Mingzhen Tang et al 2007 Nanotechnology 18 485304 doi:10.1088/0957-4484/18/48/485304
Mingzhen Tang1, Haitao Zhang2,3 and Tsing-Hua Her1,2
Show affiliationsTunable and highly uniform tungsten nanogratings on sapphires are demonstrated by scanning a 400 nm femtosecond-pulsed laser with pulse energy less than half of a nanojoule during laser-induced chemical vapor deposition. These gratings possess very good uniformity in both the grating period (standard deviation less than 1.5%) and the tooth length (less than 4%), and can be tuned by controlling the laser power and scanning speed. We show that nanogratings can be easily fabricated on non-planar substrates such as glass optical fibers, and can be turned into larger-area one-dimensional gratings by an appropriate offset during multiple scans. A model based on local field enhancement and interference between the incident light and plasmon radiation is proposed to explain the anisotropic shape and the periodic appearance of the observed tungsten nanogratings.
Issue 48 (5 December 2007)
Received 16 July 2007, in final form 14 September 2007
Published 30 October 2007
A Corrigendum for this article has been published in 2009 Nanotechnology 20 199802
Mingzhen Tang et al 2007 Nanotechnology 18 485304
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