Pierre-François Calmon

Oxide confinement and high contrast grating mirrors for Mid-infrared VCSELs

A new mid-infrared (MIR) Vertical Cavity Surface Emitting Laser (VCSEL) structure is proposed. We have integrated to the VCSEL structure both an oxide aperture for lateral confinement, and a sub-wavelength high-contrast-grating top mirror. Upon the GaSb-based half-VCSEL, we have grown a metamorphic AlGaAs heterostructure to enable thermal oxidation and grating mirror fabrication steps. A methodology based on optimization and anti-optimization methods has been used to design the optical grating, with improved parameter tolerances regarding processing errors. Finally, we show the complete fabrication of an electrically-pumped MIR monolithic VCSEL structure implementing both oxide confinement and a subwavelength grating top mirror.

Recent advances in electromagnetic energy harvesting and Wireless Power Transfer for IoT and SHM applications

This paper addresses the recent advances obtained in LAAS-CNRS Toulouse concerning the development of compact, high-efficiency and multiband RF/microwave energy harvesting devices for autonomous wireless sensors. Several topology of rectenna designed for the Structural Health Monitoring of the satellite antenna panels and for Internet of Things application are discussed.