Novel 3D Au nanohole arrays with outstanding optical properties

In this paper, a novel nanohole array with three-dimensional structure was generated by colloidal lithography existing of a free-standing nanohole array that experiences the same environment on both sides in 3D space. In a practicable way, the nanoholes were lifted up from the substrates, resulting in undulate morphology. Therefore we name this a 3D nanohole array (3D-NHA), and the performance in optical applications was much improved compared to conventional 2D nanohole arrays (2D-NHAs) due to a nearly perfect surface plasmon energy matching on both surfaces of the arrays. There was a 1.5-fold improvement in extraordinary optical transmission and 1.7-fold enhancement in response sensitivity towards a change of refractive index compared to 2D-NHAs. Furthermore, a (1, 1) Au/air transmission peak appeared in the transmission spectra and showed high relative sensitivity and an excellent linear response over a wide spectral range. Besides improved optical properties, good transferabi…

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2012-12-21 10:34:20

Source: http://nanochemistry.blogspot.com/2012/12/novel-3d-au-nanohole-arrays-with.html