Abstract

We investigate an air-slot photonic crystal cavity for high-precision refractive index sensing. The high quality factor 2.6×104 of the cavity, along with a strong overlap between the resonant mode and the hollow core region, allows us to achieve an experimental sensitivity of 510nm per refractive index unit (RUI) and a detection limit below 1×105RUI. The device has a remarkably low sensing volume of 40 aliters, holding less than 1×106 molecules.

© 2010 Optical Society of America

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