Compact and Highly Sensitive Refractive Index Sensor Based on Embedded Double-Ring Resonator Using Vernier Effect

A compact and highly sensitive liquid refractive index (RI) sensor using Vernier effect achieved with embedded double-ring resonator is proposed demonstrated. Unlike these conventional sensors cascaded resonators to achieve effect, in our (EDRS) the sensing ring on reference ring, which makes more while achieving high sensitivity. Our typical fabricated EDRS polymer material, has a footprint of 1500 μm × 850 μm, achieves RI sensitivity as 7390 nm/RIU aqueous medium, excellent agreement theoretical one.