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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 22:11 |
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Conference: Bucharest University Faculty of Physics 2021 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Development of a numerical algorithm for surface plasmon resonance based optical sensors on waveguide configuration
Authors:
Ioana KUNCSER(1,2), Gabriel SOCOL(1) and Iulia ANTOHE(1)
Affiliation:
1)National Institute for Lasers, Plasma and Radiation Physics, Bucharest-Magurele, Romania
2)Bucharest University, Faculty of Physics, 077125, Bucharest-Magurele, Romania
E-mail
ioana_kuncser@yahoo.com
Keywords:
waveguide, optical sensor, surface plasmon resonance, refractive index
Abstract:
One of the most sensitive optical techniques for determining in real time tinny changes in the refractive index of an analyte is based on the surface plasmon resonance effect. The method consists in tracking the intensity of the evanescent wave coming from a highly conductive metallic layer in direct contact with the investigated analyte and is very suitable for following chemical and bio-medical [1] processes. Either the incidence angle or the wavelength/frequency of the incident wave can be tuned in order to approach the plasmon frequency in the conductive metallic layer modulated by the refractive index of the analyte (coupling condition). The most common configurations for surface plasmon resonance sensors (Kretschmann configuration using a prism and respectively optical fiber [2] as waveguides) are considered herein. The algorithm providing the evolution of the intensity in the light totally reflected on a metallic film in contact with an analyte will be discussed in this work. The corresponding simulations performed in case of a convenient waveguide covered by a nanometer thick metal layer in contact with the analyte provide quantitative information on the shift of the absorption peak versus the angle of incidence (at constant wavelength) and versus the wavelength (at constant incidence angle). Experimental data (resonant wavelengths) obtained with an optical fiber based sensor covered by a 40 nm thick Au layer and with the incident radiation entering the fiber at constant angle are verified for calibration analytes consisting in different sucrose solutions.
References:
[1]Ronald Lee Earp Jr. "Multiwavelength Surface Plasmon Resonance Sensor
Designs for Chemical and Biochemical Detection"
[2]Elton B. Costa, Eliose P. Rodrigues, Helder A. Pereira, Iulia Antohe and Gabriel Socol "Sim-SPR: An Open-Source Simulator Applied to Design Performant Optical Fiber based Surface Plasomon Resonance Sensors
Acknowledgement:
This work was financially supported by the National Authority for Research and Innovation in the frame of Nucleus Programme - LAPLAS VI (contract 16N/08.02.2019) and by the Executive Agency for Higher Education, Research, Development and Innovation (UEFISCDI) funding, Project PD 195/2020 (PN-III-P1-1.1-PD-2019-0466).
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