Abstract
Detection of fluorescence from a low quantum yield fluorophore is challenging for a fiber-optic probe, especially when an inexpensive and robust construction is desired. We propose a conceptually straightforward theoretical model to optimize the factors affecting the fluorescence-capture capability of a bifurcated/coaxial fiber-optic probe. Experimentally we verify that such a probe, if optimized, can detect the fluorescence of a polymer fluorophore with a low quantum yield of 0.0065.
Highlights
A fiber-optic probe wins over other means for chemical species analysis due to its wellknown advantages: it is lightweight, flexible, non-toxic, low-loss, cost-effective and has a remote-monitoring capability
We investigate the use of the flat-tipped coaxial fiber-optic probe to detect the fluorescent signal of the low quantum-yield fluorophore under the simplest procedures and at the lowest possible cost
The analytical expression obtained shows how the captured fluorescent power is affected by such important parameters as the molar absorptivity, the sample concentration, the quantum yield, the excitation power intensity, the dimensions of the fiber core and cladding, and the value of Numerical aperture (NA)
Summary
A fiber-optic probe wins over other means for chemical species analysis due to its wellknown advantages: it is lightweight, flexible, non-toxic, low-loss, cost-effective and has a remote-monitoring capability. In comparison to the flat-tipped probe, the bevel-tipped end is hard to fabricate and offers poor protection of the sensing area Given these issues, we investigate the use of the flat-tipped coaxial fiber-optic probe to detect the fluorescent signal of the low quantum-yield fluorophore under the simplest procedures and at the lowest possible cost. For a coaxial fiber-optic probe, there are six identical overlapping volumes that contribute to the overall captured fluorescent power For the reasons outlined above, this must be considered the optimal design taking into account all the factors discussed so far
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