Lecture_12_2011

Lecture_12_2011 - field, which is the center of the beam....

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Introduction to Biophysics Lecture 11 Focus on microsystem
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An optical tweezer is a scientific instrument that uses a focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch to physically hold and move microscopic dielectric objects. Optical tweezers have been particularly successful in studying a variety of biological systems in recent years. Dielectric particles are attracted along the gradient to the region of strongest electric
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Unformatted text preview: field, which is the center of the beam. The scattering force results in the particle being displaced slightly downstream from the exact position of the beam waist. Microscope objective The force applied on the object depends linearly on displacement from the trap center. Kinetic interpretation of Bolzmann distribution Homework: Nelson: your turn 6I, page 229...
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Lecture_12_2011 - field, which is the center of the beam....

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