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Abstract

Optics Express 2017, 25, 7046-7054

Photonic crystal microring resonator for labelfree biosensing

Lo SM, Hu SR, Gaur G, Kostoulas Y, Weiss SM, Fauchet PM

A label-free optical biosensor based on a one-dimensional photonic crystal microring resonator with enhanced light-matter interaction is demonstrated. More than a 2-fold improvement in volumetric and surface sensing sensitivity is achieved compared to conventional microring sensors. The experimental bulk detection sensitivity is similar to 248nm/RIU and label-free detection of DNA and proteins is reported at the nanomolar scale. With a minimum feature size greater than 100nm, the photonic crystal microring resonator biosensor can be fabricated with the same standard lithographic techniques used to mass fabricate conventional microring resonators.