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The metrics of surface adsorbed small molecules on the Young's fringe dual-slab waveguide interferometer.

Cross, G. H. and Reeves, A. and Brand, S. and Swann, M. J. and Peel, L. L. and Freeman, N. J. and Lu, J. R. (2004) 'The metrics of surface adsorbed small molecules on the Young's fringe dual-slab waveguide interferometer.', Journal of physics D : applied physics., 37 (1). pp. 74-80.


A method for analysing thin films using a dual-waveguide interferometric technique is described. Alternate dual polarization addressing of the interferometer sensor using a ferroelectric liquid crystal polarization switch allowed the opto-geometrical properties (density and thickness) of adsorbed layers at a solid-liquid interface to be determined. Differences in the waveguide mode dispersion between the transverse electric and transverse magnetic modes allowed unique combinations of layer thickness and refractive index to be determined at all stages; of the layer formation process. The technique has been verified by comparing the analysis of the surface adsorption of surfactants with data obtained using neutron scattering techniques, observing their behaviour on trimethylsilane coated silicon oxynitride surfaces. The data obtained were found to be in excellent agreement with analogous neutron scattering experiments and the precision of the measurements taken to be of the order of 40 pm with respect to adsorbed layer thicknesses. The study was extended to a series of surfactants whose layer morphology could be correlated with their hydrophilicity/lipophilicity balance. Those in the series with longer alkyl chains were observed to form thinner, denser layers at the hydrophobic solid/aqueous liquid interface and the degree of order attained at sub-critical micelle concentrations to be correlated with molecular fluidity. The technique is expected to find utility with those interested in thin film analysis. An important and growing area of application is within the life sciences, especially in the field of protein structure and function.

Item Type:Article
Additional Information:This paper shows the quantitative data that can be obtained from using the dual slab waveguide interferometer in biological systems. The interferometer system was devised at Durham, experimental data was collected at Farfield Sensors and analysed with software developed by co-workers at Durham.
Keywords:Plasmon resonance, Interfaces, Biosensor.
Full text:Full text not available from this repository.
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Record Created:13 Dec 2006
Last Modified:20 Nov 2014 12:58

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