DQMP Informal Seminar - Identification and manipulation of low loss polaritons in low dimensional systems

22.08.2019 10:00 – 11:00

Identification and manipulation of low loss polaritons in low dimensional systems

Nanophotonics, manipulating light on nanoscale or studying interaction between light and nanoscale objects, show great potential in quantum physics, photo-catalytic chemistry and bio-sensing. A practical approach toward nanophotonics is offered by polaritons, coupling between photons and coherent oscillating charges, such as plasmon, phonon, exciton etc. Until now, scattering-type scanning near-field microscope (s-SNOM) is the only technique to visualize and probe polaritons in van der Waals materials. In this talk, I will demonstrate our work on searching novel plasmonic medium, engineering phonon polaritons, and developing powerful technique for polaritonics. Firstly, I will show the nano-infrared images of surface plasmon in Indium Arsenide nanowires with high quality factor, nanoscale confining capability and tunability. Secondly, we propose the idea to realize in-plane engineering of phonon polaritons in hexagonal boron nitride crystal by controlling local dielectric environment with phase change materials. Finally, I will introduce you our home-made advanced s-SNOM simultaneously with spatial (~20 nm), temporal (~100 fs), and chemical resolution (~6 cm-1).

Lieu

Bâtiment: Ecole de Physique

Salle MaNEP

entrée libre