Vol. 32 No. 3 (2022)

Near Infrared Metal-insulator-metal Surface Plasmon Resonances for Refractive Index Sensors

Cam Thi Hong Hoang
University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology of Vietnam, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
Tuan Minh Ha
University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
Van Dai Pham
Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
Quang Minh Ngo
University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam

Published 27-03-2022

How to Cite

Hoang, C. T. H., Ha, T. M., Pham, V. D., & Ngo, Q. M. (2022). Near Infrared Metal-insulator-metal Surface Plasmon Resonances for Refractive Index Sensors. Communications in Physics, 32(3), 275. https://doi.org/10.15625/0868-3166/16541


This work reports the optical properties of surface plasmon resonance (SPR) based on the metal-insulator-metal (MIM) structure towards a refractive index sensor. The MIM-SPR structure operating near infrared region consists of lateral periodicity of subwavelength gold patterns placed on a stack of thin silica spacer and silver film (acting as a reflector) on a silicon substrate. The reflection spectra and the electric field distributions of MIM-SPR structures can be tuned by modifying the geometrical properties and have been numerically investigated by using Lumerical’s finite-difference time-domain (FDTD) solutions. The square lattice configuration of 1200 nm to 1400 nm pitch of gold micro-disks of thickness from 80 nm to 120 nm have been conducted. The size of these considered gold patterns, i.e., the diameter of the micro-disks is in the range of 900 nm to 1000 nm. The proposed MIM-SPR structure possessing sensitivity of 370 nm per refractive index unit (RIU), can be applicable for a wide variety of plasmonic sensing, in particular for refractometric biosensors.


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