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year 27, Issue 1 (Iranian Nano-Photonic Conference 2020 2020)
ICOP & ICPET _ INPC _ ICOFS 2020, 27(1): 148-150 |
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Haji Najafi M J, Saadatmand B, Ahmadi V, Hamidi S M. Design and Analysis of Graphene Based SPR Biosensor Using Ellipsometry Method. ICOP & ICPET _ INPC _ ICOFS 2020; 27 (1) :148-150
URL: http://opsi.ir/article-1-2282-en.html
URL: http://opsi.ir/article-1-2282-en.html
1- Optoelectronic and Nanophotonic Research Group, Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran
2- Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran
2- Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran
Abstract: (1120 Views)
Two-dimensional nanomaterials have attracted increasing attention for enhancing surface plasmon resonance (SPR) biosensors application. In this work, we use the graphene layer to improve the sensitivity of the SPR biosensors based on conventional Kretschmann configuration. We employ WS2 and MoS2 2D materials as an interlayer to enhance the sensitivity of Au/Graphene biosensor in angle interrogation method. Transfer matrix method (TMM) is used to analyze the characteristics of the device. Results show that using WS2 in Au/Graphene structure increases sensitivity about 12.64%, which is higher than MoS2. Combining graphene based SPR and ellipsometry as a highly sensitive, label-free, real-time, and versatile method can be used to measure a very small concentration of biomolecules which leads to 170-fold enhancement compared to angle interrogation method.
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