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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 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.

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This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant Number 103.03-2018.351.

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Correspondence to Tan Tai Nguyen.

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Van Sau, N., Ngo, Q.M., Phan, T.B. et al. Optical Biosensor Using Near Infrared Laser for Enhancement of Detection Accuracy. Journal of Elec Materi 49, 7420–7426 (2020).

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  • Detection accuracy
  • optical sensor
  • penetration depth
  • sensitivity
  • surface plasmon resonance