Optical matching layer structures in evanescent coupling photodiodes at a wavelength of 1.55 μm:physics,design and simulation  

作　　者：张云 左玉华 郭剑川 丁武昌 成步文 金中 王启明 

机构地区：[1]State Key Laboratory on Integrated Optoelectronics,Institute of Semiconductors,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2009年第1期225-230,共6页中国物理B（英文版）

基　　金：Project supported by the National High Technology Research and Development Program of China (Grant No 2006CB302802)

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.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.

关 键 词：optical matching evanescent coupling diluted waveguide waveguide photodiode 

分 类 号：TN364.2[电子电信—物理电子学]