Tailoring light spectrum in silicon photonics chips with high-performance optical filter

Integrated photonics filters are essential components in current optical systems, spanning from telecommunications to quantum information processing or biosensing. One method for implementing optical filters in silicon photonics platforms involves periodically modulating the refractive index along the direction of propagation. This modulation directly influences the spectral characteristics of the structure, facilitating the implementation of arbitrary spectral responses through careful design of the index modulation profile. In this presentation, we summarize our recent progress in leveraging such filters to demonstrate multiband spectral responses, polarization-independent filters, high-rejection filters, and sideband-tunable notch spectral responses.