Whispering gallery mode microtoroid optical resonators are one of the most sensitive and rapid sensors in existence. However, the need for a tapered optical fiber to couple light into these sensors hinders translation out of laboratory as the fiber is fragile and suffers from mechanical vibration. Here, we developed a free space coupling system together with a compatible fluidic platform which allows monitoring of molecular interactions in real time. We obtained Q-factors as high as 1.6×10^8 with this approach. The large effective coupling area, ~10 μm in diameter for a numerical aperture of 0.14, provides high coupling stability during biosensing experiments.
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Suebka et al. (2024) studied this question.
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