Reversible assembly of gold nanoparticles confined in an optical microcage.
Reversible assembly of gold nanoparticles confined in an optical microcage.
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DOI：
10.1103/physreve.70.061406
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
H. Yoshikawa;Togo Matsui;H. Masuhara
中科院分区：
文献类型：
--
作者：
H. Yoshikawa;Togo Matsui;H. Masuhara
当聚焦激光对纳米粒子进行光学捕获时，多个粒子被抓住焦点并组装在一起。被限制在这种亚微米光学笼子中的金纳米粒子显示出依赖于激光功率的特征消光光谱。通过调节激光功率，可以可逆地、重复地诱导光谱变化，表明金纳米粒子的组装可以通过梯度力来控制。这归因于纳米粒子在静电势垒中的软限制。
As optical trapping by a focused laser beam is applied for nanoparticles, multiple particles are grasped in the focal spot and make an assembly. Gold nanoparticles confined in such a submicrometer optical cage show a characteristic extinction spectrum depending on laser power. The spectral change can be induced reversibly and repeatedly by tuning the laser power, demonstrating that the assembly of gold nanoparticles can be controlled by the gradient force. This is attributed to the soft confinement of nanoparticles dressed in electrostatic potential barriers.