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year 27, Issue 1 (Iranian Nano-Photonic Conference 2020 2020)
ICOP & ICPET _ INPC _ ICOFS 2020, 27(1): 25-27 |
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Jannesari M, S Reihani S N, A. Akhlaghi E. Determination of the Boundary of Two Anti-correlated Regions in the Back Focal Intensity Distribution of Optical Tweezers by QPD. ICOP & ICPET _ INPC _ ICOFS 2020; 27 (1) :25-27
URL: http://opsi.ir/article-1-2244-en.html
URL: http://opsi.ir/article-1-2244-en.html
1- Department of Physics, Institute for Advanced Studies in Basic Science , Zanjan, Iran.
2- Department of Physics, Sharif University of Technology, Tehran, Iran.
2- Department of Physics, Sharif University of Technology, Tehran, Iran.
Abstract: (1381 Views)
One of the methods for measuring position of the trapped bead is detection by QPD in the Back Focal Plane of the condenser lens. Existence of two anti-correlated areas of intensity in the Fourier plane of the condenser lens, disrupts detection of trapped particles. In this paper, the presence of these two areas has been shown experimentally. To increase accuracy of measuring axial displacement, with considering total intensity of internal and external regions, we can have the best width of the linear region. We suggest using from Numerical Aperture equal to 0.6, to eliminate the effect of the second region.
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