Amplified spontaneous emission from single CdS nanoribbon with low symmetric cross sections.
Amplified spontaneous emission from single CdS nanoribbon with low symmetric cross sections.
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DOI：
10.1039/c2nr30980g
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发表时间：
2012-08
期刊：
影响因子：
6.7
通讯作者：
Xinlong Xu;Jian Xiong Wang;G. Jing;Z. Shen;B. Zou;H. Fan;M. Olivo
中科院分区：
文献类型：
--
作者：
Xinlong Xu;Jian Xiong Wang;G. Jing;Z. Shen;B. Zou;H. Fan;M. Olivo
不同截面的CdS纳米带为深入理解光腔与自发辐射之间的相互作用提供了机会。本文采用简单的物理气相沉积法合成了截面渐变的长锥形纳米带。利用形貌相关的微区光致发光（PL）谱研究了沿着不同低对称截面的珀塞尔效应。光致发光谱上的尖峰表明，当光腔和自发辐射之间发生模式匹配时，光模的局域密度增加。在具有良好定义的椭圆截面和优化的宽度/厚度比为1.45的单个CdS纳米管中观察到与束缚激子复合物相关的放大自发辐射。偏振拉曼光谱和透射电镜证实了纳米晶的生长方向为[0002]方向，且具有良好的质量。研究结果表明，该截面谐振腔对腔量子电动力学在CdS纳米粒子中的基础和实际应用具有重要意义。
CdS nanoribbons with various cross sections offer the opportunity to deeply understand the interaction between optical cavity and spontaneous emission. Herein, long tapered nanoribbons with the cross sections gradually changing were synthesized by a simple physical vapour deposition method. Morphology dependent micro-region photoluminescence (PL) spectroscopy is employed to show Purcell effect along different low symmetry cross sections. Spikes on the PL spectra reveal that local density of optical modes increases when the mode match happens between optical cavity and spontaneous emission. Bound exciton complex related amplified spontaneous emission is observed in a single CdS nanoribbon with well-defined elliptical cross sections and optimized width/thickness ratio ∼1.45. Polarized Raman and TEM confirmed that the nanoribbon with the elliptical cross section adopts the [0002] growth direction with good quality. The results suggest that the cross section resonant cavity would be of importance for both fundamental and practical application of cavity quantum electrodynamics in CdS nanoribbon.