Highly efficient optical filter based on vertically coupled Photonic crystal cavity and bus waveguide

TL;DR

This paper presents an experimental demonstration of a highly efficient optical filter utilizing a vertically coupled photonic crystal cavity and bus waveguide on a silicon on insulator platform, enabling low-loss and high-efficiency filtering.

Contribution

The work introduces a novel vertically coupled photonic crystal cavity design that enhances coupling efficiency and reduces insertion loss in integrated optical filters.

Findings

Achieved high coupling efficiency with low insertion loss.

Demonstrated flexibility in waveguide material and dimension choices.

Validated the filter's performance experimentally.

Abstract

We experimentally demonstrate a new optical filter design based on a vertically coupled photonic crystal cavity and a bus waveguide monolithically integrated on the silicon on insulator platform. The use of a vertically coupled waveguide gives flexibility in the choice of the waveguide material and dimensions, dramatically lowering the insertion loss while achieving very high coupling efficiencies to wavelength scale resonators