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Bimetallic Ag/Au thin films in Kretschmann-based surface plasmon resonance sensor for glucose detection

B. MULYANTI1, C. WULANDARI2, N. R. MOHAMAD3,4, E. RIFALDI1, L. HASANAH2, P. S. MENON3,*

Affiliation

  1. Department of Electrical Engineering Education, Universitas Pendidikan Indonesia (UPI), Jl. Dr. Setiabudhi 207, Bandung 40154, Indonesia
  2. Department of Physics Education, Universitas Pendidikan Indonesia (UPI), Jl. Dr. Setiabudhi 229, Bandung 40154, Indonesia
  3. Institute of Microengineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia (UKM), Bangi, Selangor, 43600, Malaysia
  4. Centre for Telecommunication Research & Innovation (CeTRI), Fakulti Kejuruteraan Elektronik & Kejuruteraan Komputer (FKEKK), Universiti Teknikal Malaysia Melaka (UTeM), Malaysia

Abstract

The surface plasmon resonance (SPR)-based sensor performance was investigated in bimetallic silver/gold (Ag/Au) thin films. This study aims to examine SPR-sensing performance of the various thickness of Ag/Au to obtain the optimum sensitivity and figure-of-merit (FOM) for glucose detection, compared to Au thin films. Finite-Difference-Time-Domain (FDTD) simulation was used to evaluate the Kretschmann configuration in angular interrogation at 633nm wavelength. Bimetallic Ag (30 nm)/ Au (17.5 nm) thin-film gave better sensing performance since the transfer of silver (Ag) electrons to Au increased the density of surface plasmons in the bimetallic structure, shown by FOM and sensitivity value as 0.5173 and 4.7993°/RIU, respectively.

Keywords

SPR glucose sensor, Bimetallic thin-film, Kretschmann configuration, Sensitivity, Figure of merit, Ag/Au.

Citation

B. MULYANTI, C. WULANDARI, N. R. MOHAMAD, E. RIFALDI, L. HASANAH, P. S. MENON, Bimetallic Ag/Au thin films in Kretschmann-based surface plasmon resonance sensor for glucose detection, Optoelectronics and Advanced Materials - Rapid Communications, 14, 11-12, November-December 2020, pp.487-493 (2020).

Submitted at: March 30, 2020

Accepted at: Nov. 25, 2020