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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 11 — May. 26, 2008
  • pp: 8106–8116

Gallium nitride nanorod arrays as low-refractive-index transparent media in the entire visible spectral region

Hung-Ying Chen, Hon-Way Lin, Chen-Ying Wu, Wei-Chun Chen, Jyh-Shin Chen, and Shangjr Gwo  »View Author Affiliations

Optics Express, Vol. 16, Issue 11, pp. 8106-8116 (2008)

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Vertically aligned gallium nitride (GaN) nanorod arrays grown by the catalyst-free, self-organized method based on plasma-assisted molecular-beam epitaxy are shown to behave as subwavelength optical media with low effective refractive indices. In the reflection spectra measured in the entire visible spectral region, strong reflectivity modulations are observed for all nanorod arrays, which are attributed to the effects of Fabry-Pérot microcavities formed within the nanorod arrays by the optically flat air/nanorods and nanorods/substrate interfaces. By analyzing the reflectivity interference fringes, we can quantitatively determine the refractive indices of GaN nanorod arrays as functions of light wavelength. We also propose a model for understanding the optical properties of GaN nanorod arrays in the transparent region. Using this model, good numerical fitting can be achieved for the reflectivity spectra.

© 2008 Optical Society of America

OCIS Codes
(160.5320) Materials : Photorefractive materials
(160.6000) Materials : Semiconductor materials
(300.6550) Spectroscopy : Spectroscopy, visible
(260.2065) Physical optics : Effective medium theory
(160.4236) Materials : Nanomaterials

ToC Category:

Original Manuscript: March 10, 2008
Revised Manuscript: May 1, 2008
Manuscript Accepted: May 1, 2008
Published: May 20, 2008

Hung-Ying Chen, Hon-Way Lin, Chen-Ying Wu, Wei-Chun Chen, Jyh-Shin Chen, and Shangjr Gwo, "Gallium nitride nanorod arrays as low-refractive-index transparent media in the entire visible spectral region," Opt. Express 16, 8106-8116 (2008)

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