Evolution and Engineering of Precisely Controlled Ge Nanostructures on Scalable Array of Ordered Si Nano-pillars.
Evolution and Engineering of Precisely Controlled Ge Nanostructures on Scalable Array of Ordered Si Nano-pillars.
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DOI：
10.1038/srep28872
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发表时间：
2016-06-29
影响因子：
4.6
通讯作者：
Zhong Z
中科院分区：
文献类型：
--
作者：
Wang S;Zhou T;Li D;Zhong Z
具有精确可控量子纳米结构（QN）的可扩展有序纳米柱阵列是探索腔量子电动力学基本特征的理想候选者。它在未来量子通信和集成光子电路的创新纳米光电器件应用中也具有巨大潜力。在这里，我们提出了一种结合纳米球光刻和异质外延过程中自组装的混合系统的合成。很容易实现自组装Ge量子点（包括量子点项链（QDN）、量子点分子（QDM）和量子环（QR））在Si纳米柱上的精确定位和可控演化。考虑到由于柱上吸附原子的厚度依赖性和各向异性表面扩散导致的应变弛豫和不均匀Ge生长，发现了Si柱上Ge生长的综合情况。它阐明了柱上量子点可控增长的内在机制。此外，它还激发了一种有意的两步增长过程来设计支柱上的可控 QN。我们的结果为实现所需的纳米柱-QNs 系统铺平了一条有前途的途径，该系统由于 QNs 与单柱和周期性柱的腔模式之间的光谱和空间耦合而促进强光-物质相互作用。
The scalable array of ordered nano-pillars with precisely controllable quantum nanostructures (QNs) are ideal candidates for the exploration of the fundamental features of cavity quantum electrodynamics. It also has a great potential in the applications of innovative nano-optoelectronic devices for the future quantum communication and integrated photon circuits. Here, we present a synthesis of such hybrid system in combination of the nanosphere lithography and the self-assembly during heteroepitaxy. The precise positioning and controllable evolution of self-assembled Ge QNs, including quantum dot necklace(QDN), QD molecule(QDM) and quantum ring(QR), on Si nano-pillars are readily achieved. Considering the strain relaxation and the non-uniform Ge growth due to the thickness-dependent and anisotropic surface diffusion of adatoms on the pillars, the comprehensive scenario of the Ge growth on Si pillars is discovered. It clarifies the inherent mechanism underlying the controllable growth of the QNs on the pillar. Moreover, it inspires a deliberate two-step growth procedure to engineer the controllable QNs on the pillar. Our results pave a promising avenue to the achievement of desired nano-pillar-QNs system that facilitates the strong light-matter interaction due to both spectra and spatial coupling between the QNs and the cavity modes of a single pillar and the periodic pillars.