Sensitivity enhancement of biosensor (SPR) with PtSe2 using Au–Si–Au thin films

H. Bouandas, Y. Slimani, K. Ayadi, M. A. Ghebouli, A. Djemli, M. Fatmi, T. Chihi, Munirah D. Albaqami, Saikh Mohammad, Mika Sillanpää

Research output: Contribution to journalArticlepeer-review


In this study, we presented a novel structure for a highly sensitive surface plasmon resonance (SPR) sensor, we propose a structure which contains six layers: BK7 prism glass, Gold thin film, Silicon sheets, Gold thin film, using transition figure of merit (FOM) 16.43 RUI−1metal dichalcogenides 2D PtSe2 layer and sample medium. We have been optimizing the thickness of each layer. The highly performance parameters in this biosensor structure are provided in terms of sensitivity(S), detection accuracy (DA), quality factor (QF) and figure of merit (FOM). Here, the addition of the hybrid Silicon—PtSe2 layer between two gold films increased the sensitivity, but we observed the (DA) and (QF) is decreased. We find the full at half maximum also decreased. We investigated the effect of gold thickness. The maximum sensitivity 200°/RIU and is gained with 35 nm Gold film, 5 nm thickness Silicon and 2 nmPtSe2 layer, we can be obtained also the configuration with 60 nm Gold thin film and 3 nm thickness Silicon (6 layer) delivers a maximum sensitivity (S) of 206°/RIU with figure of merit (FOM) of 24.03 RUI−1.Our novel structure is optimized for a highly sensitive surface plasmon resonance (SPR) sensor.

Original languageEnglish
JournalJournal of Optics (India)
Publication statusAccepted/In press - 2024
Externally publishedYes


  • Biosensor
  • PtSe2
  • Sensitivity
  • Silicon
  • Surface plasmon resonance
  • Thickness optimization

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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