Abstract

A tailor-designed acoustic trap has been built and tested as a sample handling device for use in laser spectroscopy. It is based on a piezoelectric vibrator that sets up a standing acoustic wave with several nodes into which liquid or solid samples may be placed and held in a levitated position. The usefulness of such a system to hold samples without the need for sample cells was demonstrated for various experiments involving direct spectroscopic measurements on the suspended sample. Changes in the UV spectrum of bromo-cresol green dye during a simple pH titration on a drop of the levitated solution were followed by dual dye laser spectrometry. A chemical actinometry spectrochemistry experiment was conducted on Aberchrome 540 fulgide dissolved in DMSO in the levitated state by following changes in the molecular structure of the fulgide by Raman spectroscopy. Finally, crystallization experiments were carried out on droplets and bubbles of tris-(hydroxymethyl)-aminomethane and l-cystein.

Chemical elemental analysis of single acoustic-levitated water droplets by laser-induced breakdown spectroscopy

Victor Contreras, Ricardo Valencia, Jairo Peralta, H. Sobral, M. A. Meneses-Nava, and Horacio Martinez
Opt. Lett. 43(10) 2260-2263 (2018)

Individual particle handling in a microfluidic system based on parallel laser trapping

Philippe Hamel, Bastien Rachet, Michael Werner, Mathieu Grossenbacher, Horst Vogel, Martin Forrer, Peter Ryser, and René P. Salathé
Opt. Lett. 36(16) 3182-3184 (2011)

Levitated droplet dye laser

H. Azzouz, L. Alkhafadiji, S. Balslev, J. Johansson, N. A. Mortensen, S. Nilsson, and A. Kristensen
Opt. Express 14(10) 4374-4379 (2006)

Combined acoustic and optical trapping

G. Thalhammer, R. Steiger, M. Meinschad, M. Hill, S. Bernet, and M. Ritsch-Marte
Biomed. Opt. Express 2(10) 2859-2870 (2011)

Micro-laser-induced breakdown spectroscopy technique: a powerful method for performing quantitative surface mapping on conductive and nonconductive samples

Denis Menut, Pascal Fichet, Jean-Luc Lacour, Annie Rivoallan, and Patrick Mauchien
Appl. Opt. 42(30) 6063-6071 (2003)