LECESTRE , Aurélie

Diffraction drastically limits the bit density in optical data storage. To increase the storage density, alternative strategies involving supplementary recording dimensions and robust readout schemes must be explored. Here, we propose to encode multiple bits of information in the geometry of subwavelength dielectric nanostructures. A crucial...

Vertical gate-all-around (V-GAA) represents the ultimate configuration in the forthcoming transistor industry, but it still encounters challenges in the semiconductor community. This paper introduces, for thefirst time, a dual-input logic gate circuit achieved using 3D vertical transistorswith nanoscale sub-20-nm GAA, employing a novel...

The tailoring of optical properties of photonic nanostructures is usually based on a reference design. The target optical behavior is obtained by variations of an initial geometry. This approach however can be of limited versatility, in particular if complex optical properties are desired. In order to design double-resonant photonic...

The rational design of photonic nanostructures consists of anticipating their optical response from systematic variations of simple models. This strategy, however, has limited success when multiple objectives are simultaneously targeted, because it requires demanding computational schemes. To this end, evolutionary algorithms can drive the...

We study second harmonic generation (SHG) from individual silicon nanowires. We show that second harmonic intensity is strongly dependent on the Mie resonances supported by the nanowire. The second harmonic polarization also has a size-dependent behavior, which is linked to different surface and bulk-like nonlinear susceptibility contributions....

International audience

International audience

Through simulation design, fabrication and characterization of optical sili- con metasurfaces, we discuss the influence of different nanofabrication errors and propose strategies to optimize the robustness of the fabrication of complex metasurfaces.

Abstract Optical metasurfaces have raised immense expectations as cheaper and lighter alternatives to bulk optical components. In recent years, novel components combining multiple optical functions have been proposed pushing further the level of requirement on the manufacturing precision of these objects. In this work, we study in details the...

The development of an efficient photocatalyst capable of producing enough hydrogen for applications in everyday life under direct sunlight exposure is still challenging. In this work, a new concept for a three-dimensional microstructured photocatalyst is proposed, in which a standard deep-reactive ion etching process allows for the...

We propose a simple experimental technique to separately map the emission from electric and magnetic dipole transitions close to single dielectric nanostructures, using a few-nanometer thin film of rare-earth-ion-doped clusters. Rare-earth ions provide electric and magnetic dipole transitions of similar magnitude. By recording the...

The technology of GaN HEMT structures is the subject of major developments for large-gap power components. However, it is necessary to develop innovative technological solutions to obtain high-performance normally-off devices. We present a new normally-off structure based on a nanostructured P-GaN multi-well gate. The design of this structure,...

We propose a simple experimental technique to separately map the emission from electric and magnetic dipole transitions close to single dielectric nanostructures, using a few-nanometer thin film of rare-earth-ion-doped clusters. Rare-earth ions provide electric and magnetic dipole transitions of similar magnitude. By recording the...

It has been experimentally demonstrated only recently that a simultaneous excitation of interfering electric and magnetic resonances can lead to uni-directional scattering of visible light in zerodimensional dielectric nanoparticles. We show both theoretically and experimentally, that stronglyanisotropic scattering also occurs in individual...

High refractive index dielectric nanostructures provide original optical properties thanks to the occurrence of size- and shape-dependent optical resonance modes. These modes commonly present a spectral overlap of broad, low-order modes (\textit{e.g}. dipolar modes) and much narrower, higher-order modes. The latter are usually characterized by...

International audience