Optical printing is a powerful all-optical method that allows the incorporation of colloidal nanoparticles (NPs) onto substrates with nanometric precision. Here, we present a systematic study of the accuracy of optical printing of Au and Ag NPs, using different laser powers and wavelengths. When using light of wavelength tuned to the localized surface plasmon resonance (LSPR) of the NPs, the accuracy improves as the laser power is reduced, whereas for wavelengths off the LSPR, the accuracy is independent of the laser power. Complementary studies of the printing times of the NPs reveal the roles of Brownian and deterministic motion. Calculated trajectories of the NPs, taking into account the interplay between optical forces, electrostatic forces, and Brownian motion, allowed us to rationalize the experimental results and gain a detailed insight into the mechanism of the printing process. A clear framework is laid out for future optimizations of optical printing and optical manipulation of NPs near substrates.

中文翻译：

---

单金和银纳米粒子光学印刷的精度和机械细节

光学印刷是一种功能强大的全光学方法，可以将胶体纳米颗粒（NPs）以纳米级的精度结合到基材上。在这里，我们对使用不同的激光功率和波长的金和银纳米粒子进行光学印刷的准确性进行了系统的研究。当使用波长调整为NP的局部表面等离子体共振（LSPR）的光时，精度随着激光功率的降低而提高，而对于非LSPR的波长，精度与激光功率无关。对NP印刷时间的补充研究揭示了布朗运动和确定性运动的作用。考虑到光学力，静电力和布朗运动之间的相互作用，计算出的NP的轨迹，让我们合理化实验结果并获得对印刷过程机理的详细了解。为在基板附近的NP进行光学印刷和光学处理的未来优化奠定了清晰的框架。