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Surface waves and atomic force microscope probe-particle near-field coupling: discrete dipole approximation with

Vincent L Y Loke¹, M Pinar Mengüç

¹Özyeğin University, School of Engineering, Altunizade, Istanbul, Turkey. Vincent.Loke@ozyegin.edu.tr

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|October 6, 2010

Summary

Evanescent waves near surfaces can be absorbed or scattered by nearby objects. This study presents a numerical method to explore these interactions for applications in nanoscale diagnosis and characterization.

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Area of Science:

Physics
Nanotechnology
Computational Electromagnetics

Background:

Evanescent waves are surface-bound electromagnetic fields that decay exponentially with distance.
Interactions with nearby objects can lead to localized absorption or scattering of evanescent wave energy.
These phenomena hold potential for nanoscale sensing, diagnosis, and material processing.

Purpose of the Study:

To develop and present a numerical methodology for studying evanescent wave interactions with surface-bound nanostructures.
To investigate the physics governing absorption and scattering mechanisms of evanescent waves.
To provide a tool for exploring the influence of various physical, geometrical, and material properties.

Main Methods:

Development of a MATLAB implementation of the discrete dipole approximation with surface interaction (DDA-SI).
Utilizing evanescent wave illumination in conjunction with the DDA-SI method.
Simulating near-field coupling between surface particles and a probe.

Main Results:

The DDA-SI method enables the study of localized absorption and scattering of evanescent waves.
The numerical approach allows for the exploration of interactions involving nanostructures near a substrate.
The methodology is adaptable to arbitrary illumination conditions and diverse material properties.

Conclusions:

The presented numerical methodology offers a robust framework for analyzing evanescent wave phenomena at the nanoscale.
This approach facilitates the design and optimization of applications leveraging evanescent wave absorption and scattering.
The study provides insights into near-field coupling for nanostructure characterization and manipulation.