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Improved spatial resolution of the chemical imaging sensor with a hybrid illumination that suppresses lateral diffusion of photocarriers

  • The chemical imaging sensor is a semiconductor-based chemical sensor capable of visualizing pH and ion distributions. The spatial resolution depends on the lateral diffusion of photocarriers generated by illumination of the semiconductor substrate. In this study, two types of optical setups, one based on a bundle of optical fibers and the other based on a binocular tube head, were developed to project a hybrid illumination of a modulated light beam and a ring-shaped constant illumination onto the sensor plate. An improved spatial resolution was realized by the ring-shaped constant illumination, which suppressed lateral diffusion of photocarriers by enhanced recombination due to the increased carrier concentration.

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Author:Koichiro Miyamoto, Kosuke Seki, Takeyuki Suto, Frederik WernerORCiD, Torsten WagnerORCiD, Michael Josef SchöningORCiD, Tatsuo Yoshinobu
DOI:https://doi.org/10.1016/j.snb.2018.07.016
ISSN:0925-4005
Parent Title (English):Sensor and Actuators B: Chemical
Publisher:Elsevier
Place of publication:Amsterdam
Document Type:Article
Language:English
Year of Completion:2018
Date of the Publication (Server):2018/10/22
Volume:273
First Page:1328
Last Page:1333
Link:http://doi.org/10.1016/j.snb.2018.07.016
Zugriffsart:bezahl
Institutes:FH Aachen / Fachbereich Medizintechnik und Technomathematik
FH Aachen / INB - Institut für Nano- und Biotechnologien
collections:Verlag / Elsevier