Optical Biosensor Using Near Infrared Laser for Enhancement of Detection Accuracy

This work presents the figures of merit of an optical sensor using a prism based on surface plasmon resonance (SPR). A combination of a prism coated with a thin Ag layer and a wavelength of 1064 nm was used for SPR excitation. The simulated results showed that the sensor coated with a Ag layer of 60...

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Bibliographic Details
Published in:Journal of electronic materials 2020-12, Vol.49 (12), p.7420-7426
Main Authors: Van Sau, Nguyen, Ngo, Quang Minh, Phan, Thang Bach, Tran, Ngoc Quyen, Nguyen, Tan Tai
Format: Article
Language:English
Subjects:
Accuracy
Biosensors
Characterization and Evaluation of Materials
Chemistry and Materials Science
Electronics and Microelectronics
Infrared lasers
Instrumentation
Materials Science
Optical and Electronic Materials
Optical measuring instruments
Penetration depth
Q factors
Sensors
Silver
Solid State Physics
Target detection
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Summary:This work presents the figures of merit of an optical sensor using a prism based on surface plasmon resonance (SPR). A combination of a prism coated with a thin Ag layer and a wavelength of 1064 nm was used for SPR excitation. The simulated results showed that the sensor coated with a Ag layer of 60 nm yielded good response with a detection accuracy of 14 times that obtained using a wavelength of 633 nm. The sensor using a wavelength of 1064 nm showed a quality factor of around 1027.4/° and a penetration depth of 384.4 nm, which were 9.3 times and 3.5 times better, respectively, than those obtained when using a wavelength of 633 nm. The enhancement of the detection accuracy and the penetration depth of the sensor using a wavelength of 1064 nm offer advantages for the detection of bio-targets in biomedical and food applications.
ISSN:0361-5235
1543-186X
DOI:10.1007/s11664-020-08384-4