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A versatile system for optical manipulation experiments

Conference paper
Authors Dag Hanstorp
Maksym Ivanov
Ademir F. Alemán Hernández
Jonas Enger
Ana Gallego
Oscar Isaksson
Carl-Joar Karlsson
Ricardo Monroy Villa
Alvin Varghese
Kelken Chang
Published in Proceedings of SPIE - The International Society for Optical Engineering. SPIE Nanoscience + Engineering, 2017, San Diego, California, United States
ISBN 978-1-5106-1152-8
ISSN 0277-786X
Publisher SPIE
Publication year 2017
Published at Department of Physics (GU)
Language en
Links https://doi.org/10.1117/12.2272983
Keywords droplet coalescence, droplet dispensers, high-speed imaging, Laguerre-Gaussian beams, lasers, liquid droplets, Optical levitation, optical vortices, orbital angular momentum, uorescence spectroscopy
Subject categories Optics

Abstract

Downloading of the abstract is permitted for personal use only. 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.

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