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Sinusoidal gold corrugation based plasmonic fiber-optic nano-tip refractive index sensor

D. KUMAR1,2, J. B. MAURYA1,* , R. RANJAN1

Affiliation

  1. Department of Electronics and Communication Engineering, National Institute of Technology Patna, Bihar, 800005, India
  2. Department of Electronics and Communication Engineering, Graphic Era Hill University, Dehradun, Uttarakhand, 248002, India

Abstract

The Fiber-tip is layered by a gold sinusoidal corrugation which generates surface plasmons at metal-sample interface. At the optimized corrugation parameters, the performance parameters viz. shift in resonance wavelength, bandwidth, minimum reflectance, sensitivity, propagation length, and maximum field at metal-sample interface are calculated for each of the nine windows lying between 400–800 nm. ∆λ or sensitivity increases with the windows of higher frequency. Analysis suggests that sensor is best suited for last window, i.e., ~720 nm to ~760 nm with maximum sensitivity of 533 nm/RIU. The non-decaying field in sample enables the proposed sensor for deep analyte sensing.

Keywords

Corrugation, Fiber-tip, Gold, Multiband, Refractive index, Sensitivity, Sensor, Surface plasmon.

Citation

D. KUMAR, J. B. MAURYA, R. RANJAN, Sinusoidal gold corrugation based plasmonic fiber-optic nano-tip refractive index sensor, Optoelectronics and Advanced Materials - Rapid Communications, 19, 9-10, September-October 2025, pp.404-411 (2025).

Submitted at: May 25, 2025

Accepted at: Oct. 10, 2025