Hajizadeh Faeghe, Reihani S Nader S
Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran.
Opt Express. 2010 Jan 18;18(2):551-9. doi: 10.1364/OE.18.000551.
Metallic nanoparticles are of significant interest due to their particular optical and biological applications. Gold nanoparticles are proven to be excellent candidate for in vivo micro-manipulation using Optical Tweezers. This manuscript reports on stable 3-D trapping of 9.5-254nm gold nanospheres using substantially decreased laser power. The lower limit is approximately 2 times smaller than previous record. 5.4nm gold nanospheres were trapped for only 2-3 seconds. For the first time, our experimental data verify the volume corrected Rayleigh model for particles smaller than 100nm in diameter. Measuring the maximum applicable force for gold nanoparticles, we have shown that a few tens of milli-Watts of laser power can produce pico-Newton range forces.
金属纳米颗粒因其特殊的光学和生物学应用而备受关注。金纳米颗粒被证明是使用光镊进行体内微操作的极佳候选材料。本文报道了使用大幅降低的激光功率对9.5 - 254nm金纳米球进行稳定的三维捕获。下限比之前的记录小约2倍。5.4nm的金纳米球仅被捕获了2 - 3秒。我们的实验数据首次验证了直径小于100nm颗粒的体积校正瑞利模型。通过测量金纳米颗粒的最大适用力，我们发现几十毫瓦的激光功率就能产生皮牛顿量级的力。
