Journal
BIOSENSORS-BASEL
Volume 12, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/bios12080582
Keywords
surface plasmon resonance; transitionmetal dichalcogenides; MoS2; sensitivity enhancement
Funding
- Ministry of Science and Higher Education of the Russian Federation [0714-2020-0002]
- Russian Foundation for Basic Research [20-07-00840]
- Scholarship of the President of the Russian Federation for young scientists [SP-1125.2021.5]
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This study systematically analyzes the optical sensitivity of an SPR biosensor platform with auxiliary layers of MoS2. The exciton-driven dielectric response of MoS2 and its anisotropy affect the sensitivity characteristics, especially in the near-infrared spectral range.
The use of ultra-thin spacer layers above metal has become a popular approach to the enhancement of optical sensitivity and immobilization efficiency of label-free SPR sensors. At the same time, the giant optical anisotropy inherent to transition metal dichalcogenides may significantly affect characteristics of the studied sensors. Here, we present a systematic study of the optical sensitivity of an SPR biosensor platform with auxiliary layers of MoS2. By performing the analysis in a broad spectral range, we reveal the effect of exciton-driven dielectric response of MoS2 and its anisotropy on the sensitivity characteristics. The excitons are responsible for the decrease in the optimal thickness of MoS2. Furthermore, despite the anisotropy being at record height, it affects the sensitivity only slightly, although the effect becomes stronger in the near-infrared spectral range, where it may lead to considerable change in the optimal design of the biosensor.
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