T Grating on Nano-Cavity Array based Refractive Index Sensor

Abstract

We report a refractive index sensor comprising of 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 allows 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 index, from 1.3 to 1.5. Using the FDTD method, the sensitivities of 801.7 nm/RIU and 1386.8 nm/RIU have been recorded for the two modes respectively. The versatility of the structure makes the sensor a prominent candidate for biochemical and other sensing applications.

arXiv comment8 pages, 7 figures

References in corpus (8)

• The PVLAS experiment: measuring vacuum magnetic birefringence and dichroism with a birefringent Fabry-Perot cavity
• Universal method for realization of strong light-matter coupling in hierarchical microcavity-plasmon-exciton systems
• Polygonal vortex beams in quasi-frequency-degenerate states
• Theory of self-induced back-action optical trapping in nanophotonic systems
• A tunable plasmonic refractive index sensor with nanoring-strip graphene arrays
• Surface plasmon polaritons on soft-boundary graphene nanoribbons and their application as voltage controlled plasmonic switches and frequency demultiplexers
• Integrated collinear refractive index sensor with Ge PIN photodiodes
• Ultra-narrow spectral response of a hybrid plasmonic-grating sensor