Simulation of Localized Surface Plasmon Resonance of Silver Nanoparticles with Graphene Coating Utilizing Maxwell-Garnett Theory

Authors Kavita, R.K. Verma

Department of Physics, Central University of Rajasthan, NH-8 Bandarsindri, Ajmer 305817, Rajasthan, India

Issue Volume 13, Year 2021, Number 2
Dates Received 11 January 2021; revised manuscript received 24 March 2021; published online 09 April 2021
Citation Kavita, R.K. Verma, J. Nano- Electron. Phys. 13 No 2, 02022 (2021)
PACS Number(s) 81.05.ue, 87.61. – c
Keywords SPR (13) , LSPR, Nanoparticle (77) , Sensor (27) , Graphene (23) .

Surface plasmon resonance (SPR) is an important technique for various optical fiber sensors, biomedical applications, imaging and numerous optical devices. Surface plasmons are the transverse magnetically polarized surface waves generated due to the excitation of surface electrons at the interface of metal and dielectric. The excitation of surface plasmons in metal nanoparticles exhibits a strong absorption band for UV-Visible region which is not present in the spectrum of bulk metal layer. These are called localized surface plasmons (LSPs). LSPs are the collective oscillations of free electron cloud in metal nanoparticles which result in a strong absorption band. When the wavelength of incident light becomes resonant to the wavelength of oscillating free electrons, the phenomenon is termed as localized surface plasmon resonance (LSPR). In the present theoretical work, we have performed simulations using MATLAB to get the extinction (which gives the value of absorption coefficient) cross-section variation with the incident light wavelength for graphene coated silver nanoparticles. In order to get the effective dielectric constant of the proposed structure, analytically, the Maxwell-Garnett (MG) theory has been used.

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