Surface roughness effects on aluminium-based ultraviolet plasmonic nanolasers

Yi Cheng Chung, Pi Ju Cheng, Yu Hsun Chou, Bo Tsun Chou, Kuo Bin Hong, Jheng Hong Shih, Sheng Di Lin, Tien Chang Lu, Tzy Rong Lin

研究成果: Article同行評審

19 引文 斯高帕斯(Scopus)

摘要

We systematically investigate the effects of surface roughness on the characteristics of ultraviolet zinc oxide plasmonic nanolasers fabricated on aluminium films with two different degrees of surface roughness. We demonstrate that the effective dielectric functions of aluminium interfaces with distinct roughness can be analysed from reflectivity measurements. By considering the scattering losses, including Rayleigh scattering, electron scattering, and grain boundary scattering, we adopt the modified Drude-Lorentz model to describe the scattering effect caused by surface roughness and obtain the effective dielectric functions of different Al samples. The sample with higher surface roughness induces more electron scattering and light scattering for SPP modes, leading to a higher threshold gain for the plasmonic nanolaser. By considering the pumping efficiency, our theoretical analysis shows that diminishing the detrimental optical losses caused by the roughness of the metallic interface could effectively lower (∼33.1%) the pumping threshold of the plasmonic nanolasers, which is consistent with the experimental results.

原文English
文章編號39813
期刊Scientific reports
7
DOIs
出版狀態Published - 2017 一月 3

All Science Journal Classification (ASJC) codes

  • 多學科

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