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Proceedings Paper

Direct coupling for double metal-cladding waveguide and its application
Author(s): Honggen Li; Qing Liu; Wen Yuan; Qishun Shen; Zhuangqi Cao
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Paper Abstract

In this paper, we present a novel coupling method, direct coupling method, for double metal-cladding waveguide which is free from using the prism, grating or other coupling elements. The double metal-cladding waveguide used in our experiment is a metal-dielectric-metal three layer structure. Through ATR scanning technique, we demonstrate that light could be directly coupled into the waveguide successfully with this structure. The direct coupling method not only avoids the difficulty of grating fabrication process in grating coupling method, but also the coupling gap adjustment problem in prism coupling method. The application of this coupling method keeps advantages of the prism coupling technique in the optical parameters measurement for thin films. It also has some extra advantages. Since high order modes could be coupled into thick film waveguide while it is hard for prism coupling technique, the thickness of thick films (0. lmm—lmm) can be determined. Moreover, light can be coupled at any position on the surface of the waveguide, thus it can be used to detect almost the whole area of the film. Our experimental results agree well with the theoretical prediction.

Paper Details

Date Published: 28 August 2002
PDF: 7 pages
Proc. SPIE 4904, Optical Fiber and Planar Waveguide Technology II, (28 August 2002); doi: 10.1117/12.481257
Show Author Affiliations
Honggen Li, Shanghai Jiaotong Univ. (China)
Qing Liu, Shanghai Jiaotong Univ. (China)
Wen Yuan, Shanghai Jiaotong Univ. (China)
Qishun Shen, Shanghai Jiaotong Univ. (China)
Zhuangqi Cao, Shanghai Jiaotong Univ. (China)

Published in SPIE Proceedings Vol. 4904:
Optical Fiber and Planar Waveguide Technology II
Shuisheng Jian; Steven Shen; Katsunari Okamoto, Editor(s)

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