Abstract
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-Hänchen 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-Hänchen shift sensitivity receives four times enhancement in comparison with the conventional bare gold sensing substrate. There is a linear range of Goos-Hänchen 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 × 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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Funding
This work is supported by the National Natural Science Foundation of China (grant no. 11304070), the Singapore National Research Foundation and French National Research Agency grant NRF2017–ANR002 2DPS, China Scholarship Council.
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Guo, Y., Singh, N.M., Das, C.M. et al. Two-dimensional PtSe2 Theoretically Enhanced Goos-Hänchen Shift Sensitive Plasmonic Biosensors. Plasmonics 15, 1815–1826 (2020). https://doi.org/10.1007/s11468-020-01204-9
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DOI: https://doi.org/10.1007/s11468-020-01204-9