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year 27, Issue 2 (ICOP & ICPET 2021 2021)
ICOP & ICPET _ INPC _ ICOFS 2021, 27(2): 621-624 |
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Khorshad A A, Rahimi-tabar M R, Seyed-Reihani S N. Position Detection of Optically Trapped Gold Nano-particles using Moiré Technique . ICOP & ICPET _ INPC _ ICOFS 2021; 27 (2) :621-624
URL: http://opsi.ir/article-1-2442-en.html
URL: http://opsi.ir/article-1-2442-en.html
1- Sharif University of Technology, Tehran, Iran
Abstract: (879 Views)
Optical trapping of Gold Nano-Particles (GNP) is important due to their higher trap efficiencies and also single molecule biophysics experiments. The conventional method for position detection of GNP is QPD according to a back-focal-plane interferometry model. In this paper we show, both by theory and experiment, that simple, inexpensive and precise Moiré Technique (MT) is able to measure GNP position more sensitive than that of the QPD method for 20-250 nm range GNP. As an example, MT provides 71% higher detection sensitivity in compared to the QPD method for 150 nm diameter gold bead. However, larger detection sensitivity potentially increases spatial resolution of GNP, leads to measure optical forces more accurately.
Keywords: Optical trapping, Optical tweezers, Position detection, Gold Nano-particles, Moiré technique
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