Abstract

We report a refractive index sensor comprising a unique T-grating on top of periodic nano-cavities. The sensor has two resonant modes sensitive to different regions of the structure with low inter-region interference, hence allowing simultaneous detection of two different analytes or more accurate detection of a single analyte. The sensor also provides a self-referencing feature for a broad range of refractive indices, from 1.3 to 1.5. Using the finite difference time domain method, sensitivities of 801.7 nm ${{\rm{RIU}}^{- 1}}$ and 1386.8 nm ${{\rm{RIU}}^{- 1}}$ were recorded for the two modes. The versatility of the structure makes the sensor a prominent candidate for biochemical and other sensing applications.

© 2021 Optical Society of America

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