fa Design and Analysis of Graphene Based SPR Biosensor Using Ellipsometry Method تخصصی Special پژوهشي Research 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.<br> &nbsp; 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.<br> &nbsp; surface plasmon resonance, graphene, transition metal dichalcogenides (TMD), Ellipsometry surface plasmon resonance, graphene, transition metal dichalcogenides (TMD), Ellipsometry 148 150 http://opsi.ir/browse.php?a_code=A-10-1-2261&slc_lang=fa&sid=1 Mohammad Javad Haji Najafi Mohammad Javad Haji Najafi 10031947532846009288 10031947532846009288 No Optoelectronic and Nanophotonic Research Group, Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran Optoelectronic and Nanophotonic Research Group, Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran Bita Saadatmand Bita Saadatmand 10031947532846009289 10031947532846009289 No Optoelectronic and Nanophotonic Research Group, Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran Optoelectronic and Nanophotonic Research Group, Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran Vahid Ahmadi Vahid Ahmadi 10031947532846009290 10031947532846009290 Yes Optoelectronic and Nanophotonic Research Group, Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran Optoelectronic and Nanophotonic Research Group, Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran S. Mehri Hamidi S. Mehri Hamidi 10031947532846009291 10031947532846009291 No Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran