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Gallium nitride nanorod arrays as low-refractive-index transparent media in the entire visible spectral region
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 thedoi:10.1364/oe.16.008106 pmid:18545523 fatcat:amuduaum2nfvzfbhdc426ozzmq