Integrated photonics
The development of integrated photonic circuits on a chip makes it possible to replace electronic information processing with photonic processing. These circuits offer new capabilities for classical and quantum communications, on-chip sensors, and the creation of light sources across a wide range of wavelengths. In this context, the team is developing circuits that integrate photonic sources and functionalities (filters, frequency combs, modulators, etc.), relying primarily on III-nitride materials. Fully electrical control of these devices is a medium-term goal, as is the extension to the quantum regime, for example by generating single photons or entangled photon pairs.
GaN-based photonic platform
By developing a GaN-based photonic platform, team members demonstrated resonators with an optical quality factor of 230,000 at a wavelength in
the telecommunications range. Second-harmonic generation with a continuous-wave conversion efficiency of 0.24%/W was also demonstrated.
Caption:
⋄(a) Optical microscope images of nanoresonators. The inset shows a scanning electron microscope (SEM) image of a mirror.⋄(b) SEM image showing the gap between the waveguide and the ring resonator.
⋄(c) Image of GaN walls after reactive ion etching (ICP).
⋄(d) Image showing an overview of a structure with a close-up of the cleaved facet. – Adapted from M. Gromovyi et al., Optics Express 30(12), 20737 (2022)
Contact ?
