Tapered GRIN fiber microsensor

Autor(es)

Beltran-Mejia, Felipe ^[1] ; Biazoli, Claudecir R. ^[1] ; Cordeiro, Cristiano M. B. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Optics Express; v. 22, n. 25, p. 30432-30441, DEC 15 2014.
• Citações Web of Science: 3

Resumo

The sensitivity of an optical fiber microsensor based on inter-modal interference can be considerably improved by tapering a short extension of the multimode fiber. In the case of Graded Index fibers with a parabolic refractive index profile, a meridional ray exhibits a sinusoidal path. When these fibers are tapered, the period of the propagated beam decrease down-taper and increase up-taper. We take advantage of this modulation -along with the enhanced overlap between the evanescent field and the external medium- to substantially increase the sensitivity of these devices by tuning the sensor's maximum sensitivity wavelength. Moreover, the extension of this device is reduced by one order of magnitude, making it more propitious for reduced space applications. Numerical and experimental results demonstrate the success and feasibility of this approach. (C) 2014 Optical Society of America (AU)

• Processo FAPESP: 11/01524-8 - Modelagem e Otimização de Fibras Ópticas Micro-estruturadas e Micro/nanofibras.
• Beneficiário: Felipe Beltrán Mejía
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado