Invisibility materials are a step closer, as scientists and engineers at Harvard University have now successfully constructed metamaterials with a negative refractive index as strong as -700. This is an article to contemplate very carefully:
Towards miniaturization of metamaterials: Reluctant electrons enable 'extraordinarily strong' negative refraction Read more at: http://phys.org/news/2012-08-miniaturization-metamaterials-reluctant-electrons-enable.html#jCp
What interests me here is that the technique being argued in this short article is a familiar one, in fact, it is so familiar and for that matter, so old, that it is (to use the expression) "a bit creepy," for it harkens back to some of the rationalizations behind the famous Philadelphia Experiment that I encountered when researching my book Secrets of the Unified Field: the Philadelphia Experiment, the Nazi Bell, and the Discarded Theory. There, the trick had been concerned not with refractive indices but with impedances, and the scientist who explained what to do - and what the Nazis were attempting to do with their radar invisibility experiments - was Einstein associate Arnold Sommerfeld. Here is they way I presented his argument in Secrets of the Unified Field:
"Sommerfeld begins his discussion by noting the case when two media - the air and the target - are of unequal magnetic permeabilities...
Sommerfeld then states quite directly:
"During the war the problem arose to find, as a counter measure to Allied radar, a largely non-reflecting ("black") surface layer of small thickness. This layer was to be particularly non-reflecting for perpendicular or almost perpendicular incidence of the radar wave. In this case the angle of incidence and the angle of transmission are both almost equal zero. The problem is solved by making the ratio of the two wave impedances almost equal to unity...." (Secrets of the Unified Field, pp. 171-172).
Thus, for the Nazis, the key was not the index of refraction but the ratio of wave impedances.(p. 172).Sommerfeld puts it this way:
"In order to 'camouflage' an object against radar waves, one must cover it with a layer for which this ratio of wave resistances has the value of 1 in the region of centimeter waves..."(op. cit., p. 174)
Well and good, and it was a rather simple and brilliant expedient, one within the capabilities of the day. But now the new Harvard study opens up the possibilities - far distant to be sure - that materials engineering itself will provide new capabilities for "invisibility" materials, not dependent upon such a "clumsy" approach, and one moreover with implications for the entire spectrum of electromagnetic radiation, in other words, with implications for optical, as well as radar, stealth properties, for with such high negative refractive indices, incident electromagnetic radiation on such materials would be "bent" in such a manner that reflection would not occur...one would have a kind of bent reflection (of course, this does not completely render radar stealth, since radar is not merely a "bounce" but also a secondary transmitter and resonance effect).
What does all this complicated jargon boil down to? Simply this: materials engineering and experimental science took yet another step closer to Marduk's "invisibility" suit, recorded in the Babylonian war epic, the Enuma Elish...
See you on the flip side.