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Journal of Biomedical Optics • Open Access

Femtosecond laser micromachining of compound parabolic concentrator fiber tipped glucose sensors

Paper Abstract

We report on highly accurate femtosecond (fs) laser micromachining of a compound parabolic concentrator (CPC) fiber tip on a polymer optical fiber (POF). The accuracy is reflected in an unprecedented correspondence between the numerically predicted and experimentally found improvement in fluorescence pickup efficiency of a Förster resonance energy transfer-based POF glucose sensor. A Zemax model of the CPC-tipped sensor predicts an optimal improvement of a factor of 3.96 compared to the sensor with a plane-cut fiber tip. The fs laser micromachined CPC tip showed an increase of a factor of 3.5, which is only 11.6% from the predicted value. Earlier state-of-the-art fabrication of the CPC-shaped tip by fiber tapering was of so poor quality that the actual improvement was 43% lower than the predicted improvement of the ideal CPC shape.

Paper Details

Date Published: 14 March 2017
PDF: 5 pages
J. Biomed. Opt. 22(3) 037003 doi: 10.1117/1.JBO.22.3.037003
Published in: Journal of Biomedical Optics Volume 22, Issue 3
Show Author Affiliations
Hafeez Ul Hassan, DTU Fotonik (Denmark)
Amédée Lacraz, Cyprus Univ. of Technology (Cyprus)
Kyriacos Kalli, Cyprus Univ. of Technology (Cyprus)
Ole Bang, DTU Fotonik (Denmark)

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