中国物理B ›› 2009, Vol. 18 ›› Issue (1): 225-230.doi: 10.1088/1674-1056/18/1/037

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

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

张云, 左玉华, 郭剑川, 丁武昌, 成步文, 余金中, 王启明   

  1. State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
  • 收稿日期:2008-03-27 修回日期:2008-09-10 出版日期:2009-01-20 发布日期:2009-01-20
  • 基金资助:
    Project supported by the National High Technology Research and Development Program of China (Grant No 2006CB302802).

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

Zhang Yun(张云), Zuo Yu-Hua(左玉华)†, Guo Jian-Chuan(郭剑川), Ding Wu-Chang(丁武昌), Cheng Bu-Wen(成步文), Yu Jin-Zhong(余金中), and Wang Qi-Ming(王启明)   

  1. State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
  • Received:2008-03-27 Revised:2008-09-10 Online:2009-01-20 Published:2009-01-20
  • Supported by:
    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.

Abstract: 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.

Key words: optical matching, evanescent coupling, diluted waveguide, waveguide photodiode

中图分类号:  (Photodiodes; phototransistors; photoresistors)

  • 85.60.Dw
42.70.-a (Optical materials) 42.79.Wc (Optical coatings) 42.81.Bm (Fabrication, cladding, and splicing)