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Proceedings Paper

Harnessing femtosecond laser filaments for nano-structuring of "Lab-in-Fibre" sensors and "Spectrometer-in-Fibre" microsystems (Conference Presentation)

Paper Abstract

Beam shaping of femtosecond lasers was applied in the Kerr-lensing and aberration regime to enable high-aspect-ratio filament tracks to form uniformly through the silica cladding and core waveguide of single-mode fiber (SMF28/450). One- and two-dimensional filament arrays were embedded along the waveguide to form weak to strong photonic stopbands. The filament shape enhanced transverse light scattering into narrow azimuthal radiation zones. Tailoring of chirp and 2D patterns further facilitated high-resolution (~350 pm) spectral focusing onto a CCD camera, defining a compact “Spectrometer-in-fibre” over the visible spectrum. At higher exposure, the filaments opened into narrow nano-channels (200-400 nm diameter) presenting a novel Bragg grating for refractive index sensing of the ambient environment. This lab-in-fiber technology presents a robust, flexible, and ubiquitous communication platform for nano-scale sensing across expansive networks or into tightly confined, sinuous spaces.

Paper Details

Date Published: 10 March 2020
Proc. SPIE 11292, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XIII, 1129202 (10 March 2020); doi: 10.1117/12.2551249
Show Author Affiliations
Peter R. Herman, Univ. of Toronto (Canada)
Ehsan Alimonhammadian, Univ. of Toronto (Canada)
Keivan M. Aghdami, Univ. of Toronto (Canada)
Erden Ertorer, Univ. of Toronto (Canada)
Young Hwan Kim, Univ. of Toronto (Canada)
Jianzhao Li, Univ. of Toronto (Canada)
Abdullah Rahnama, Univ. of Toronto (Canada)

Published in SPIE Proceedings Vol. 11292:
Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XIII
Georg von Freymann; Eva Blasco; Debashis Chanda, Editor(s)

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