Refractive Index Sensing and Label-Free Detection Employing Oval Resonator Structured Plasmonic Sensor

Authors A. Harhouz1 , A. Hocini1 , H. Tayoub1,2

1Laboratoire d’Analyse des Signaux et Systmes, Department of Electronics, University of MSila, P.O. BOX. 166, Route Ichebilia, Msila 28000, Algeria

2Research Center in Industrial Technologies CRTI, P.O. BOX. 64, Cheraga 16014, Algiers, Algeria

Issue Volume 14, Year 2022, Number 1
Dates Received 21 January 2022; revised manuscript received 20 February 2022; published online 28 February 2022
Citation A. Harhouz, A. Hocini, et al., J. Nano- Electron. Phys. 14 No 1, 01012 (2022)
PACS Number(s) 42.81.Pa
Keywords Fano resonance, Plasmonic RI sensor, MIM waveguide, FDTD (3) , Oval resonator.

Plasmonics is a young area of nano-optics research. Owing to its ability to produce nanoscale hot spots, which are close to the size of bioparticles, it has been largely applied in biodetection with enhanced matter/light interactions and heightened sensitivity to refractive index (RI) changes. In this manuscript, we propose a miniature plasmonic RI sensor with high detection performances. Our proposed plasmonic RI sensor based on Fano resonances in a metal-insulator-metal (MIM) waveguide with a nanowall coupled with an oval resonator is presented in this work. The spectral characteristics and the transmission properties of the sensor are extensively analyzed using the finite difference time-domain (FDTD) method. The proposed sensor proves to be highly sensitive for label-free detection with an optimum design. FDTD simulations show that RI sensitivity values can be as high as 3787.9 nm per refractive index unit (RIU).

List of References