標題: Surface roughness effects on aluminium-based ultraviolet plasmonic nanolasers
作者: Chung, Yi-Cheng
Cheng, Pi-Ju
Chou, Yu-Hsun
Chou, Bo-Tsun
Hong, Kuo-Bin
Shih, Jheng-Hong
Lin, Sheng-Di
Lu, Tien-Chang
Lin, Tzy-Rong
照明與能源光電研究所
電子工程學系及電子研究所
光電工程學系
Institute of Lighting and Energy Photonics
Department of Electronics Engineering and Institute of Electronics
Department of Photonics
公開日期: 3-一月-2017
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.
URI: http://dx.doi.org/10.1038/srep39813
http://hdl.handle.net/11536/132955
ISSN: 2045-2322
DOI: 10.1038/srep39813
期刊: SCIENTIFIC REPORTS
Volume: 7
顯示於類別:期刊論文