Journal
PLASMONICS
Volume 15, Issue 6, Pages 1815-1826Publisher
SPRINGER
DOI: 10.1007/s11468-020-01204-9
Keywords
Surface plasmon resonance; Plasmonic biosensor; Goos-Hanchen shift; Sensitivity; Platinum diselenide
Funding
- National Natural Science Foundation of China [11304070]
- Singapore National Research Foundation
- French National Research Agency [NRF2017-ANR002 2DPS]
- China Scholarship Council
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Platinum diselenide (PtSe2), an emerging two-dimensional transition metal dichalcogenide, exhibits thickness-dependent refractive index, and hence, intriguing optical properties. Here, we employ it as a plasmonic sensing substrate to achieve significant enhancement in Goos-Hanchen shift sensitivity. Through systematic optimization of all parameters, four optimum sensing configurations have been achieved at different wavelengths ranging from visible to near-infrared region, where the Goos-Hanchen shift sensitivity receives four times enhancement in comparison with the conventional bare gold sensing substrate. There is a linear range of Goos-Hanchen shift with the tiny change of refractive index for each optimal configuration. The detection limit of the refractive index change can be as low as 5 x 10(-7) RIU which is estimated to be lower by 2 orders of magnitude, and the corresponding sensitivity of biomolecules has a 1000-fold increment compared with that of bare gold-based sensors.
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