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Article

Opto-Electronic Refractometric Sensor Based on Surface Plasmon Resonances and the Bolometric Effect

1
Applied Optics Complutense Group, University Complutense of Madrid, Faculty of Optics and Optometry, Av. Arcos de Jalón 118, 28037 Madrid, Spain
2
Physics Department, Faculty of Science, Minia University, University Campus, El-Minya 61519, Egypt
3
Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, 28933 Madrid, Spain
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(4), 1211; https://doi.org/10.3390/app10041211
Received: 30 December 2019 / Revised: 26 January 2020 / Accepted: 5 February 2020 / Published: 11 February 2020
(This article belongs to the Special Issue Optical Biosensors and Applications)
The bolometric effect allows us to electrically monitor spectral characteristics of plasmonic sensors; it provides a lower cost and simpler sample characterization compared with angular and spectral signal retrieval techniques. In our device, a monochromatic light source illuminates a spectrally selective plasmonic nanostructure. This arrangement is formed by a dielectric low-order diffraction grating that combines two materials with a high-contrast in the index of refraction. Light interacts with this structure and reaches a thin metallic layer, that is also exposed to the analyte. The narrow absorption generated by surface plasmon resonances hybridized with low-order grating modes, heats the metal layer where plasmons are excited. The temperature change caused by this absorption modifies the resistance of a metallic layer through the bolometric effect. Therefore, a refractometric change in the analyte varies the electric resistivity under resonant excitation. We monitor the change in resistance by an external electric circuit. This optoelectronic feature must be included in the definition of the sensitivity and figure of merit (FOM) parameters. Besides the competitive value of the FOM (around 400 RIU 1 , where RIU means refractive index unit), the proposed system is fully based on opto-electronic measurements. The device is modeled, simulated and analyzed considering fabrication and experimental constrains. The proposed refractometer behaves linearly within a range centered around the index of refraction of aqueous media, n 1.33 , and can be applied to the sensing for research in bio-physics, biology, and environmental sciences. View Full-Text
Keywords: plasmonics; nanophotonics; bolometer; transduction plasmonics; nanophotonics; bolometer; transduction
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MDPI and ACS Style

Elshorbagy, M.H.; Cuadrado, A.; Gómez-Pedrero, J.A.; Alda, J. Opto-Electronic Refractometric Sensor Based on Surface Plasmon Resonances and the Bolometric Effect. Appl. Sci. 2020, 10, 1211. https://doi.org/10.3390/app10041211

AMA Style

Elshorbagy MH, Cuadrado A, Gómez-Pedrero JA, Alda J. Opto-Electronic Refractometric Sensor Based on Surface Plasmon Resonances and the Bolometric Effect. Applied Sciences. 2020; 10(4):1211. https://doi.org/10.3390/app10041211

Chicago/Turabian Style

Elshorbagy, Mahmoud H., Alexander Cuadrado, José A. Gómez-Pedrero, and Javier Alda. 2020. "Opto-Electronic Refractometric Sensor Based on Surface Plasmon Resonances and the Bolometric Effect" Applied Sciences 10, no. 4: 1211. https://doi.org/10.3390/app10041211

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