Dr. Stephanie H. Jones Profile

Dr. Stephanie H. Jones

Postdoctoral Fellow

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Proceedings Article | 16 September 2014 Paper

The study of thin films on solid aerosol particles using optical trapping and Mie scattering from a broadband white LED

Stephanie Jones, Martin King, Andrew Ward

Proceedings Volume 9164, 91641X (2014) https://doi.org/10.1117/12.2061775

KEYWORDS: Silica, Aerosols, Refractive index, Optical tweezers, Atmospheric particles, Thin films, Mie scattering, Solids, Light emitting diodes, Thin film coatings

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A counter-propagating optical trap has been used to study thin organic films on the surface of solid particles levitated in air. Micron sized silica spheres have been trapped in air between opposed 1064 nm laser beams, and illuminated with a broadband white LED. Backscattered light from the trapped particle was collected to obtain a Mie spectrum over the 495-670 nm wavelength range and this was used to determine particle radius and wavelength dependent refractive index (Jones et al., 2013). The trapped particle was coated using a flow of organic vapour and the resultant thin film analysed using a coated sphere model. Resonance positions in the Mie spectrum were monitored with time in order to determine film formation, thickness and refractive index. Whilst thin films are believed to form naturally on atmospheric aerosols (Tervahattu et al., 2002), a debate remains as to whether the organic component completely coats the aerosol surface or partially engulfs it. Such films are readily oxidised in the atmosphere causing a change in aerosol properties and knowledge of aerosol properties is required to understand their effect on the climate. The use of optical trapping combined with Mie spectra acquisition to study and characterise coated solid particles is therefore an important step in atmospheric science.

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