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Low-Threshold Nanowire Laser Based on Composition-Symmetric Semiconductor Nanowires
journal contribution
posted on 2013-03-13, 00:00 authored by Pengfei Guo, Xiujuan Zhuang, Jinyou Xu, Qinglin Zhang, Wei Hu, Xiaoli Zhu, Xiaoxia Wang, Qiang Wan, Pengbin He, Hong Zhou, Anlian PanLow-threshold nanoscale lasers are
attractive for their promising
applications in highly integrated photonic devices and systems. Here
we report the controllable growth of composition-symmetric CdSxSe1–x nanowires
by using a multistep thermal evaporation route with moving sources.
Microstructure analyses reveal the obtained wires are high-quality
single crystals with the composition gradually changed from the center
toward their both ends. Under laser illumination, these wires exhibit
symmetrical color distribution along the length direction, with red
at the center and green at the both ends. Optically pumped lasing
is realized at room temperature using these composition-symmetric
nanowires, with the threshold several times lower than that of composition-homogeneous
wires. This new nanowire structure will have potential applications
as low-threshold nanoscale lasers in integrated nanophotonics.