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Proceedings Paper

A versatile system for optical manipulation experiments
Author(s): Dag Hanstorp; Maksym Ivanov; Ademir F. Alemán Hernández; Jonas Enger; Ana M. Gallego; Oscar Isaksson; Carl-Joar Karlsson; Ricardo Monroy Villa; Alvin Varghese; Kelken Chang
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Paper Abstract

In this paper a versatile experimental system for optical levitation is presented. Microscopic liquid droplets are produced on demand from piezo-electrically driven dispensers. The charge of the droplets is controlled by applying an electric field on the piezo-dispenser head. The dispenser releases droplets into a vertically focused laser beam. The size and position in 3 dimensions of trapped droplets are measured using two orthogonally placed high speed cameras. Alternatively, the vertical position is determined by imaging scattered light onto a position sensitive detector. The charge of a trapped droplets is determined by recording its motion when an electric field is applied, and the charge can be altered by exposing the droplet to a radioactive source or UV light. Further, spectroscopic information of the trapped droplet is obtained by imaging the droplet on the entrance slit of a spectrometer. Finally, the trapping cell can be evacuated, allowing investigations of droplet dynamics in vacuum. The system is utilized to study a variety of physical phenomena, and three pilot experiments are given in this paper. First, a system used to control and measure the charge of the droplet is presented. Second, it is demonstrated how particles can be made to rotate and spin by trapping them using optical vortices. Finally, the Raman spectra of trapped glycerol droplets are obtained and analyzed. The long term goal of this work is to create a system where interactions of droplets with the surrounding medium or with other droplets can be studied with full control of all physical variables.

Paper Details

Date Published: 25 August 2017
PDF: 12 pages
Proc. SPIE 10347, Optical Trapping and Optical Micromanipulation XIV, 103472C (25 August 2017); doi: 10.1117/12.2272983
Show Author Affiliations
Dag Hanstorp, Göteborgs Univ. (Sweden)
Maksym Ivanov, Vilnius Univ. (Lithuania)
Ademir F. Alemán Hernández, Univ. of Gothenburg (Sweden)
Jonas Enger, Univ. of Gothenburg (Sweden)
Ana M. Gallego, Univ. Nacional Autónoma de México (Mexico)
Oscar Isaksson, Univ. of Gothenburg (Sweden)
Carl-Joar Karlsson, Univ. of Gothenburg (Sweden)
Ricardo Monroy Villa, Univ. Nacional Autónoma de México (Mexico)
Alvin Varghese, Cochin Univ. of Science and Technology (India)
Kelken Chang, Univ. of Gothenburg (Sweden)

Published in SPIE Proceedings Vol. 10347:
Optical Trapping and Optical Micromanipulation XIV
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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