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Bragg grating based nanophotonic biochemical sensor with enhanced light matter interaction

M. A. IBRAR JAHAN1,* , VENKATESHA MUNISWAMY2, CIRO RODRIGUEZ3, RAJINI V. HONNUNGAR1

Affiliation

  1. Department of Electronics and Communication Engineering, RNS Institute of Technology, VTU, Bengaluru, India
  2. Department of Electronics and Communication Engineering, SaiVidya Institute of Technology, VTU, Bengaluru, India
  3. Department of Software Engineering, Universidad Nacional Mayor de San Marcos University Lima, Peru

Abstract

A silicon-based nanophotonic device with increased light-matter interaction is presented for biochemical sensing. This article describes the design of an SOI-based rib waveguide with gratings. Using the Finite-Difference Time-Domain (FDTD) Lumerical tool, a numerical analysis is done to evaluate the sensing capabilities of the proposed photonic biochemical sensor. A gold layer is sandwiched between the upper and lower SiO2 layers. Gratings and the gold reflector layer below the waveguide have increased light-matter interaction resulting in enhanced sensitivity. The sensor is tailored for a 1550 nm operating wavelength. Achieved a high sensitivity of 1160 nm/RIU with a Full Width Half Maxima (FWHM) of 6.8 nm and a Figure of Merit (FOM) of 171/RIU. The proposed sensor has a high sensitivity making it a viable option for various biochemical sensing applications, so the designed sensor is used in the detection of malaria disease.

Keywords

Bragg gratings, Biochemical, Gold layer, Refractive Index, Silicon, Wavelength.

Citation

M. A. IBRAR JAHAN, VENKATESHA MUNISWAMY, CIRO RODRIGUEZ, RAJINI V. HONNUNGAR, Bragg grating based nanophotonic biochemical sensor with enhanced light matter interaction, Optoelectronics and Advanced Materials - Rapid Communications, 17, 3-4, March-April 2023, pp.99-105 (2023).

Submitted at: Dec. 6, 2022

Accepted at: April 7, 2023