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Optical Bio-sensing with an Asymmetric Hybrid Plasmonic Mach-Zehnder Interferometer

Ghosh, S. ORCID: 0000-0002-1992-2289 & Rahman, B. M. ORCID: 0000-0001-6384-0961 (2019). Optical Bio-sensing with an Asymmetric Hybrid Plasmonic Mach-Zehnder Interferometer. Journal of Physics: Conference Series, 1151(1), doi: 10.1088/1742-6596/1151/1/012012


A silicon (Si) suspended metal strip loaded hybrid plasmonic waveguide is designed and optimized to obtain a high waveguide sensitivity for bio-sensing applications. The waveguide forms a horizontal slot which confines a high ∼59% power with the optimized design parameters. Any liquid refractometric changes can be detected by this waveguide and its quasi-TM waveguide sensitivity shows a very high value of >1. Finally, an asymmetric Mach-Zehnder interferometer (AMZI) is designed to detect a small refractometric change in terms of interferometric fringe shift. Our proposed design exhibits a high refractometric sensitivity of > 400 nm/RIU. The AMZI is then considered to use for an accurate detection of haemoglobin (Hb) concentration of human whole blood. This ex vivo detection process exhibits a promising device sensitivity of -781.05 pm/g/dl with a detection limit of 1.3 mg/dl which makes this device useful for a precise detection of anaemic status of a patient.

Publication Type: Article
Additional Information: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments: School of Science & Technology > Engineering
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