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Metallic nano rods loaded plasmonics resonator for improved sensing performance

RUKHSAR ZAFAR1,* , YAZUSHA SHARMA1,2, GHANSHYAM SINGH3, MOHAMMAD SALIM3

Affiliation

  1. Department of Electronics and Communication Engineering, Swami Keshvanand Institute of Technology, Management and Gramothan, Jaipur, India
  2. Department of Electronics and Communication Engineering, Jaipur Engineering College and Research Centre, Jaipur, India
  3. Department of Electronics and Communication Engineering, Malviya National Institute of Technology, Jaipur, India

Abstract

A compact and highly sensitive refractive index sensor based on square metallic nano-rods loaded Plasmonics resonator is proposed. Due to the presence of nano-rods in the resonator, the resonance is red shifted. Thus, offering a quite simple way for resonance shifting without any significant increase in the footprint. Based on this fascinating behavior, the proposed structure is tested for the sensing application. The high value of sensitivity per refractive index unit is obtained, which can be further improved by incorporating Dual Resonators with Nano-Metallic Rods (DRMNR). Due to interaction between both nano-rods embedded resonators, the symmetrical nature of resonance is altered and an asymmetrical resonance profile is emerged known as Fano resonance. Two narrow peaks with line-width = 8 nm and 17 nm respectively, are observed in resonance profile. DRMNR offers a high value of sensitivity ( ) and Figure of Merit (FOM=220) which are good measures of sensing performance. Therefore, the device paves the way to be integrated as an on-chip optical sensor for detecting bio-molecule and chemical gases.

Keywords

Metallic nano-rods, Footprint, Fano resonance, Sensitivity and Figure of Merit.

Citation

RUKHSAR ZAFAR, YAZUSHA SHARMA, GHANSHYAM SINGH, MOHAMMAD SALIM, Metallic nano rods loaded plasmonics resonator for improved sensing performance, Optoelectronics and Advanced Materials - Rapid Communications, 17, 7-8, July-August 2023, pp.272-277 (2023).

Submitted at: Jan. 10, 2023

Accepted at: Aug. 7, 2023