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Anisotropic metamaterial optical fibers
Optics Express
|May 14, 2015
Summary
Anisotropic metamaterial optical fibers, using nanoporous alumina filled with plasmonic metals, guide light with exotic modes. These structures exhibit unique electromagnetic properties and unusual Bessel function solutions.
Area of Science:
- Photonics and Metamaterials
- Optical Waveguide Engineering
Background:
- Waveguide properties are significantly altered by internal physical structures.
- Photonic crystal fibers and metamaterial-loaded waveguides demonstrate light confinement and sub-cutoff propagation.
Purpose of the Study:
- To investigate novel light-guiding structures using anisotropic metamaterials in cylindrical geometries.
- To explore the potential of anodized nanoporous alumina microtubes as anisotropic metamaterial optical fibers.
Main Methods:
- Fabrication of a microtube from anodized nanoporous alumina with radially emanating nanopores.
- Filling the nanopores with plasmonic metals (silver or gold) to enhance electromagnetic anisotropy.
- Theoretical analysis of modal solutions in these anisotropic circular waveguides.
Main Results:
- Demonstrated that anodized nanoporous alumina microtubes filled with plasmonic metals act as anisotropic metamaterial optical fibers.
- Observed a significant increase in electromagnetic anisotropy due to the metal-filled nanopores.
- Identified uncommon modal solutions characterized by Bessel functions with imaginary orders.
Conclusions:
- Anisotropic metamaterial optical fibers offer new possibilities for exotic mode propagation.
- The design of nanoporous structures filled with plasmonic metals provides a viable route to engineer advanced optical properties.
- These findings open avenues for novel applications in optical guiding and manipulation.
