论文标题
硅纳米颗粒通过其偶极磁共振的尺寸选择性的光学印刷
Size-Selective Optical Printing of Silicon Nanoparticles through Their Dipolar Magnetic Resonance
论文作者
论文摘要
硅纳米颗粒具有独特的尺寸依赖性光学性能，因为它们在可见范围内的强电气和磁共振。但是，与其他（例如金属）纳米颗粒相比，它们的广泛应用是有限的，因为它们在单分散胶体上的准备仍然具有挑战性。利用纳米和微设备中Si纳米颗粒的独特性质要求能够从胶体悬浮液中对其进行分类和组织它们，以纳米计精度将其从胶体悬浮液中分类到固体基材的特定位置。在这里，我们证明了预定义且狭窄（$σ$ <10 nm）尺寸范围的无表面活性硅纳米颗粒可以通过来自多分散胶体悬浮液的光学打印来选择性地固定在基板上。尺寸选择性基于差分光学力，可以通过将光波长调整为纳米颗粒的尺寸依赖性磁性偶极谐振来应用于不同尺寸的纳米颗粒。
Silicon nanoparticles possess unique size-dependent optical properties due to their strong electric and magnetic resonances in the visible range. However, their widespread application has been limited, in comparison to other (e.g. metallic) nanoparticles, because their preparation on monodisperse colloids remains challenging. Exploiting the unique properties of Si nanoparticles in nano- and micro-devices calls for methods able to sort and organize them from a colloidal suspension onto specific positions of solid substrates with nanometric precision. Here, we demonstrate that surfactant-free Silicon nanoparticles of a predefined and narrow ($σ$ < 10 nm) size range can be selectively immobilized on a substrate by optical printing from a polydisperse colloidal suspension. The size selectivity is based on differential optical forces that can be applied on nanoparticles of different sizes by tuning the light wavelength to the size-dependent magnetic dipolar resonance of the nanoparticles.
