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Safe Experimentation in Optical Levitation of Charged Droplets Using Remote Labs

Journal article
Authors Oscar Isaksson
Jonas Enger
Mats Rostedt
Andreas Johansson
Dag Hanstorp
L. de la Torre
Published in Jove-Journal of Visualized Experiments
Issue 143
ISSN 1940-087X
Publication year 2019
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.3791/58699
Keywords Engineering, Issue 143, Optical Levitation, Remote Laboratory, Laser, Photon Pressure, Diffraction, Science & Technology - Other Topics
Subject categories Physical Sciences

Abstract

The work presents an experiment that allows the study of many fundamental physical processes, such as photon pressure, diffraction of light or the motion of charged particles in electrical fields. In this experiment, a focused laser beam pointing upwards levitate liquid droplets. The droplets are levitated by the photon pressure of the focused laser beam which balances the gravitational force. The diffraction pattern created when illuminated with laser light can help measure the size of a trapped droplet. The charge of the trapped droplet can be determined by studying its motion when a vertically directed electrical field is applied. There are several reasons motivating this experiment to be remotely controlled. The investments required for the setup exceeds the amount normally available in undergraduate teaching laboratories. The experiment requires a laser of Class 4, which is harmful to both skin and eyes and the experiment uses voltages that are harmful.

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