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Open AccessArticle

A Low-Threshold Miniaturized Plasmonic Nanowire Laser with High-Reflectivity Metal Mirrors

1
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
2
School of Mechanical and Electric Engineering, Guangzhou University, Guangzhou 510006, China
3
Photonics Research Centre, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, China
4
ITMO University, Kronverkskiy pr. 49, 197101 St. Petersburg, Russia
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(10), 1928; https://doi.org/10.3390/nano10101928
Received: 4 September 2020 / Revised: 21 September 2020 / Accepted: 23 September 2020 / Published: 27 September 2020
(This article belongs to the Special Issue Advances in Photonic and Plasmonic Nanomaterials)
A reflectivity-enhanced hybrid plasmonic GaAs/AlGaAs core-shell nanowire laser is proposed and studied by 3D finite-difference time-domain simulations. The results demonstrate that by introducing thin metal mirrors at both ends, the end facet reflectivity of nanowire is increased by 30–140%, resulting in a much stronger optical feedback. Due to the enhanced interaction between the surface charge oscillation and light, the electric field intensity inside the dielectric gap layer increases, resulting in a much lower threshold gain. For a small diameter in the range of 100–150 nm, the threshold gain is significantly reduced to 60–80% that of nanowire without mirrors. Moreover, as the mode energy is mainly concentrated in the gap between the nanowire and metal substrate, the output power maintains >60% that of nanowire without mirrors in the diameter range of 100–150 nm. The low-threshold miniaturized plasmonic nanowire laser with simple processing technology is promising for low-consumption ultra-compact optoelectronic integrated circuits and on-chip communications. View Full-Text
Keywords: plasmonic nanowire laser; reflectivity-enhanced; nanolaser; GaAs plasmonic nanowire laser; reflectivity-enhanced; nanolaser; GaAs
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MDPI and ACS Style

Zheng, J.; Yan, X.; Wei, W.; Wu, C.; Sibirev, N.; Zhang, X.; Ren, X. A Low-Threshold Miniaturized Plasmonic Nanowire Laser with High-Reflectivity Metal Mirrors. Nanomaterials 2020, 10, 1928.

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