Zero-crosstalk silicon photonic refractive index sensor with subwavelength gratings.

ABSTRACT: Silicon photonic index sensors have received significant attention for label-free bio and gas-sensing applications, offering cost-effective and scalable solutions. Here, we introduce an ultra-compact silicon photonic refractive index sensor that leverages zero-crosstalk singularity responses enabled by subwavelength gratings. The subwavelength gratings are precisely engineered to achieve an anisotropic perturbation-led zero-crosstalk, resulting in a single transmission dip singularity in the spectrum that is independent of device length. The sensor is optimized for the transverse magnetic mode operation, where the subwavelength gratings are arranged perpendicular to the propagation direction to support a leaky-like mode and maximize the evanescent field interaction with the analyte space.

SUBMITTER: Ahmed SZ 

PROVIDER: S-EPMC11438762 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature