Double Resonant Vertically Accessed Optical Waveguide Sensor

TL;DR

This paper introduces a novel vertically accessed optical waveguide sensor that combines two interference effects, enhancing sensitivity through a versatile design analyzed by modeling and simulations.

Contribution

The paper presents a new waveguided sensor configuration that integrates two interference effects and offers dual readout modes, optimized for improved sensitivity.

Findings

Transmission characteristics depend on fabrication parameters.

Model and FDTD simulations confirm sensor behavior.

Optimized design achieves enhanced sensitivity.

Abstract

We present a new waveguided-sensing configuration combining the advantages of two effects, namely, two-wave interference and multiple-wave interference in a single sensing device. The sensor is accessed vertically from above by means of a three-port grating, and its readout can be accomplished both in an up-reflective or waveguided mode. The superposition of the two outcoming signals results in a variety of transmission characteristic curves depending on fabrication parameters, which are optimized in order to attain enhanced sensitivity. The sensor is analyzed by means of a simple scattering matrix model and confirmed by full FDTD simulations.