Eur. Phys. J. B (2013) 86: 232
https://doi.org/10.1140/epjb/e2013-40049-8

Regular Article

Optical manipulation of complex molecular systems by high density green photons: experimental and theoretical evidence

¹ Department of Theoretical Physics, National Institute for Physics and Nuclear Engineering, 077125 Magurele, Romania
² Interdisciplinary Research Group, Romanian Academy, 010071 Bucharest, Romania
³ Materials & Multifunctional Structures, National Institute of Materials Physics, 077125 Magurele, Romania
⁴ Academy of Medical Sciences, 077125 Bucharest, Romania
⁵ Department of Biophysics, University of Bucharest, 077125 Bucharest, Romania
⁶ Department of Chemistry, University of Bucharest, 077125 Bucharest, Romania

^a e-mail: silv@infim.ro

Received: 22 January 2013
Received in final form: 6 February 2013
Published online: 29 May 2013

Abstract

The recent revolution in modern optical techniques revealed that light interaction with matter generates a force, known as optical force, which produces material properties known in physics as optical matter. The basic technique of the domain uses forces exerted by a strongly focused beam of light to trap small objects and subsequently to manipulate their local structures. The purpose of this paper is to develop an alternative approach, using irradiations with high-density-green-photons, which induce electric dipoles by polarization effects. The materials used for the experiments were long carbon chains which represent the framework of biological macromolecules. The physical techniques used to reveal the locally induced molecular arrangements were: dynamic viscosity, zeta potential, chemiluminescence, liquid chromatography; mass spectrometry, and Raman and infrared spectroscopy. The principal result of our experiments was the detection of different molecular arrangements within the mixture of alkane chains, generated by our optical manipulations. This induced “optical matter” displayed two material properties: antioxidant effects and large molecular aggregation effects. In order to bring the experimental results in relation with theory, we developed a physical model and the interacting force between polarizable bodies was computed. By numerical calculations stable structures for N = 6 and N = 8 particles were obtained.