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Plasmon-coupled tip-enhanced near-field optical microscopy.

A Bouhelier¹, J Renger, M R Beversluis

¹The Institute of Optics, University of Rochester, Rochester, NY 14627, USA. bouhelie@optics.rochester.edu

Journal of Microscopy

|June 6, 2003

Summary

Researchers demonstrate how to create a nanoscale optical near-field source using a metal-coated fiber optic tip. Radially polarized light couples to surface plasmons, generating a strong, localized field enhancement at the tip

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Area of Science:

Photonics and Nanotechnology
Optics and Electromagnetism

Background:

Guided waveguide modes in optical fibers can couple to surface plasmons.
Surface plasmons propagate along the metal coating of fiber optic tips.

Purpose of the Study:

To investigate the generation of nanoscale optical near-field sources.
To explore field enhancement at the apex of metal-coated fiber tips.

Main Methods:

Theoretical calculations of electromagnetic field interactions.
Analysis of surface plasmon propagation and interference.
Simulation of waveguide mode coupling to surface plasmons.

Main Results:

Surface plasmons converge and interfere constructively at the fiber tip apex.

Related Experiment Videos

A radially polarized waveguide mode induces significant field enhancement.

This localized enhanced field acts as a nanoscale optical near-field source.

Conclusions:

Metal-coated fiber tips can function as nanoscale optical near-field sources.
Tailoring the polarization of waveguide modes is crucial for field enhancement.
This technique offers potential for advanced nanoscale optical applications.