High performance for refractive index sensors via symmetry-protected guided mode resonance

The symmetry breaking in a typical dielectric GMR-grating structure allows the coupling of the incident wave with the so-called Symmetry-Protected Modes (SPM). In this present work, the excitation conditions of such particular modes are investigated. A parametric study including the grating dimensio...

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Bibliographic Details
Published in:Optics express 2021-07, Vol.29 (14), p.21199-21211
Main Authors: Mesli, Sabrina, Yala, Hakim, Hamidi, Mahdi, BelKhir, Abderrahmane, Baida, Fadi Issam
Format: Article
Language:English
Subjects:
Optics
Physics
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Summary:The symmetry breaking in a typical dielectric GMR-grating structure allows the coupling of the incident wave with the so-called Symmetry-Protected Modes (SPM). In this present work, the excitation conditions of such particular modes are investigated. A parametric study including the grating dimensions is carried out to exploit them for a blood refractive index sensing with higher Sensitivity ( S ) and Figure Of Merit (FOM). To our knowledge, the performances obtained by FDTD calculations ( Q = 2.1 × 10 4 , S = 657 nm/RIU and FOM ≃ ~9 112 RIU −1 ) and FMM calculations ( Q = 3 × 10 6 , S = 656 nm/RIU and FOM ≃ ~1.64 × 10 6 RIU −1 ) are the highest level reached.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.424930