Femtosecond laser-induced microstructures on diamond for microfluidic sensing devices applications

Su, Shi, Li, Jiangling, Lee, Graham, Sugden, Kate, Webb, David and Ye, Haitao (2013). Femtosecond laser-induced microstructures on diamond for microfluidic sensing devices applications. Applied physics letters, 102 (23),

Abstract

This paper reported a three-dimensional microfluidic channel structure, which was fabricated by Yb:YAG 1026?nm femtosecond laser irradiation on a single-crystalline diamond substrate. The femtosecond laser irradiation energy level was optimized at 100?kHz repetition rate with a sub-500 femtosecond pulse duration. The morphology and topography of the microfluidic channel were characterized by a scanning electron microscope and an atomic force microscope. Raman spectroscopy indicated that the irradiated area was covered by graphitic materials. By comparing the cross-sectional profiles before/after removing the graphitic materials, it could be deduced that the microfluidic channel has an average depth of ~410?nm with periodical ripples perpendicular to the irradiation direction. This work proves the feasibility of using ultra-fast laser inscription technology to fabricate microfluidic channels on biocompatible diamond substrates, which offers a great potential for biomedical sensing applications.

Uncontrolled Keywords: atomic force microscopy, surface topography, surface morphology, scanning electron microscopy, Raman spectra, microfluidics, microfabrication, laser beam effects, high-speed optical techniques, crystal microstructure, diamond
Published Date: 2013-07-01
Authors: Su, Shi
Li, Jiangling
Lee, Graham
Sugden, Kate
Webb, David
Ye, Haitao

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