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Volume 25 - ICOP & ICPET 2019
ICOP & ICPET _ INPC _ ICOFS 2019, 25 - ICOP & ICPET 2019: 525-528 |
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Samadzadeh M, Hajizadeh F. Effect of viscosity on rotation of gold nanoparticles in optical trap. ICOP & ICPET _ INPC _ ICOFS 2019; 25 :525-528
URL: http://opsi.ir/article-1-1876-en.html
URL: http://opsi.ir/article-1-1876-en.html
1- Department Physics, Institute for advanced studies in basic sciences (IASBS), Zanjan, Iran
Abstract: (1960 Views)
Optical tweezers are powerful scientific instruments, which use a laser for trapping and controlling the motion of microscopic particles without any mechanical contact. A circularly polarized laser beam could apply orbital and spin angular momentums to trapped particles, which causes the particles to rotate. In this report, we optically trap gold nano spheres with 400 nm in diameter near the surface, and the effect of the numerical aperture and the viscosity of the surrounding medium on the rotation speed is investigated. The results show that with the numerical aperture of 1 for objective lens, it is possible to rotate a metallic nanoparticles up to 2.4 kHz, and the rotation speed is highly viscosity dependent.
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