2020
Autores
Viveiros, D; De Almeida, JMMM; Coelho, L; Maia, JM; Amorim, VA; Jorge, PAS; Marques, PVS;
Publicação
Optics InfoBase Conference Papers
Abstract
The precise production of 4.5 µm off-axis first order FBG in an SMF-28e fiber through femtosecond laser direct writing is demonstrated. The off-axis FBG potential as sensing head for torsion sensing was successfully explored. © 2021 The Author(s).
2020
Autores
Viveiros, D; Vasconcelos, H; De Almeida, JMMM; Coelho, L; Amorim, VA; Maia, JM; Jorge, PAS; Marques, PVS;
Publicação
Optics InfoBase Conference Papers
Abstract
Optical fiber Mach-Zehnder interferometers were fabricated by combining two TiO2 coated LPFGs fabricated through femtosecond laser direct writing. Results of its refractometric characterization are presented and compared with the single LPFGs sensors. Wavelength sensitivity of 1175 nm/RIU at 1.38 and spectral resolution of 2.2×10-5 were achieved. © 2021 The Author(s).
2020
Autores
Rodrigues, SM; Paiva, JS; Silva, FM; Coelho, L; Marques, PVS; Cunha, JPS; Jorge, PAS;
Publicação
Optics InfoBase Conference Papers
Abstract
Optical tweezers based on metallic-coated tapered optical fibers with an aperture at the apex are fabricated and their sensing ability is tested. Preliminary results show robustness in differentiating between a trapped and no trapped state. © 2021 The Author(s).
2020
Autores
Cardoso, V; Caldas, P; Thereza, MGR; Frazão, O; Carvalho, C; Costa, J; Santos, JL;
Publicação
EPJ Web of Conferences
Abstract
2020
Autores
Frazao, O; del Villar, I; Fabris, J; Gong, Y;
Publicação
OPTICS AND LASER TECHNOLOGY
Abstract
2020
Autores
Monteiro, CS; Raposo, M; Ribeiro, PA; Silva, SO; Frazao, O;
Publicação
PHOTONICS
Abstract
The use of graphene oxide-based coatings on optical fibers are investigated, aiming to tune the reflectivity of optical fiber surfaces for use in precision sensing devices. Graphene oxide (GO) layers are successfully deposited onto optical fiber ends, either in cleaved or hollow microspheres, by mounting combined bilayers of polyethylenimine (PEI) and GO layers using the Layer-by-Layer (LbL) technique. The reflectivity of optical fibers coated with graphene oxide layers is investigated for the telecom region allowing to both monitor layer growth kinetics and cavity characterization. Tunable reflective surfaces are successfully attained in both cleaved optical fibers and hollow microsphere fiber-based sensors by simply coating them with PEI/GO layers through the LbL film technique.
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