Toward Arbitrary Spin‐Orbit Flat Optics Via Structured Geometric Phase Gratings (Laser Photonics Rev. 17(5)/2023)

Laser erasable implanted gratings for integrated silicon photonics.

In this work we experimentally demonstrate laser erasable germanium implanted Bragg gratings in SOI. Bragg gratings are formed in a silicon waveguide by ion implantation induced amorphization, and are subsequently erased by a contained laser thermal treatment process. An extinction ratio up to 24dB has been demonstrated in transmission for the fabricated implanted Bragg gratings with lengths up...

Applications of Geometric Phase in Optics

In the last fifteen years several manifestations of geometric phase in optics have been discovered. The most studied manifestations are spin redirection phase and Pancharatnam phase. A new phase on the transformations of optical beam modes has begun to be studied. This article reviews the principles of these phases and discusses the applications that have been proposed and reported in the liter...

Optics & Photonics News - April 2011

Chirped Gratings in Integrated Optics

Gratings with variable periods (chirped gratings) have been fabricated by recording the interference pattern of a collimated laser beam with a converging beam generated by a cylindrical lens. An analysis is presented for the behavior of the chirped gratings as a function of wavelength, the angle between the illuminating beams, the F number of the lens, and its position. To calculate the power r...

Tunable graphene based optics, electronics and photonics

Graphene, which consists of a single atom-thick plane of carbon atoms arranged in a honeycomb lattice, exhibits unique both " bulk " and " surface " properties of materials due to its tunable electronic structure. In this talk, I would like to present the tunable platform of graphene-based materials including graphene and graphene oxide in optical, electronic and photonic applications by manipu...