Device simulation of the light-addressable potentiometric sensor with a novel photoexcitation method for a higher spatial resolution
- A novel photoexcitation method for the light-addressable potentiometric sensor (LAPS) realized a higher spatial resolution of chemical imaging. In this method, a modulated light probe, which generates the alternating photocurrent signal, is surrounded by a ring of constant light, which suppresses the lateral diffusion of photocarriers by enhancing recombination. A device simulation verified that a higher spatial resolution could be obtained by adjusting the gap between the modulated and constant light. It was also found that a higher intensity and a longer wavelength of constant light was more effective. However, there exists a tradeoff between the spatial resolution and the amplitude of the photocurrent, and thus, the signal-to-noise ratio. A tilted incidence of constant light was applied, which could achieve even higher resolution with a smaller loss of photocurrent.
Author: | Yuanyuan Guo, Kosuke Seki, Ko-ichiro Miyamoto, Torsten WagnerORCiD, Michael Josef SchöningORCiD, Tatsuo Yoshinobu |
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DOI: | https://doi.org/10.1016/j.proeng.2014.11.369 |
ISSN: | 1877-7058 |
Parent Title (English): | Procedia Engineering |
Publisher: | Elsevier |
Place of publication: | Amsterdam |
Document Type: | Article |
Language: | English |
Year of Completion: | 2014 |
Tag: | Light-addressable Potentiometric Sensor; novel photoexcitation method; spatial resolution; tilted constant illumination |
Volume: | 87 |
First Page: | 456 |
Last Page: | 459 |
Note: | EUROSENSORS 2014 ; European Conference on Solid-State Transducers <28, 2014> |
Link: | https://doi.org/10.1016/j.proeng.2014.11.369 |
Zugriffsart: | weltweit |
Institutes: | FH Aachen / Fachbereich Medizintechnik und Technomathematik |
collections: | Verlag / Elsevier |
Open Access / Gold | |
Licence (German): | ![]() |