Banca de DEFESA: VALDEMIR MANOEL DA SILVA JUNIOR

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : VALDEMIR MANOEL DA SILVA JUNIOR
DATE: 27/02/2024
TIME: 08:00
LOCAL: Sessão por videoconferência.
TITLE:

MULTIPARAMETER SENSORS USING LOSSY MODE RESONANCE AND SURFACE PLASMON RESONANCE EFFECTS IN D-SHAPED OPTICAL FIBERS.

KEY WORDS:

D-shaped Optical Fiber, Optical Fiber Sensors, Lossy Mode Resonance, Surface Plasmon Resonance.

PAGES: 124
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUMMARY:

This Thesis presents the proposal and characterization of D-shaped optical fiber sensors using the effects of Dissipative Mode Resonance and Surface Plasmon Resonance using the Attenuated Total Reflection method to measure parameters such as corrosion and refractive index through intensity variation. of the light transmitted after passing through D-Shaped with a single low-attenuation wavelength. The performance of the sensors is obtained through analytical and numerical simulations that are in agreement with each other and with experimental results found in the literature. Of the sensor element modeling, three are analytical, all based on Fresnel equations, and two are numerical, obtained using the Finite Element Method through the COMSOL Multiphysics software. The first analytical modeling considers that light is a ray that has a defined angle of incidence within the optical fiber, the second analytical modeling considers that the light has a normal power distribution within the possible range of angles and the third modeling considers that the power of light is distributed in the optical fiber with a Gaussian profile. The first numerical modeling approximates the light in the optical fiber to a beam with a Gaussian profile traveling through a longitudinal section of D-shaped, while the second modeling uses a cross section of D-Shaped to obtain the refractive index of the effective mode of the light that passes through the D-Shaped. Eleven devices are proposed, four of which are corrosion sensors, three are refractive index sensors and four are cascade combinations of sensors, including combinations that simultaneously measure corrosion and refractive index. Among the corrosion sensors, one uses the surface plasmon resonance effect and three use the dissipative resonance mode, while for the refractive index sensors, one uses the surface plasmon resonance and two use the dissipative resonance. For each sensor, the behavior of unpolarized light and transverse magnetic and transverse electrical polarizations is evaluated separately. The results show that, depending on demand, it is possible to obtain sensors with high sensitivity, wide operating range, with or without resonance. The results highlight the potential of using the resonance effect in a dissipative way, individually or together with the surface plasmon resonance effect.

COMMITTEE MEMBERS:
Externa à Instituição - MARIA THEREZA MIRANDA ROCCO GIRALDI - IME
Externo à Instituição - DIEGO JOSÉ RATIVA MILLAN - UPE
Interno - 1131199 - EDUARDO FONTANA
Presidente - 2226204 - JOAQUIM FERREIRA MARTINS FILHO
Interno - 2199776 - RENATO EVANGELISTA DE ARAUJO