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CHIRALITY ROOT. "Almost all materials encountered in optics, such as glass or water, have positive values for both permittivity ε and permeability µ. However, metals such as silver and gold have negative permittivity at shorter wavelengths." https://lnkd.in/eMWCxE4 View in LinkedIn

NEGATIVE REFRACTIVE INDEX (NI). "So what are these fantastic artificial materials capable of achieving such a ‘rare’ state of nature? Veselago pointed out that a medium having an NI of refraction would essentially add a new twist to virtually every EM phenomenon." https://lnkd.in/ePVzVDS View in LinkedIn

NEGATIVE REFRACTIVE INDEX. "But nature has hidden a great secret from us, first described by Russian physicist Victor Veselago. Veselago realized that if a material were found that had negative values for both the electric and magnetic response functions...then its index of refraction would also be negative." https://lnkd.in/ePVzVDS View in LinkedIn

DO NIMs OCCUR IN NATURE? A brilliant and detailed survey of photonic structures and their properties in nature. So far, it is generally held that negative refractive index materials (NIM) do not occur in nature. https://lnkd.in/eZXAEpJ View in LinkedIn

NEGATIVE REFRACTIVE INDEX. "In virtually all undergraduate and graduate level texts on the subject of optics or electricity and magnetism, the refractive index is always assumed positive." https://lnkd.in/ePVzVDS View in LinkedIn

THE CUTTING EDGE. "A new four-fold symmetry double-layer chiral structure is designed, of which the operating wavelength band is in the optical region." https://lnkd.in/e63vepq View in LinkedIn

VOIDS IN THE SPECTRUM. "These artificially structured composites, known as metamaterials, have the potential to fill critical voids in the electromagnetic spectrum where material response is limited and enable the construction of novel devices." https://lnkd.in/ePVzVDS View in LinkedIn

TECHNICAL ADVANCE. "Our approach is a significant advance for scalable nanofabrication of optical 3D photonic crystals and metamaterials that will find applications in the coating of large arbitrarily-curved surfaces to provide optical filters and switches, sensors, cloaking, light harvesting, and enhanced photochemical devices." https://lnkd.in/erZViDf View in LinkedIn

VOIDS IN THE SPECTRUM. "Engineered materials composed of designed inclusions can exhibit exotic and unique electromagnetic properties not inherent in the individual constituent components." https://lnkd.in/ePVzVDS View in LinkedIn

3D PHOTONIC CRYSTALS. "Controlling electromagnetic (EM) waves in three dimensions using photonic crystals has stimulated research over several decades. In such structures, the periodic arrangement of dielectric inclusions forbids light propagation inside the sample, opening up energy band gaps in the photonic dispersion." https://lnkd.in/erZViDf View in LinkedIn