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Title: Femtosecond laser micromachining of compound parabolic concentrator fiber tipped glucose sensors
Authors: Hassan, Hafeez Ul 
Lacraz, Amédéé 
Kalli, Kyriacos 
Bang, Ole 
Keywords: Fiber optics sensors;Polymers;Blood or tissue constituent monitoring;Nonimaging optics
Category: Electrical Engineering - Electronic Engineering - Information Engineering
Field: Engineering and Technology
Issue Date: 1-Mar-2017
Publisher: SPIE
Source: Journal of Biomedical Optics, 2017, Volume 22, Issue 3, Article number 037003
metadata.dc.doi: 10.1117/1.JBO.22.3.037003
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.
ISSN: 10833668
Rights: © The Authors
Type: Article
Appears in Collections:Άρθρα/Articles

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