Browsing by Author "Ho, Chi-Ting"

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Fabrication of optical filters based on polymer asymmetric Bragg couplers
(2009-09-28)
Chuang, Wei-Ching
;
Lee, An-Chen
;
Chao, Ching-Kong
;
Ho, Chi-Ting
;
機械工程學系
In this work, we successfully developed a process to fabricate dual-channel polymeric waveguide filters based on an asymmetric Bragg coupler (ABC) using holographic interference techniques, soft lithography, and micro molding. At the cross-and self-reflection Bragg wavelengths, the transmission dips of approximately -16.4 and -11.5dB relative to the 3dB background insertion loss and the 3dB transmission bandwidths of approximately 0.6 and 0.5nm were obtained from an ABC-based filter. The transmission spectrum overlaps when the effective index difference between two single waveguides is less than 0.002. (C) 2009 Optical Society of America
Using a micro-molding process to fabricate polymeric wavelength filters
(2008-08-01)
Chuang, Wei-Ching
;
Lee, An-Chen
;
Ho, Chi-Ting
;
機械工程學系
;
Department of Mechanical Engineering
A procedure for fabricating a high aspect ratio periodic structure on a UV polymer at submicron order using holographic interferometry and molding;processes is described. First, holographic interferometry using a He-Cd (325 nm) laser was used to create the master of the periodic line structure on an i-line sub-micron positive photoresist film. A 20 nm nickel thin film was then sputtered on the photoresist. The final line pattern on a UV polymer was obtained from casting against the master mold. Finally, a SU8 polymer was spun on the polymer grating; to form a planar waveguide or a channel waveguide. The measurement results show that the waveguide length could be reduced for the waveguide having gratings with a high aspect ratio. (c) 2008 Elsevier B.V. All rights reserved.