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Coaxial plasmonic waveguide array as a negative-index metamaterial.

F J Rodríguez-Fortuño¹, C García-Meca, R Ortuño

¹Valencia Nanophotonics Technology Center, Universidad Politécnica de Valencia, 46022 Valencia, Spain. frarodfo@ntc.upv.es

|November 3, 2009

Summary

We introduce deep-subwavelength plasmonic coaxial waveguides as novel negative-index metamaterials. These structures exhibit backward propagating modes at visible frequencies, offering unique electromagnetic properties for advanced applications.

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Area of Science:

* Photonics and Nanotechnology
* Metamaterials Science
* Plasmonics

Background:

* Negative-index metamaterials (NIMs) are crucial for manipulating electromagnetic waves.
* Existing NIMs often face limitations in terms of size, bandwidth, or fabrication complexity.
* Plasmonic waveguides offer subwavelength confinement of light, enabling novel optical functionalities.

Purpose of the Study:

* To propose and investigate deep-subwavelength plasmonic coaxial waveguides as NIMs.
* To analyze the propagation properties and performance of these proposed metamaterials.
* To evaluate the transmission losses in the metamaterial structure.

Main Methods:

* Numerical simulations were employed to study the waveguide and metamaterial properties.

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* Analysis focused on the dispersion relation of the constitutive waveguides.

* Transmission loss through the proposed structure was systematically analyzed.

Main Results:

* Closely packed deep-subwavelength plasmonic coaxial waveguides support backward propagating modes.
* Metamaterial properties are governed by the dispersion relation of the individual waveguides.
* The metamaterial demonstrates polarization independence and subwavelength characteristics.

Conclusions:

* Plasmonic coaxial waveguides offer a viable route to realizing effective negative-index metamaterials.
* The proposed NIMs exhibit desirable properties such as polarization independence and subwavelength nature.
* Further analysis of transmission losses is essential for practical device implementation.