1999
DOI: 10.1088/0022-3727/32/24/311
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Physical characterization of lightguide capillary cells

Abstract: There are different types of optical capillary cells in use for the modern on-line UV-VIS analysis of liquids using fibre spectrometers. These cells have the advantages of low sample volume, long optical pathlengths and compatibility to fibre optics. In this paper, we will show that the liquid core waveguide (LCW) is a particularly useful device because the light intensity is confined in the liquid core. This is shown in two ways. Firstly, the measured total optical losses of the LCW capillary device indicate … Show more

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Cited by 21 publications
(11 citation statements)
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“…This deviation from the Beer-Lambert law has been observed in other LCW systems but has not been suYciently explained [12][13][14]. Given the property of total internal reXection of the LCW, any Xuorescence from the sample (I f ) would be eVectively guided to and detected by the photodiode.…”
Section: Limitations Of Uv Absorption Spectroscopy In Cowsmentioning
confidence: 86%
“…This deviation from the Beer-Lambert law has been observed in other LCW systems but has not been suYciently explained [12][13][14]. Given the property of total internal reXection of the LCW, any Xuorescence from the sample (I f ) would be eVectively guided to and detected by the photodiode.…”
Section: Limitations Of Uv Absorption Spectroscopy In Cowsmentioning
confidence: 86%
“…As discussed above, this task is not trivial, but there is a class of fluorinated polymers, such as Teflon AF that have been successfully used to build LCWs. Teflon AF has an index of 1.29 and has been incorporated as a cladding layer both in cylindrical tubes and on materials that were wafer-bonded to form a rectangular shaped hollow cross section (Schelle et al 1999;Datta et al 2003). The latter is illustrated in Fig.…”
Section: Liquid-core Waveguidesmentioning
confidence: 99%
“…Here, the main challenge lies in creating efficient optical confinement in a low-index nonsolid core and developing an interface to deliver light and liquid to the interaction region. A number of liquid-core waveguide types including leaky waveguides [88], porous cladding waveguides [89], slot waveguides [90], liquid-liquid [91], and liquid-air waveguides [92], hollow-core photonic crystal fibers (HC-PCF) [93], and liquid-core antiresonant reflecting optical waveguides (LC-ARROWs) [9496] have been developed for this purpose.…”
Section: Optofluidic Particle Manipulationmentioning
confidence: 99%