Author
Loke, Vincent L. Y., Mengüç, Mustafa Pınar
Publication Date
2010-10
Publication Place
-
Optics InfoBase
Subject
Evanescent waves, Optics at Surfaces
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
1084-7529
Record ID
857f7af4-4616-4e96-acd4-b8fce635182e
Library Location
Mechanical Engineering
Date
2010-10
Notes
Due to copyright restrictions, the access to the full text of this article is only available via subscription.
Sample Text
Evanescent waves on a surface form due to the collective motion of charges within the medium. They do not carry any energy away from the surface and decay exponentially as a function of the distance. However, if there is any object within the evanescent field, electromagnetic energy within the medium is tunneled away and either absorbed or scattered. In this case, the absorption is localized, and potentially it can be used for selective diagnosis or nanopatterning applications. On the other hand, scattering of evanescent waves can be employed for characterization of nanoscale structures and particles on the surface. In this paper we present a numerical methodology to study the physics of such absorption and scattering mechanisms. We developed a MATLAB implementation of discrete dipole approximation with surface interaction (DDA-SI) in combinationwith evanescent wave illumination to investigate the near-field coupling between particles on the surface and a probe. This method can be used to explore the effects of a number of physical, geometrical, and materialproperties for problems involving nanostructures on or in the proximity of a substrate under arbitrary illumination.
DOI
10.1364/JOSAA.27.002293
Cilt
27
