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A miniature refractive index sensor formed by a high quality (Q-) photonic crystal (PhC) cavity based fiber loop ring-down (FLRD) was demonstrated. To the best of our knowledge, this technology has not been reported. The ring-down time would be changed with the transmittance of PhC cavity, which is related to the refractive index of the infiltrated liquids. By using the finite-difference time-domain...
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