Browsing by Author "Wang, Hsuan-I"

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Anisotropic optical transmission of femtosecond laser induced periodic surface nanostructures on indium-tin-oxide films
(2012-09-03)
Wang, Chih
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Wang, Hsuan-I
;
Luo, Chih-Wei
;
Leu, Jihperng
;
材料科學與工程學系
Two types of periodic nanostructures, self-organized nanodots and nanolines, were fabricated on the surfaces of indium-tin-oxide (ITO) films using femtosecond laser pulse irradiation. Multiple periodicities (approximately 800 nm and 400 nm) were clearly observed on the ITO films with nanodot and nanoline structures and were identified using two-dimensional Fourier transformation patterns. Both nanostructures show the anisotropic transmission characteristics in the visible range, which are strongly correlated with the geometry and the metallic content of the laser-induced nanostructures. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4751983]
Superior local conductivity in self-organized nanodots on indium-tin-oxide films induced by femtosecond laser pulses
(2011-11-21)
Wang, Chih
;
Wang, Hsuan-I
;
Tang, Wei-Tsung
;
Luo, Chih-Wei
;
Kobayashi, Takayoshi
Large-area surface ripple structures of indium-tin-oxide films, composed of self-organized nanodots, were induced by femtosecond laser pulses, without scanning. The multi-periodic spacing (similar to 800 nm, similar to 400 nm and similar to 200 nm) was observed in the laser-induced ripple of ITO films. The local conductivity of ITO films is significantly higher, by approximately 30 times, than that of the as-deposited ITO films, due to the formation of these nanodots. Such a significant change can be ascribed to the formation of indium metal-like clusters, which appear as budges of similar to 5 nm height, due to an effective volume increase after breaking the In-O to form In-In bonding. (C) 2011 Optical Society of America