Enhanced light emission from gap plasmons in nano-strip MIM tunnel junctions

Kishen, Saurabh and Tapar, Jinal and Emani, Naresh Kumar (2020) Enhanced light emission from gap plasmons in nano-strip MIM tunnel junctions. Journal of Optics, 22 (9). ISSN 2040-8978

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Abstract

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. We achieve a resonant enhancement in the local density of optical states up to three orders of magnitude over vacuum for the periodic metal-insulator-metal tunnel junction. By efficiently coupling the gap plasmon mode and the lattice resonance, an enhanced radiative efficiency of ∼0.53 was observed, 30% higher as compared to the uncoupled structure. © 2020 IOP Publishing Ltd.

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