Micro-Lensed Negative-Curvature Fibre Probe for Raman Spectroscopy
<p>(<b>a</b>) The cross section of the NCF (the outer diameter of the fibre is 210 µm); (<b>b</b>) NCF probe with cleaved MM fibre; (<b>c</b>) NCF probe with spherical micro-lens.</p> "> Figure 2
<p>Experimental setup where light from a 785 nm laser is coupled to the NCF fibre probe using a dichroic mirror and collected Raman-shifted wavelengths are measured with a Raman spectrometer.</p> "> Figure 3
<p>Collected Raman spectra of ethanol with the NCF probe with cleaved MM fibre and the NCF probe with the micro-lens. Note that the silica background around 500 cm<sup>−1</sup> remains constant, whereas the ethanol peaks are enhanced by the micro-lens by a factor of 1.5.</p> "> Figure 4
<p>Ethanol spectrum after background removal and smoothing for a cleaved MM probe and a micro-lens probe.</p> "> Figure 5
<p>Simulated light propagation out of fibre probes, z-propagation direction, background refractive index 1.36: (<b>a</b>) cleaved MM fibre; (<b>b</b>) micro-lensed fibre. Simulated light coupling into: (<b>c</b>) MM fibre; (<b>d</b>) micro-lensed fibre. Transverse field profile at the splice position (green line in (<b>c</b>,<b>d</b>)) for the: (<b>e</b>) cleaved MM fibre; (<b>f</b>) micro-lensed fibre.</p> "> Figure 6
<p>(<b>a</b>) Measured Raman spectra for different glucose concentrations; (<b>b</b>) 1120 cm<sup>−1</sup> peak intensity as a function of the glucose concentration in mM (blue points) and linear fit (red). Insert: closeup of concentration range 5–100 mM.</p> ">
Abstract
:1. Introduction
2. Experimental
2.1. NCF and Probe Fabrication
2.2. Experimental Setup
3. Results and Discussion
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Milenko, K.; Yerolatsitis, S.; Aksnes, A.; Hjelme, D.R.; Stone, J.M. Micro-Lensed Negative-Curvature Fibre Probe for Raman Spectroscopy. Sensors 2021, 21, 8434. https://doi.org/10.3390/s21248434
Milenko K, Yerolatsitis S, Aksnes A, Hjelme DR, Stone JM. Micro-Lensed Negative-Curvature Fibre Probe for Raman Spectroscopy. Sensors. 2021; 21(24):8434. https://doi.org/10.3390/s21248434
Chicago/Turabian StyleMilenko, Karolina, Stephanos Yerolatsitis, Astrid Aksnes, Dag Roar Hjelme, and James M. Stone. 2021. "Micro-Lensed Negative-Curvature Fibre Probe for Raman Spectroscopy" Sensors 21, no. 24: 8434. https://doi.org/10.3390/s21248434