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Monday, February 06, 2006

Invisible objects


When I was a child I used to attend phantasy'shows in local fairs. By then, one of my favorite shows was that of a woman spider's appearance-dissapearance. In minutes -to the interior of a small tent- with 10 spectators as maximal, a small woman ascended to the high thing of a stair, covered herself with a savannah and after throwing it, emerged a gigantic spider, crowned with the head of the woman. A fine and terrific show, of 3 minutes, made by modest circus agents. A show for the town. As the tent was of fabric, its holes permitted the ocular inquiry of those curious that always abound. When I asked them to explain the secret of the invisibility of the remainder of the body woman , they always said to me that it was a play of lights and nothing more.. Although until today, I ignore the disappearances technique, the up-to-date physic maintains that the human eye alone see those objects that have the capacity to reflect the light. If there is lack of reflections, the objects become invisible. This principle is worked today simultaneously in USA and Russia. In USA, the italian researchers :http://arxiv.org/ftp/cond-mat/papers/0502/0502336.pdf Andrea Alu and Nader Ingueta of the University of Pennsylvania, have theorized that if spherics and cylinders bodies are covered with plasmons (certain light with determined length of wave that penetrate metalic plates with holes), these become cuasi invisibles, due to the abrupt stopping of the dispersion of light. In Russia, http://english.pravda.ru/science/tech/04-02-2006/75417-invisible-0 Oleg Gamdomsky, from the Institute of Electronic Optic and Quantum Physic of the University of Ulyanovsk, said that he have achieved the same effect covering fixed objects, with superthins layers of colloidal gold.

Objetos invisibles.

Cuando niño solia asistir a espectáculos de fantasia en las ferias locales. Por ese entonces, uno de mis espectáculos favoritos era el de la aparición-desaparición de la mujer araña. En minutos -al interior de una carpa pequeña- con 10 espectadores como máximo, una pequeña mujer ascendia a lo alto de una escalera, se cubria con una sabana y luego tras tirarla, emergia una araña gigantesca, coronada con la cabeza de la mujer. Un fino y terrorifico espectáculo, de 3 minutos de duracion, efectivizado por modestos agentes circenses. Un espectáculo, para el pueblo. Como la carpa era de tela, sus agujeros permitian la pesquisa ocular de aquellos curiosos que siempre abundan. Cuando les exigia me develaran el secreto de la invisibilidad del resto del cuerpo de la mujer, siempre me decian que era un juego de luces y nada mas. Aunque hasta hoy, ignoro la técnica de estas desapariciones, la fisica actual, sostiene que el ojo humano solo ve a aquellos objetos que tienen la capacidad de reflejar la luz.. Si hay carencia de reflejos, los objetos se tornan invisibles. Este principio es trabajado hoy simultáneamente en USA y Rusia. En USA, las italianas: Andrea Alu y Nader Ingueta, investigadoras de la Universidad de Pennsylvania, han teorizado que si cuerpos esféricos y cilindros son cubiertos con http://bifi.unizar.es/events/zara2005/lmartin.html :plasmones (particulas de cierta longitud de onda que penetran placas metalicas con orificios) -al impedir abruptamente la dispersión de la luz, en estos objetos- los tornan casi invisibles. En Rusia, Oleg Gamdomsky, del Instituto de Optica Electrónica y Fisica Cuántica de la Universidad de Ulyanovsk, afirma haber logrado el mismo efecto cubriendo objetos fijos, con capas superfinas de particulas de oro coloidal.

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