Metamatériaux 'tout diélectrique' pour une photonique à indice zéro // all-dielectric metamaterials for zero-index-photonic: negative index and near-zero index materials at terahertz

Topic description

Dans les matériaux à indice nul, la phase est quasiment constante. Cela entraine un découplage des champs électrique et magnétique ; et donc, de la longueur d'onde et de la fréquence. La photonique à indice nul a donc des aspects fondamentaux et des implications
pratiques. Les systèmes visés sont les composants optiques et les systèmes antennaires.
Les métamatériaux ont ouvert de nouveaux champs en physique et en ingénierie, car ces matériaux artificiels structurés présentent des propriétés électromagnétiques inhabituelles, notamment l'indice de réfraction négatif ou nul, la focalisation sub-longueur d'onde, etc.
Nous considérons des métamatériaux 'tout diélectrique' qui ne subissent pas de pertes ohmiques ; cela permet d'atteindre le domaine du terahertz avec moins de dissipation d'énergie. De plus, leur cellule élémentaire a une géométrie simple.
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The main feature of Zero Index Materials is that the phase distribution of the EM field is nearly constant, because of the decoupling of the electric and the magnetic fields, that results in the ``decoupling of the `` spatial'' (wavelength) and the ``temporal'' (frequency)''.
Zero Index Photonics has consequently fundamental and technological implications on different subfields of optics and nanophotonics. Antennas systems and optical components operating in the terahertz range are the targeted devices.
Metamaterials have opened a new field in physics and engineering. Indeed, these artificial structured materials give rise to unnatural fascinating phenomena such as negative index, sub-wavelength focusing and cloaking. Metamaterials also exhibit near-zero refractive index. These open a broad range of applications, from the microwave to the optical frequency domain. Metamaterials have now evolved towards the implementation of optical components.
Metamaterials that exhibit Near-Zero Index metamaterials (NZI) have a large number of applications including wavefront engineering, directivity and gain enhancement of antennas, electromagnetic cloaking, phase matching for nonlinear applications, unidirectional
transmission, defect waveguides, Zero-index Materials (ZIM) cavities,.. .
We consider All-Dielectric Metamaterials (ADM) which are the promising alternative to metallic metamaterials, because they undergo no
ohmic losses and consequently benefit of low energy dissipation and because they are of simple geometry. This makes them perfectly suited to the terahertz domain
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Début de la thèse : 01/10/

Funding category

Funding further details

Programme pour normalien ENS Paris-Saclay