One-Scan Study of the Size-Dependent Light Localization by Pure Dye Nano-Doughnuts and Nano-Rings

International audienc

Confined surface waves in layered dielectric materials

We demonstrate deep subwavelength confinement of surface phonon-polaritons in silicon carbide by capping the crystal with nanometric layers of MoS2. Near-field nano-imaging shows 85 time surface wave confinement in comparison with free-space wavelength of 11.15 micrometers

Near-Field Optical Modification of individual nano-objects

International audienc

Plasmonics of topological insulators

We discuss the plasmonic properties of chalcogenide topological insulators arising from interband transitions and Drude-like response of metallic surface states in the UV to mid-IR, which provide a new platform for electronics and photonics integration

Nanoimaging of topologically protected waveguide mode at telecommunication frequency

We demonstrate near-field mapping of a valley-Hall photonic waveguide at telecommunication frequency. Launching and guiding of an optical mode along the boundary between opposite valley-Chern-index domains is experimentally observed in real space, in agreement with theoretical calculations

Near-field detection of plasmonic modes in topological insulator nanostructures in the visible part of the spectrum

In this work we perform direct nano-imaging of nanostructured Bi1.5Sb0.5Te1.8Se1.2 (BSTS) topological insulator in the visible range and show the evidence of dipolar and higher order local surface plasmon modes. Revealed plasmon modes in BSTS nanostructures present the TI as a good plasmonic material beyond noble metals

Near-field mapping of the edge mode of a topological valley slab waveguide at λ = 1.55 μm

Valley polarized topological states of light allow for robust waveguiding which has been demonstrated for transverse-electric modes in THz and near-infrared parts of the spectrum. As the topological protection relies on guiding the light via a highly structured surface, direct imaging of the photonic modes at sub-unit cell resolution is of high interest but challenging in particular for transverse-magnetic modes. Here, we report mapping the transverse-magnetic modes in a valley photonic crystal waveguide using scattering-type scanning near-field optical microscopy at the optical telecom C-band wavelength. The waveguide based on a triangular air-hole motif with broken inversion symmetry is fabricated from suspended Germanium layer. We observed the launching and guiding of the transverse-magnetic edge mode along the boundary between topologically distinct domains with opposite valley Chern indices. These results are supported by theoretical simulations, and provide insight into the design and use of topological protected states for applications in densely integrated optical telecommunication devices

Dataset for Visible Range Plasmonic Modes on Topological Insulator Nanostructures

Dataset supporting: Dubrovkin, Alexander et al (2016) Visible range plasmonic modes on topological insulator nanostructures. Advanced Optical Materials.</span