A theoretical approach for a new design of an ultrasensitive angular plasmonic chemical sensor using black phosphorus and aluminum oxide architecture

Abdulkarem H M Almawgani; Suneet Kumar Awasthi; Ahmed Mehaney; Ghassan Ahmed Ali; Hussein A Elsayed; Hassan Sayed; Ashour M Ahmed

doi:10.1039/d3ra01984e

A theoretical approach for a new design of an ultrasensitive angular plasmonic chemical sensor using black phosphorus and aluminum oxide architecture

RSC Adv. 2023 May 30;13(24):16154-16164. doi: 10.1039/d3ra01984e.

Authors

Abdulkarem H M Almawgani¹, Suneet Kumar Awasthi², Ahmed Mehaney³, Ghassan Ahmed Ali⁴, Hussein A Elsayed³, Hassan Sayed³, Ashour M Ahmed^{3

5}

Affiliations

¹ Electrical Engineering Department, College of Engineering, Najran University Najran Kingdom of Saudi Arabia.
² Department of Physics and Material Science and Engineering, Jaypee Institute of Information Technology Noida 201304 U.P. India.
³ Physics Department, Faculty of Science, Beni-Suef University Beni-Suef 62512 Egypt drhussien85sc@gmail.com.
⁴ Information Systems Department, College of Computer Sciences and Information Systems, Najran University Najran Saudi Arabia.
⁵ Physics Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU) Riyadh 11623 Saudi Arabia.

Abstract

In this study, the biosensing capabilities of conventional and hybrid multilayer structures were theoretically examined based on surface plasmon resonance (SPR). The transfer matrix method is adopted to obtain the reflectance spectra of the hybrid multilayer structure in the visible region. In this regard, the considered SPR sensor is configured as, [prism (CaF₂)/Al₂O₃/Ag/Al₂O₃/2D material/Al₂O₃/Sensing medium]. Interestingly, many optimization steps were conducted to obtain the highest sensitivity of the new SPR biosensor from the hybrid structure. Firstly, the thickness of an Al₂O₃ layer with a 2D material (Blue P/WS₂) is optimized to obtain an upgraded sensitivity of 360° RIU^-1. Secondly, the method to find the most appropriate 2D material for the proposed design is investigated to obtain an ultra-high sensitivity. Meanwhile, the inclusion of black phosphorus (BP) increases the sensor's sensitivity to 466° RIU^-1. Thus, black phosphorus (BP) was obtained as the most suitable 2D material for the proposed design. In this regard, the proposed hybrid SPR biosensing design may pave the way for further opportunities for the development of various SPR sensors to be utilized in chemical and biomedical engineering fields.