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Trapping of Micro Particles in Nanoplasmonic Optical Lattice

Trapping of Micro Particles in Nanoplasmonic Optical Lattice

Published on: September 5, 2017

Engineering the dielectric function of plasmonic lattices.

Amit Agrawal¹, Z V Vardeny, Ajay Nahata

¹Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, UT 84112, USA.

|June 26, 2008

Summary

We measured the dielectric function (epsilon(omega)) of subwavelength aperture arrays to understand enhanced optical transmission (EOT). Random arrays show a plasma response, while plasmonic lattices exhibit resonant frequencies modulating this behavior.

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Area of Science:

Condensed matter physics
Nanophotonics
Terahertz spectroscopy

Background:

Enhanced optical transmission (EOT) through subwavelength apertures is a key phenomenon in nanophotonics.
Understanding the dielectric function (epsilon(omega)) is crucial for elucidating the physical mechanisms behind EOT.
Previous studies have explored EOT, but a comprehensive analysis of epsilon(omega) across different array structures and conditions is needed.

Purpose of the Study:

To systematically measure and analyze the dielectric function (epsilon(omega)) of subwavelength aperture arrays.
To investigate the influence of aperture size and incidence angle on epsilon(omega) and EOT.
To differentiate the epsilon(omega) response between random and plasmonic lattice aperture arrays.

Main Methods:

Terahertz time-domain spectroscopy (THz-TDS) was employed to measure epsilon(omega).
Fabrication of subwavelength aperture arrays in metal films.
Systematic variation of aperture size and incidence angle during measurements.

Main Results:

Simultaneous determination of both real and imaginary components of epsilon(omega).
Random aperture arrays exhibit a plasma response with an effective plasma frequency linked to aperture cutoff.
Plasmonic lattices show epsilon(omega) modulated by resonant frequencies corresponding to reciprocal lattice vectors, superimposed on a plasma envelope.

Conclusions:

The study provides a detailed understanding of the dielectric function's role in EOT.
The observed resonant frequencies in plasmonic lattices are linked to structural properties and reciprocal vectors.
A sum rule for oscillator strengths validates the approach, enabling engineering of EOT spectral resonances.