隧道结由于非弹性电子隧穿。与其他报道的结构相比，该结构具有制造过程简单的独特优势。通过有效地耦合的间隙等离子体激元模式和晶格共振，我们实现了共振增强的光学状态的局部密度高达三个数量级和增强的辐射效率的~0.53，30%以上的非耦合结构相比。
英文摘要：
Electrical excitation of light using inelastic electron tunneling is a promising approach for the realization of ultra-compact on-chip optical sources with high modulation bandwidth. However, the practical implementation of these nanoscale light sources presents a challenge due to the low electron-to-photon transduction efficiencies. Here, we investigate designs for the enhancement of light generation and out-coupling in a periodic Ag-SiO2-Ag tunnel junction due to inelastic electron tunneling. The structure presents a unique advantage of a simple fabrication procedure as compared to the other reported structures. By efficiently coupling the gap plasmon mode and the lattice resonance, we achieve a resonant enhancement in the local density of optical states up to three orders of magnitude and enhanced radiative efficiency of ~0.53, 30% higher as compared to the uncoupled structure.
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