University of Twente Student Theses


Angular dependence of Evanescent Field Enhancement on a glass-air interface

Thompson, David (2014) Angular dependence of Evanescent Field Enhancement on a glass-air interface.

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Abstract:The purpose of this project was to determine experimentally the dependence on the angle of incidence of the enhancement of the evanescent field during total internal reflection. To achieve this a setup was realised to measure the emission by a fluorescent sample placed upon the planar surface of a semi-cylindrical lense, which was excited by a 467 nm diode laser over a wide range of incident angles. The fluorescent light was subsequently collected by an objective and the photon count was measured with the use of a lense focusing the light onto a Photomultiplier tube. As the near-field enhancement is dependent on the polarisation of the incident light, a linear polariser was placed between the source and te sample, and measurements were carried out for different polarisation states. The results of the s-polarisation measurements agree reasonably with the theory and are thus succesfull, the measurements under p-polarisation do not agree with theory, and will need further scrutiny.
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics BSc (56962)
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