Title of article :
Design and Simulation of Graphene/2D Interlayer Surface Plasmon Resonance Biosensor Based on Ellipsometry Method
Author/Authors :
Haji Najafi, Mohammad Javad Optoelectronics and Nanophotonics Research Group - Faculty of Electrical and Computer Engineering - Tarbiat Modares University, Tehran, Iran , Saadatmand, Bita Optoelectronics and Nanophotonics Research Group - Faculty of Electrical and Computer Engineering - Tarbiat Modares University, Tehran, Iran , Ahmadi, Vahid Optoelectronics and Nanophotonics Research Group - Faculty of Electrical and Computer Engineering - Tarbiat Modares University, Tehran, Iran , Hamidi, Mehri Laser and Plasma Research Institute - Shahid Beheshti University, Tehran, Iran
Abstract :
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 the conventional
Kretschmann configuration. We employ Tungsten disulfide (WS2) and Molybdenum
disulfide (MoS2) Two-dimensional materials as
an interlayer to enhance the sensitivity of
Au/Graphene biosensor in angle interrogation
method. The transfer matrix method (TMM) is
used to analyze the characteristics of the device.
Results show that using WS2 in Au/Graphene
structure increases sensitivity by 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 and improves the detection accuracy and quality factor.
Keywords :
Ellipsometry , Graphene , Surface plasmon resonance , Transition metal dichalcogenides (TMD)
Journal title :
International Journal of Optics and Photonics (IJOP)
