New Biosensor Design Based on Photonic Crystal Core-shell Rods Defects for Detecting Glucose Concentration

Authors A. Labbani , B. Tebboub

Laboratory of Hyperfrequency and Semiconductors, Department of Electronics Faculty of Technology Sciences, University of Mentouri brothers Constantine, 1, Constantine, Algeria

Issue Volume 12, Year 2020, Number 1
Dates Received 26 November 2019; revised manuscript received 15 February 2020; published online 25 February 2020
Citation A. Labbani, B. Tebboub, J. Nano- Electron. Phys. 12 No 1, 01002 (2020)
PACS Number(s) 42.70.Qs, 42.79.Gn
Keywords Photonic crystal, Glucose concentration, Biosensor (5) , Resonant microcavity, Sensitivity (11) .

In this paper, an ultra compact photonic crystal (PhC) biosensor for detecting glucose concentration using resonant microcavity (RMC), sandwiched by two inline quasi-waveguides is investigated. The RMC is used as sensing region. It consisted of 77 core/shell (C/S) rod defects and 14 functionalized holes. The basic structure is formed by air holes arranged in hexagonal lattice in silicon (Si) background. The sensing mechanism of our biosensor is to detect the resonant wavelength shift, which is caused by the change of the refractive index (RI) of the shell layer and active holes filled with the analyte sample of glucose solution. The plane wave expansion (PWE) and finite difference time domain (FDTD) methods are chosen to analyze and simulate the performance of the suggested structure. The FDTD results reveal high sensitivity of 624.7904 nm/RIU with high linearity and quality factor. The presented sensor has a simple design and is easy to manufacture. In addition, the total size of the presented device is 92.65 m2 which is very small for nanotechnology based sensing.

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