All‐Glass Metasurfaces for Ultra‐Broadband and Large Acceptance Angle Antireflectivity: from Ultraviolet to Mid‐Infrared (Advanced Optical Materials 12/2023)

Optical characterization of porous alumina from vacuum ultraviolet to midinfrared

Porous alumina was fabricated and optically characterized over a wide spectral range. Layers were formed electrochemically in oxalic acid solution from 10-mm-thick aluminum films evaporated onto silicon wafers. The layer formation was monitored with in situ spectroscopic ellipsometry in the visible and near-infrared wavelength range to accurately determine the thickness and dielectric functions...

Optical metasurfaces: from planar to conformable optics

Abrupt modifications of the fields across an interface can be engineered by depositing an array of subwavelength resonators specifically tailored to address local amplitude, phase and polarization changes [1]. Physically, ultrathin nanostructure arrays, called “metasurfaces”, control light by engineering artificial boundary conditions of Maxwell’s equations. Metasurfaces have been implemented t...

Tunable Materials and Metasurfaces – from Quantum to Perfect

Active Optical Metasurfaces Based on Defect-Engineered Phase-Transition Materials.

Active, widely tunable optical materials have enabled rapid advances in photonics and optoelectronics, especially in the emerging field of meta-devices. Here, we demonstrate that spatially selective defect engineering on the nanometer scale can transform phase-transition materials into optical metasurfaces. Using ion irradiation through nanometer-scale masks, we selectively defect-engineered th...

Advanced Optical Microscopies for Materials: New trends

This article summarizes the new trends of Optical Microscopy applied to Materials, with examples of applications that illustrate the capabilities of the technique. Handbook of instrumental techniques from CCiTUB Advanced Optical Microscopies for Materials 1 MT.6