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Original Articles

Distribution of polarization vector for evanescent optical near-field

Pages 1801-1810 | Received 13 Jun 2007, Accepted 19 Nov 2007, Published online: 13 Jun 2008
 

Abstract

An analysis with the Fresnel formula is presented as possible ways of creating an elliptically polarized evanescent optical field from a linearly polarized laser beam. Under a certain condition a quadrature phase difference is created while light faces total reflection. It has been observed that there is a translational symmetry of the field normal to the plane of incidence (Y-axis); in this direction the field is always linearly polarized. In the other orthogonal directions the field can be elliptically polarized. Looking normal to the plane of the interface (along the Z-axis), one can see an elliptical polarization with varying ellipticity at various z. A circular polarization is also achievable at some particular combination of angle of polarization vector and angle of incidence.

Acknowledgement

The author thankfully acknowledges assistance from the Council of Scientific and Industrial Research, Government of India.

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