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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

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

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

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

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

NEW ELECTROMAGNETISM. "Recently, metamaterials that display negative refractive index – a property not found in any known naturally occurring material – have drawn significant scientific interest, underscoring the remarkable potential of metamaterials to facilitate new developments in electromagnetism." https://lnkd.in/ePVzVDS View in LinkedIn

RETHINKING MATERIALS. "Artificial magnetism and negative refractive index are two specific types of behavior that have been demonstrated over the past few years, illustrating the new physics and new applications possible when we expand our view as to what constitutes a material." https://lnkd.in/ewjS99N View in LinkedIn

LEFT-HANDED METAMATERIALS have a negative refractive index. "Metamaterials which exhibit a negative value for the refractive index such as negative index materials are often referred to by any of several terminologies: left-handed media or left-handed material (LHM), backward wave media (BW media), media with negative refractive index, double negative (DNG) metamaterials, and other similar names." https://lnkd.in/eqteM9a View in LinkedIn

EXTREME VALUES. "Chiral metamaterials – artificial subwavelength structures with broken mirror symmetry – demonstrate outstanding degree of optical chirality that exhibits sophisticated spectral behavior and can eventually reach extreme values." https://lnkd.in/eeFhghq View in LinkedIn

CHIRALITY ROOT. "A material such as a surface plasmon that has either (but not both) ε or µ negative is often opaque to electromagnetic radiation. However, anisotropic materials with only negative permittivity can produce negative refraction due to chirality." https://lnkd.in/eMWCxE4 View in LinkedIn