Microring bio-chemical sensor with integrated low dark current Ge photodetector

An integrated Ge photodetector of very low dark current density is demonstrated in an optoelectronic integrated circuit label-free biosensing system. The sensor system consists of a microring for optical sensing and a monolithically integrated Ge detector. For point-of-care applications, integration...

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Bibliographic Details
Published in:Applied physics letters 2015-03, Vol.106 (10)
Main Authors: Zang, Kai, Zhang, Dengke, Huo, Yijie, Chen, Xiaochi, Lu, Ching-Ying, Fei, Edward T., Kamins, Theodore I., Feng, Xue, Huang, Yidong, Harris, James S.
Format: Article
Language:English
Subjects:
Applied physics
Chemical sensors
Dark current
Integrated circuits
Optical communication
Optoelectronics
Organic chemistry
Photometers
Sensors
Signal to noise ratio
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Summary:An integrated Ge photodetector of very low dark current density is demonstrated in an optoelectronic integrated circuit label-free biosensing system. The sensor system consists of a microring for optical sensing and a monolithically integrated Ge detector. For point-of-care applications, integration of Ge detector increases the reliability of measurement by eliminating mechanical-optical alignment of output signals. Optimizing Ge detector performance will further enhance system signal-noise ratio and reliability. For homogeneous sensing, the system has a sensitivity of ∼18.8 nm/RIU and a detection limit of 3.50 × 10−5.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4915094