New demodulation technique based on spectral envelopes intersection for plasmonic fiber grating sensors

Maxime Lobry; Hadrien Fasseaux; Médéric Loyez; Karima Chah; Erik Goormaghtigh; Francesco Baldini; Ruddy Wattiez; Christophe Caucheteur; Francesco Chiavaioli

doi:10.1117/12.2621231

17 May 2022 New demodulation technique based on spectral envelopes intersection for plasmonic fiber grating sensors

Maxime Lobry, Hadrien Fasseaux, Médéric Loyez, Karima Chah, Erik Goormaghtigh, Francesco Baldini, Ruddy Wattiez, Christophe Caucheteur, Francesco Chiavaioli

Author Affiliations +

Proceedings Volume 12139, Optical Sensing and Detection VII; 121390X (2022) https://doi.org/10.1117/12.2621231
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Gold-coated tilted fiber Bragg gratings (TFBGs) have been extensively studied over the past years, particularly for biosensing purposes. Surface Plasmon Resonance (SPR) is generated through the deposition of a gold layer of appropriate thickness onto the grating region. The combination of SPR and TFBG permits to create a comb-like spectrum of narrow-band cladding mode resonances, which is usually demodulated by tracking the change of optical features of a selected peak. Here, for the first time to the best of our knowledge, a twenty-fold more sensitive demodulation technique based on the intersection of the upper and lower envelopes of gold-coated TFBG spectra is presented. This method has been successfully applied in biosensing for the detection of HER2 (Human Epidermal Growth Factor Receptor-2) proteins, a crucial breast cancer biomarker. Some practical improvements have also been proposed and assessed: first, a uniform FBG has been superimposed on the TFBG to reduce the read-out wavelength span to 10 nm instead of 70 nm, while keeping the temperature-compensated measurements; second, a microfluidic system has been designed and integrated to inject the samples towards the sensor at controlled flow rates. All these novelties make this sensing platform even more attractive and promising for use in practical applications.

Conference Presentation

Citation Download Citation

Maxime Lobry, Hadrien Fasseaux, Médéric Loyez, Karima Chah, Erik Goormaghtigh, Francesco Baldini, Ruddy Wattiez, Christophe Caucheteur, and Francesco Chiavaioli "New demodulation technique based on spectral envelopes intersection for plasmonic fiber grating sensors", Proc. SPIE 12139, Optical Sensing and Detection VII, 121390X (17 May 2022); https://doi.org/10.1117/12.2621231

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