Geometric resonances for high-sensitivity microfluidic lasing sensors
Date
2018
Authors
Morrish, W.
Riesen, N.
Stobie, S.
Francois, A.
Meldrum, A.
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Physical Review Applied, 2018; 10(5):1-6
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Abstract
Microcapillaries are inherently fluidic 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 reflection 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 significantly 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 differential 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 microfluidic sensing.
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Copyright 2018 American Physical Society