Hot electron injection induced electron–hole plasma lasing in a single microwire covered by large size Ag nanoparticles,CrystEngComm

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Hot electron injection induced electron–hole plasma lasing in a single microwire covered by large size Ag nanoparticles
CrystEngComm ( IF 2.6 ) Pub Date : 2020-05-19 , DOI: 10.1039/d0ce00640h
Peng Wan _{1,

2,

3,

4} , Mingming Jiang _{1,

2,

3,

4,

5} , Kai Tang _{1,

2,

3,

4} , Xiangbo Zhou _{1,

2,

3,

4} , Caixia Kan _{1,

2,

3,

4,

5}

Affiliation

In addition to the plasmon-mediated resonant coupling mechanism, plasmon-induced hot electron transfer can provide an alternative approach to construct high-performance optoelectronic devices for various applications, including photodetectors, photovoltaics, and molecular biology. In this work, a single Ga-doped ZnO microwire covered by large size (the diameter d ⋍ 200 nm) Ag nanoparticles (AgNP@ZnO:Ga MW) was prepared. Due to the excitation of hybrid quadrupole plasmons, ultraviolet whispering gallery mode lasing with a low threshold and significant enhancement of the optical output intensity was realized. Particularly, electron–hole plasma (EHP) lasing features, such as the redshift of the lasing band and the broadening of the spectral linewidth, could also be captured. This excellent phenomenon can be attributed to the hybrid quadrupole plasmon-induced generation and injection of hot electrons, resulting in bandgap renormalization due to the mismatch of the hybrid quadrupole plasmons and the ZnO:Ga excitons. The prompt hot electron generation and injection induced EHP-lasing characteristics can provide new possibilities for designing high-performance optoelectronic devices. More importantly, the proposed bandgap renormalization also enables the high-level engineering of the optoelectronic features by fine tuning the plasmonic behaviors.

中文翻译：

热电子注入在大尺寸Ag纳米颗粒覆盖的单根微丝中引起电子空穴等离子体激射

除了等离激元介导的共振耦合机制外，等离激元诱导的热电子转移还可以提供一种替代方法，以构建适用于各种应用的高性能光电器件，包括光电探测器，光电器件和分子生物学。在这项工作中，单根Ga掺杂的ZnO微线被大尺寸（直径d制备了约200 nm的Ag纳米颗粒（AgNP @ ZnO：Ga MW）。由于混合四极杆等离子体激元的激发，实现了低阈值和光学输出强度的显着提高的紫外回音廊模式激光。特别是，还可以捕获电子空穴等离子体（EHP）的激光特征，例如激光带的红移和光谱线宽的加宽。这种优异的现象可以归因于混合四极等离子体激元诱导的热电子的产生和注入，由于混合四极等离子体激元与ZnO：Ga激子的不匹配，导致带隙重归一化。迅速的热电子产生和注入诱导的EHP激光特性可以为设计高性能光电器件提供新的可能性。更重要的是，

更新日期：2020-07-06

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