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Optical anisotropy in vertically oriented TiO2 nanotube arrays.

Yun Zhang1, Samira Farsinezhad1, Benjamin D Wiltshire1

  • 1Department of Electrical and Computer Engineering, University of Alberta, 9211-116 St, Edmonton, Alberta, T6G 1H9, Canada.

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Summary

Titania nanotube arrays (TNTAs) show significant optical anisotropy, exceeding bulk crystals. These nanofabricated films offer potential for advanced optical devices and metamaterials.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Nanofabricated optically anisotropic uniaxial thin films are key for low-loss metamaterials.
  • Dyakonov surface waves enable subwavelength optical confinement at interfaces.

Purpose of the Study:

  • Investigate optical properties of self-organized titania nanotube arrays (TNTAs).
  • Analyze TNTAs fabricated via electrochemical anodization and annealed at 500 °C and 750 °C.

Main Methods:

  • X-ray diffraction and Raman spectroscopy for structural analysis.
  • Variable angle spectroscopic ellipsometry for optical anisotropy measurement.
  • Comparison with effective medium approximations.

Main Results:

  • Phonon confinement observed in TNTAs annealed at 500 °C.
  • Positive birefringence (Δn) exceeding 0.06 in both anatase and mixed-phase TNTAs.
  • Mixed-phase TNTAs exhibited Δn as high as 0.15.
  • Measured Δn surpassed that of bulk anatase single crystals.

Conclusions:

  • Nanostructured dielectrics like TNTAs can outperform bulk crystals in directional refractive index contrast.
  • TNTAs are promising platforms for all-dielectric metamaterials and optical guiding.