Month: September 2022

NEGATIVE REFRACTIVE INDEX. "The refractive index determines the amount by which the beam is deflected. If the index is positive, the exiting beam is deflected to the opposite side of the surface normal, whereas if the index is negative, the exiting beam is deflected the same side of the normal." Throw out the old textbooks! https://lnkd.in/ewjS99N View in LinkedIn

CHALLENGED AND NAILED. "In 2001, a Snell’s law experiment was performed on a wedge-shaped metamaterial designed to have a negative index of refraction at microwave frequencies." https://lnkd.in/ewjS99N View in LinkedIn

CHALLENGED AND NAILED. "The theoretical foundation of negative refraction was challenged in 2002. The theoretical issue was subsequently addressed by several authors, who concluded that, indeed, time-varying signals could also be negative refracted." https://lnkd.in/ewjS99N View in LinkedIn

NEW PARADIGM. "Having established the reality of negative refraction, we are now free to investigate other phenomena related to negative index materials. We quickly find that some of the most long-held notions related to waves and optics must be rethought!" https://lnkd.in/ewjS99N View in LinkedIn

PHOTONIC CRYSTALS (AGAIN). "In 2000, it was shown theoretically that several photonic crystal configurations could exhibit the same types of optical phenomena predicted for negative index materials, including negative refraction and imaging by a planar surface." https://lnkd.in/ewjS99N 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

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

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

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 (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