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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - An optofluidic microcapillary biosensor for label-free, low glucose concentration detection
摘要： A microcapillary with a Q factor of 1.3×106 and a 2-μm wall thickness is used to detect glucose functionalized concentration of 2.78 mM, with sensitivity of 0.974 pm/mM and small sample volume ~ 90 nL.
关键词： Glucose,Optofludic microcapillary,Whispery gallery mode
更新于2025-09-16 10:30:52
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Geometric Resonances for High-Sensitivity Microfluidic Lasing Sensors
摘要： Microcapillaries are inherently ?uidic sensing platforms that can, under appropriate conditions, support lasing. We propose and demonstrate a lasing microcapillary sensor based on “star” and “triangle” interferences arising from re?ection and refraction at the inner and outer microcapillary walls. These interferences lead to distinct modal trajectories that sample the channel medium inside the microcavity structure. Both star and triangle resonances are therefore sensitive to the nature of the channel medium, yielding theoretical and experimental sensitivities signi?cantly exceeding those found for sensors based on conventional whispering-gallery modes. Additional enhancement can be achieved because the two main resonance families shift in an opposite sense, yielding a di?erential sensitivity that can reach several thousand nanometers per refractive index “unit.” These devices represent a robust, yet easily fabricated optical sensor and capillary-based lasing system for micro?uidic sensing.
关键词： micro?uidic sensing,refractive index sensitivity,lasing sensor,geometric resonances,microcapillary
更新于2025-09-10 09:29:36
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Raman thermometry in water, ethanol and ethanol/nitrogen-mixtures from ambient to critical conditions
摘要： We present investigations into remote liquid temperature sensing with Raman spectroscopy using different evaluation methods for the OH stretching vibration band. Water, ethanol and ethanol saturated with nitrogen, all as liquids or liquid-like supercritical fluids, are pumped through a heated microcapillary system at elevated pressures. Raman spectra are recorded from the liquid inside the microcapillary and are evaluated with respect to the temperature sensitivity of the OH stretching vibration. The four approaches applied are (i) to evaluate the center position of the Raman OH-band, (ii) the integrated absolute difference spectrum, (iii) the intensity ratio of two regions of the OH-band, and (iv) the intensity ratio of two fitted Gaussian peaks. The temperature range investigated covers from ambient temperature to the component’s respective boiling temperature or critical temperature at sub- and supercritical pressures. Precision and robustness of the employed methods are characterized. It is shown that two out of the four methods feature temperature deviations smaller than 5 K at all pressures, and that one method can also be applied to liquid mixtures of ethanol and nitrogen. Applicability to other liquids and mixtures is discussed.
关键词： temperature sensing,supercritical fluids,OH stretching vibration,water,Raman spectroscopy,nitrogen,microcapillary,ethanol
更新于2025-09-04 15:30:14