Highly Amplified Broadband Ultrasound in Antiresonant Hollow Core Fibers

Autor(es)

da Silva, Ricardo E. ; Webb, David John ; Cordeiro, Cristiano Monteiro de Barros ; Franco, Marcos Antonio Ruggieri

• Tipo de documento: Artigo Científico
• Fonte: ADVANCED PHOTONICS RESEARCH; v. N/A, p. 8-pg., 2024-10-20.

Resumo

High-frequency broadband ultrasound in nested antiresonant hollow core fibers (NANFs) is investigated for the first time. NANFs have remarkable features enabling high-resolution microscale optoacoustic imaging sensors and neurostimulators. Solid optical fibers have been successfully employed to measure and generate ultrasonic signals, however, they face issues concerning attenuation, limited frequency range, bandwidth, and spatial resolution. Herein, highly efficient ultrasonic propagation in NANFs from 10 to 100 MHz is numerically demonstrated. The induced pressures and sensing responsivity are evaluated in detail, and important parameters for the development of ultrasonic devices are reviewed. High pressures (up to 234 MPa) and sensing responsivities (up to -207 dB) are tuned over 90 MHz range by changing the diameters of two distinct NANF geometries. To the best of knowledge, this is the widest bandwidth reported using similar diameter fibers. The results are a significant advance for fiber-based ultrasonic sensors and transmitters, contributing to improve their efficiency and microscale spatial resolution for the detection, diagnosis, and treatment of diseases in biomedical applications. Highly efficient ultrasound propagation in antiresonant hollow core fibers is demonstrated from 10 to 100 MHz. Significant pressures (up to 234 MPa) and sensing responsivities (up to -207 dB) are tuned over a 90 MHz broadband range by adjusting the fiber geometry. These achievements are promising for optoacoustic sensors and neurostimulators, improving spatial resolution to treat diseases in biomedical applications.image (c) 2024 WILEY-VCH GmbH (AU)

• Processo FAPESP: 24/02995-4 - Fibras Ópticas Microestruturadas Poliméricas
• Beneficiário: Cristiano Monteiro de Barros Cordeiro
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 22/10584-9 - Investigação numérica de fibras ópticas especiais para aplicação em sensores e transmissores ultrassônicos banda larga
• Beneficiário: Ricardo Ezequiel da Silva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado