Grated Waveguide Optical Cavity for Sensing

Cantilever deflection read-out with a grated waveguide optical cavity

We propose a novel and highly sensitive mechanooptical device for gas-sensing through nano-displacements, based on micro-cantilevers, supplied with a selective gas absorbing layer (Pd), suspended above a Si3N4 grated waveguide (GWG). We present the simulation and preliminary experimental results, which indicate the sensing of nanodisplacements, an important intermediate step for the gas-sensing...

Grated Waveguide Optical Cavity as a Compact Sensor for Sub-nanometre Cantilever Deflections

We propose a novel and highly sensitive integrated read-out scheme, capable of detecting sub-nanometre deflections of a cantilever in close proximity to a grated waveguide structure. We discuss modelling results for an SiO2 cantilever to be integrated with an optical cavity defined by a grated Si3N4 waveguide.

Numerical investigation and optimization of a mechano - optical sensor based on a grated waveguide optical cavity

Compact Integrated Optical Sensors using Slow-Light Propagation in Grated Waveguide based Cavities

We demonstrate the versatility of a silicon nitride grated waveguide optical cavity as compact integrated optical sensors for (bulk) concentration detection, label-free protein sensing, and – with an integrated microbridge suspended above it – gas sensing. A grated waveguide (GWG), which is a waveguide with a finite-length grated section, acts as an optical resonator, showing sharp fringes in t...

Si3N4 Grated Waveguide Optical Cavity based Sensors for Bulk-index Concentration, Label-free Protein, and Mechano-Optical Gas Sensing

A grated waveguide (GWG), which is a waveguide with a finite-length grated section, acts as an optical resonator, showing sharp fringes in the transmission spectrum near the stop-band edges of the grating. These oscillations are due to Fabry-Perot resonances of Bloch modes propagating in the cavity defined by the grated section [1]. Small changes in the environment of the GWG, which disturb the...