Theoretical analysis of sensitivity enhancement of surface plasmon resonance biosensor with zinc oxide and blue phosphorus/MoS2 heterostructure

In this paper, an ultrasensitive surface plasmon resonance (SPR) biosensor structure (CaF2 Prism /ZnO/Au/BlueP-MoS2/Sensing medium) based on angular interrogation technique has been studied to see the effect of Blue Phosphorus/MoS2 heterostructure with an adhesive layer of zinc oxide (ZnO). The adhe...

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Bibliographic Details
Published in:Optik (Stuttgart) Vol. 244; p. 167618
Main Authors: Singh, Sachin, Sharma, Anuj K., Lohia, Pooja, Dwivedi, D.K.
Format: Journal Article
Language:English
Published: Elsevier GmbH 01.10.2021
Subjects:
Biosensor
Heterostructure
Limit of detection
Sensitivity
TM field
Zinc oxide
Limit of detection
Heterostructure
Zinc oxide
Sensitivity
Biosensor
TM field
ISSN:0030-4026, 1618-1336
Online Access:Get full text
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Summary:In this paper, an ultrasensitive surface plasmon resonance (SPR) biosensor structure (CaF2 Prism /ZnO/Au/BlueP-MoS2/Sensing medium) based on angular interrogation technique has been studied to see the effect of Blue Phosphorus/MoS2 heterostructure with an adhesive layer of zinc oxide (ZnO). The adhesive layer is ZnO used between calcium fluoride (CaF2) prism and gold (Au) layer. Transfer matrix method is used for numerical analysis at operating wavelength 633 nm. The layers ZnO and Blue Phosphorus/MoS2 heterostructure are optimized to achieve the maximum sensitivity with minimum reflectance. The performance parameters, such as sensitivity (2280RIU−1), quality factor (56.211RIU−1), detection accuracy (0.2810), full width at half maximum (4.0561), and limit of detection (4.3859 × 10−6) are calculated for proposed SPR biosensor at room temperature. For two layers of BlueP/MoS2 heterostructure, the maximum sensitivity is 2350RIU−1. The result shows that the sensitivity of proposed structure is 17.5% greater as compared to the conventional structure. Transverse magnetic (TM) field is plotted, and the value of penetration depth is calculated as 145.25 nm for proposed SPR sensor. The proposed SPR sensor could be very useful in the SPR chip to detect biomolecules or analyte in visible range.
ISSN:0030-4026
1618-1336
DOI:10.1016/j.ijleo.2021.167618