Numerical investigation of specialty optical fibers for application in broadband ultrasonic sensors and transmitters

• Grant number: 22/10584-9
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Effective date (Start): January 01, 2023
• Effective date (End): June 30, 2025
• Field of knowledge: Engineering - Electrical Engineering - Telecommunications
• Principal Investigator: Cristiano Monteiro de Barros Cordeiro
• Grantee: Ricardo Ezequiel da Silva
• Host Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

This project aims the numerical investigation of acoustic and optical properties of specialty optical fibers with potential for the development of high frequency acousto-optic modulators and broadband fiber-optic ultrasonic sensors and transmitters up to 100 MHz. Such devices have remarkable applications in telecommunications, industry, biomedicine, and Defense. This research intends therefore to exploit the distinct benefits of microscrutured fibers to overcome the frequency, efficiency and sensitivity limitations, faced by real devices based on standard optical fibers under current experimental investigation. The fabrication and operation of these devices are restricted by frequency-induced high attenuation, distortion, and resonances of acoustic signals. This study plans to minimize considerably these issues by means of specific suspended core fibers and hollow core fibers, which are mostly composed by air-holes in the fiber cross section. These features are promising to confine and amplify high frequency ultrasound inside the fibers, drastically increasing the interaction of acoustic and optical modes in the fiber core. The methodology includes design, simulation, and analysis of the fibers' geometry by employing 2D and 3D modeling techniques based on the finite element method. The final objective is to propose new fiber designs and devices to improve the frequency and temporal responses of ultrasonic signals towards high and flat efficiency over a broad frequency range. In addition, useful information required for further fabrication of these devices are expected. In summary, the results will promote considerable reduction of size, material, consumed energy and overall costs, enabling ultracompact and faster all-fiber acousto-optic devices to modulate fiber lasers, as well, high-resolution photoacoustic sensors and transmitters for state-of-the-art ultrasonic microscopy and neurostimulation. (AU)

Publicações científicas

(Referências obtidas automaticamente do Web of Science e do SciELO, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores)

DA SIVA, RICARDO E.; FRANCO, MARCOS A. R.; IEEE. Spectral Modulation of Antiresonant Hollow Core Optical Fiber with Flexural Acoustic Waves. 2023 INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS, OMN AND SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, SBFOTON IOPC, v. N/A, p. 2-pg., 2023-01-01. (22/10584-9)