Bragg grating based nanophotonic biochemical sensor with enhanced light matter interaction

Ibrar Jahan M.A.; Muniswamy V.; Rodriguez C.; Honnungar R.V. · Optoelectronics and Advanced Materials, Rapid Communications (2023)

Resumen

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.

Instituciones: Universidad Nacional Mayor de San Marcos