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¿ DELIRIO O REALIDAD ?
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Consideremos un auto esférico ¿ DELIRIO O REALIDAD ?
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Consideremos un auto esférico
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¿ Invisible? mmmm…….
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¿Y SI LE PONEMOS UN MANTO DE INVISIBILIDAD?
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¿Y SI LE PONEMOS UN MANTO DE INVISIBILIDAD?
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LIGHT SOURCE OBJECT METAMATERIAL LIGHT RAYS Cloaking Needed: no scattering (no reflections, no shadow)
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No reflection…? No shadow…? Victor Veselago
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No reflection…? No shadow…? Victor Veselago
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Consecuencias inmediatas: Efecto Doppler invertido Efecto Cherenkov invertido Angulo de refracción invertido
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Indice de refracción negativo n= -( k k n n n n Ley de Snell n= ( Triedro directo Triedro indirecto Onda incidente Onda transmitida (Gentileza A. Ourir)
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J. Pendry (2005)
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¿Verificación experimental?
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David Smith
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¿Verificación experimental? David Smith
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¿Verificación experimental? David Smith
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Efecto no tan inmediato:
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John Pendry
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Efecto no tan inmediato: John Pendry …the light is perfectly transmitted…
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Efecto no tan inmediato: John Pendry …the light is perfectly transmitted… …there is no physical obstacle to perfect reconstruction of the image beyond practical limitations of apertures and perfection of the lens surface… (Wavelength is not an obstacle!)
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Efecto no tan inmediato: Science 314, 979 (2006) John Pendry
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Efecto no tan inmediato: Science 314, 979 (2006) John Pendry
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Science 314, 979 (2006)
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Elemento esencial Ondas electromagnéticas en interacción con otros objetos.
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Elemento esencial Ondas electromagnéticas en interacción con otros objetos. Ondas en interacción con otros objetos.
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Elemento esencial Ondas electromagnéticas en interacción con otros objetos. Ondas de sonido en interacción con otros objetos.
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Elemento esencial Ondas electromagnéticas en interacción con otros objetos. Ondas de sonido en interacción con otros objetos. Ondas de superficie en interacción con otros objetos.
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Elemento esencial Ondas electromagnéticas en interacción con otros objetos. Ondas de sonido en interacción con otros objetos. Ondas de superficie en interacción con otros objetos.
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Elemento esencial Ondas electromagnéticas en interacción con otros objetos. Ondas de sonido en interacción con otros objetos. Ondas de superficie en interacción con otros objetos.
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Elemento esencial Ondas electromagnéticas en interacción con otros objetos. Ondas de sonido en interacción con otros objetos. Ondas de superficie en interacción con otros objetos.
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Elemento esencial Ondas electromagnéticas en interacción con otros objetos. Ondas de sonido en interacción con otros objetos. Ondas de superficie en interacción con otros objetos. ANR-CONICYT ProCoMedia Project
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NUEVOS MATERIALES Fernando Lund Academia Chilena de Ciencias, 26 de Septiembre de 2012
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Austenita: body centered tetragonal Martensita: face centered cubic Dos fases, dos estructuras cristalinas De interés actual: una de las dos fases no tiene estructura cristalina
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Altered states Computing: Phase-change memory chips, an emerging storage technology, could soon dethrone flash memory in smartphones, cameras and laptops
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Phase change materials: They can be rapidly and reversibly switched between the amorphous and crystalline states,
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Phase change materials: They can be rapidly and reversibly switched between the amorphous and crystalline states, Phys. Rev. Lett. 21, 1450 (1968)
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J. Appl. Phys. 69, 2849 (1991) Rapidphase transitions of GeTeSb 2 Te 3 pseudobinary amorphous thin films for an optical disk memory Noboru Yamada 1, Eiji Ohno 1, Kenichi Nishiuchi 1, Nobuo Akahira 1, and Masatoshi Takao 2 1 Information Equipment Research Laboratory, Matsushita Electric Industrial Co., Ltd, 315 YagumoNakamachi, Moriguchi, Osaka 570, Japan 2 Central Research Laboratories, Matsushita Electric Industrial Co., Ltd, 315 YagumoNakamachi, Moriguchi, Osaka 570, Japan TODAY:
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Unanswered question: Why is this transition so rapid?
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Unanswered question: Why is this transition so rapid? Little is known about the amorphous state
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Unanswered question: Why is this transition so rapid? Little is known about the amorphous state Glasses
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Unanswered question: Why is this transition so rapid? Little is known about the amorphous state Metallic glasses Glasses
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Unanswered question: Why is this transition so rapid? Little is known about the amorphous state Polymer glasses Metallic glasses Glasses
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Polymer glasses Metallic glasses Glasses Common (unexplained) properties:
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Polymer glasses Metallic glasses Glasses Common (unexplained) properties: Thermal behavior and mechanical response at low T
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Polymer glasses Metallic glasses Glasses Common (unexplained) properties: Thermal behavior and mechanical response at low T Vibration modes at THz frequencies
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Polymer glasses Metallic glasses Glasses Common (unexplained) properties: Thermal behavior and mechanical response at low T Vibration modes at THz frequencies Viscous behavior near the glass transition
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Polymer glasses Metallic glasses Glasses Common (unexplained) properties: Thermal behavior and mechanical response at low T Vibration modes at THz frequencies Viscous behavior near the glass transition Could they all have the same origin???
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Polymer glasses Metallic glasses Glasses Common (unexplained) properties: Thermal behavior and mechanical response at low T Vibration modes at THz frequencies Viscous behavior near the glass transition Could they all have the same origin??? Santiago Boston Los Alamos
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THE END
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Review Nature Materials 6, 824 - 832 (2007) doi:10.1038/nmat2009 There is an Erratum (November 2007) associated with this Review.Erratum (November 2007) associated with this Review. Subject Categories: Electronic materials | Semiconductors | Optical, photonic and optoelectronic materialsElectronic materials | Semiconductors | Optical, photonic and optoelectronic materials Phase-change materials for rewriteable data storage Matthias Wuttig1 & Noboru Yamada2 Abstract Phase-change materials are some of the most promising materials for data-storage applications. They are already used in rewriteable optical data storage and offer great potential as an emerging non-volatile electronic memory. This review looks at the unique property combination that characterizes phase-change materials. The crystalline state often shows an octahedral-like atomic arrangement, frequently accompanied by pronounced lattice distortions and huge vacancy concentrations. This can be attributed to the chemical bonding in phase-change alloys, which is promoted by p-orbitals. From this insight, phase- change alloys with desired properties can be designed. This is demonstrated for the optical properties of phase-change alloys, in particular the contrast between the amorphous and crystalline states. The origin of the fast crystallization kinetics is also discussed.
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Materials: An enabling technology
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METAMATERIALS Victor Veselago (b.1929)
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