https://doi.org/10.1140/epjp/s13360-022-02867-5
Regular Article
Bio-medical sensing by ultra-high quality-factor/modal-volume (Q/V) multi-slotted SOI Bragg grating cavity
1
Department of Physics, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran
2
Independent Researcher, Zahedan, Iran
Received:
30
December
2021
Accepted:
23
May
2022
Published online:
1
June
2022
Analyzing and decoding stored information in human DNA has enabled ultra-sensitive photonic type sensors based on the state-of-the-art method to detect many specific physical and mental illnesses that were virtually impossible or very difficult for physicians and psychiatrists to be diagnosed until recently. In this paper, we proposed and simulated a multi-slotted silicon-on-insulator Bragg grating cavity (MS-SOI-BGC) based on photonic material structure, which is capable of confining and intensifying the specified sensing modes in the air-gap areas as well as the center of the cavity with extremely high quality (Q) factor, Q = 4.05 × 108, and very small modal volume Vmode = 0.0081(λres/nSi)3, working at the wavelength λres ≈ 1620 nm. These modes are used as sensing modes in the proposed structure, which provides very effective interaction circumstances between electromagnetic fields of the resonant modes and analyte materials, e.g. DNA molecules, thus granting a very suitable platform for obtaining an ultra-sensitive biomedical sensor. The analysis of the computational results achieved by the finite element method (FEM) shows that the proposed sensor is very sensitive to biological analytes as it can detect nanometer layers of DNA molecules with sensitivities as high as Ssurf ≈ 1.93 nm−1 (for the multi-slot channel -MSC- port sensor design) and Sc ≈ 933.08 nm/RIU (for the microcavity channel -MCC- port sensor design). In addition, the sensing operation can be performed in an extensive range of wavelengths as wide as 750 nm through adjusting the parameters of the proposed structure and utilizing a very wide photonic bandgap (PBG).
The original online version of this article was revised: In this article the affiliation detail for Sara Hassani was incorrect; it should have been ‘Indepdent Researcher’. The original article has been corrected.
A correction to this article is available online at https://doi.org/10.1140/epjp/s13360-023-04623-9.
Copyright comment corrected publication 2023
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022. corrected publication 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
