| Optical matching layer structures in evanescent coupling photodiodes at a wavelength of 1.55μm： physics,design and simulation |
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| 引用本文： | 张云,左玉华,郭剑川,丁武昌,成步文,余金中,王启明.Optical matching layer structures in evanescent coupling photodiodes at a wavelength of 1.55μm： physics,design and simulation[J].中国物理 B,2009,18(1):225-230. |
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| 作者姓名： | 张云 左玉华 郭剑川 丁武昌 成步文 余金中 王启明 |
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| 作者单位： | State Key Laboratory on Integrated Optoelectronics,
Institute of Semiconductors, Chinese Academy of Sciences, Beijing
100083, China |
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| 基金项目： | Project supported by the National
High Technology Research and Development Program of China (Grant No
2006CB302802). |
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| 摘 要： | We have studied the optical matching layers (OMLs) and external
quantum efficiency in the evanescent coupling photodiodes (ECPDs)
integrating a diluted waveguide as a fibre-to-waveguide coupler, by
using the semi-vectorial beam propagation method (BPM). The physical
basis of OML has been identified, thereby a general designing rule
of OML is developed in such a kind of photodiode. In addition, the
external quantum efficiency and the polarization sensitivity versus
the absorption and coupling length are analysed. With an optical
matching layer, the absorption medium with a length of 30μm
could absorb 90% of the incident light at 1.55μm
wavelength, thus the total absorption increases more than 7 times
over that of the photodiode without any optical matching layer.
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| 关 键 词： | optical matching evanescent coupling diluted waveguide waveguide photodiode |
| 收稿时间： | 2008-03-27 |
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