Nanophotonic Device Based on Fano Resonance in Engineered Slot Waveguide for Optical Detection of Viral Infections

A nanophotonic biosensing platform based on an engineered slot waveguide is proposed. The proposed device is based on Fano resonance which consists of a periodic arrangement of two rows of nano-disks and rectangular grating. The periodically arranged nano-disk structure in the form of engineered slo...

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Bibliographic Details
Published in:IEEE sensors journal 2021-02, Vol.21 (3), p.2805-2812
Main Authors: Sulabh, Singh, Lalit, Jain, Sourabh, Kumar, Mukesh
Format: Article
Language:English
Subjects:
Biomedical optical imaging
biosensing
Disks
Fano resonance
Figure of merit
Gratings
Hepatitis B
label-free viral infection detection
Morphology
optical biosensor
Optical refraction
Optical sensors
Optical surface waves
Optical variables control
Optical waveguides
Refractivity
Slot waveguide
Viral infections
Waveguides
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Summary:A nanophotonic biosensing platform based on an engineered slot waveguide is proposed. The proposed device is based on Fano resonance which consists of a periodic arrangement of two rows of nano-disks and rectangular grating. The periodically arranged nano-disk structure in the form of engineered slot waveguide provides enhanced light-matter interaction and easy accommodation of bio-samples. The surface morphology of (3-Aminopropyl) trimethoxysilane (APTMS) as a functionalized layer on the silicon surface is experimentally analyzed. The proposed sensor device can detect very small refractive index change of 0.0008. Based on refractive index sensing, the device numerically exhibits a high sensitivity of 1463 nm/RIU for some viral infections including hepatitis B the with a Figure of Merit (FOM) of 471 for refractive index change of 0.02. The limit of detection for the proposed device is 1.02×10 -3 RIU (Refractive Index Unit). The proposed scheme with Fano like resonance spectrum carries a great potential for on-chip and off-chip nanoscale optical devices and sensors.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2020.3023146