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Polarization-dependent bandwidth in low-index plasmonic metamaterials.

Hossein Alisafaee, Michael A Fiddy

|January 22, 2015

Summary

Optical metamaterials with a refractive index less than one (n<1) show polarization-dependent bandwidth. Changing incident light polarization significantly enhances the low-index bandwidth of plasmonic gold nanoparticle structures.

Area of Science:

Photonics and optical metamaterials.
Plasmonics and nanoparticle optics.
Electromagnetic wave interactions.

Background:

Optical metamaterials offer unique light manipulation properties.
Achieving a refractive index less than one (n<1) is crucial for novel optical applications.
The spectral characteristics of metamaterials are often sensitive to design and incident light conditions.

Purpose of the Study:

To investigate the refractive index bandwidth (n<1) of a plasmonic gold nanoparticle metamaterial.
To determine the influence of incident light polarization on the low-index bandwidth.
To explore methods for enhancing the low-index bandwidth.

Main Methods:

Utilizing the full-wave finite element method for spectral analysis.

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Simulating the optical response of metamaterial structures composed of gold nanoparticles.

Analyzing the refractive index as a function of wavelength and polarization.

Main Results:

Identified spectral bands where the metamaterial exhibits a refractive index less than one.
Demonstrated a significant, polarization-dependent enhancement of the low-index bandwidth (up to 270%).
Extended the low-index range from 503-600 nm to 485-750 nm by adjusting polarization.

Conclusions:

The refractive index bandwidth of plasmonic metamaterials is highly sensitive to incident light polarization.
Polarization control offers a powerful method to tune and expand the low-index bandwidth of metamaterials.
The observed asymmetric bandwidth extension towards the near-infrared presents opportunities for advanced optical device development.