6533b85ffe1ef96bd12c12de
RESEARCH PRODUCT
Ultrathin high-index metasurfaces for shaping focused beams
Juan Jose MiretCarlos J. Zapata-rodríguezMahdieh HashemiMahin NaserpourCarlos Díaz-aviñósubject
WavefrontMaterials scienceSubwavelength structuresbusiness.industryMaterials Science (miscellaneous)Surface plasmonPhysics::OpticsSurface plasmonsPolarization (waves)Industrial and Manufacturing EngineeringNumerical apertureWavelengthNanolithographyOpticsBusiness and International ManagementResolutionbusinessImage resolutionRefractive indexÓpticadescription
The volume size of a converging wave, which plays a relevant role in image resolution, is governed by the wavelength of the radiation and the numerical aperture (NA) of the wavefront. We designed an ultrathin (λ/8 width) curved metasurface that is able to transform a focused field into a high-NA optical architecture, thus boosting the transverse and (mainly) on-axis resolution. The elements of the metasurface are metal-insulator subwavelength gratings exhibiting extreme anisotropy with ultrahigh index of refraction for TM polarization. Our results can be applied to nanolithography and optical microscopy. Spanish Ministry of Economy and Competitiveness (MEC) (TEC2013-50416-EXP).
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-09-01 |