Laser printing of silicon nanoparticles with resonant optical electric and magnetic responses
Laser printing of silicon nanoparticles with resonant optical electric and magnetic responses
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DOI：
10.1038/ncomms4402
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发表时间：
2014-03-01
影响因子：
16.6
通讯作者：
Chichkov, Boris N.
中科院分区：
文献类型：
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作者：
Zywietz, Urs;Evlyukhin, Andrey B.;Chichkov, Boris N.
具有几百纳米尺寸的硅纳米颗粒由于其在可见光范围内的强电和磁偶极响应而表现出独特的光学性质。在这里，我们展示了一种新的激光打印技术的控制制造和硅纳米粒子的精确沉积。使用飞秒激光脉冲，可以改变Si纳米颗粒的尺寸及其晶相。由飞秒激光打印产生的Si纳米颗粒最初处于非晶相（a-Si）。它们可以通过用第二飞秒激光脉冲照射它们而转化为结晶相（c-Si）。与a-Si纳米颗粒相比，c-Si纳米颗粒的共振散射光谱发生蓝移，峰值强度高出约三倍。介电纳米粒子的共振光学响应的特征在于在激发模式中电磁能量的积累，其可用于实现纳米天线、纳米激光器和超材料。
Silicon nanoparticles with sizes of a few hundred nanometres exhibit unique optical properties due to their strong electric and magnetic dipole responses in the visible range. Here we demonstrate a novel laser printing technique for the controlled fabrication and precise deposition of silicon nanoparticles. Using femtosecond laser pulses it is possible to vary the size of Si nanoparticles and their crystallographic phase. Si nanoparticles produced by femtosecond laser printing are initially in an amorphous phase (a-Si). They can be converted into the crystalline phase (c-Si) by irradiating them with a second femtosecond laser pulse. The resonance-scattering spectrum of c-Si nanoparticles, compared with that of a-Si nanoparticles, is blue shifted and its peak intensity is about three times higher. Resonant optical responses of dielectric nanoparticles are characterized by accumulation of electromagnetic energy in the excited modes, which can be used for the realization of nanoantennas, nanolasers and metamaterials.