Metamaterials: Negative refractive index in ... - Theory.nipne.ro

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2.2. <strong>Metamaterials</strong>: formal def<strong>in</strong>ition• 2001: Rodger Walser, University of Texas, Aust<strong>in</strong>, <strong>in</strong>troduces(published paper) the term "metamaterial" referr<strong>in</strong>g to artificialcomposites that "...have performances beyond the limitations ofconventional composites".• 2001: Valerie Brown<strong>in</strong>g, Stu Wolf, DARPA (Defense AdvancedResearch Projects Agency), extend the def<strong>in</strong>ition <strong>in</strong> the context of theDARPA <strong>Metamaterials</strong> program :<strong>Metamaterials</strong> are a new class of ordered nanocomposites that exhibitexceptional properties not readily observed <strong>in</strong> nature. These propertiesarise from qualitatively new response functions that are: (1) notobserved <strong>in</strong> the constituent materials and (2) result from the <strong>in</strong>clusion ofartificially fabricated, extr<strong>in</strong>sic, low dimensional <strong>in</strong>homogeneities.ASTiGMAT
More def<strong>in</strong>itionsMeta- denotes position beh<strong>in</strong>d, after, or beyond, and also someth<strong>in</strong>g of a higher orsecond-order k<strong>in</strong>d. . .a) Short and general: Metamaterial is an arrangement of artificial structuralelements, designed to achieve advantageous and unusual properties.b) Long: Metamaterial is an artificial material possess<strong>in</strong>g eng<strong>in</strong>eered effectiveelectromagnetic properties result<strong>in</strong>g from response functions not found <strong>in</strong>constituent materials and not readily observed <strong>in</strong> nature. *c) Narrow: Metamaterial is an artificial material whose effective properties cannotbe determ<strong>in</strong>ed by only material parameters, shape, and concentration of theconstituent <strong>in</strong>clusions.*Based on the def<strong>in</strong>ition of J. Pendry, 2000.(S. Tretyakov, Hels<strong>in</strong>ki University of Technology, SMARAD Centre ofExcellence, September 2006; Director of Metamorphose – European Network ofExcellence)ASTiGMAT
Page 1 and 2: IFIN_Theor_Phys_Dept_111810
Page 3 and 4: 1. GoalIntroduction to the field of
Page 5: Metamaterials and
Page 9 and 10: Founders of the modern metamaterial
Page 11 and 12: Pendry’s structures to obta<stron
Page 13 and 14: Examples of "old" resultsWire media
Page 15 and 16: Specially dedicated journal- <stron
Page 17 and 18: Metamorphose-organized conferences
Page 19 and 20: 3. MetaPhysics of metamaterials: Ho
Page 21 and 22: Electromagnetic field spectrum≈ 8
Page 23 and 24: 3.2. Definition of
Page 25 and 26: 3.4. Examples of Pendry periodical
Page 27 and 28: Effective relative magnetic permeab
Page 29 and 30: Idealized hypotheses (in</s
Page 31 and 32: Generalized cell for NRI-transmissi
Page 33 and 34: 4.1. Negative refr
Page 35 and 36: 4.2. Behavior of convex and concave
Page 37 and 38: 4.4. Goos-Hänchen shift (effect)-
Page 39 and 40: "Ideal lens" - simplified descripti
Page 41 and 42: Partial conclusion and comments- On
Page 43 and 44: First experiments (2000-2001)1-D Me
Page 45 and 46: First experimentsNegative</
Page 47 and 48: Progress, microwavesExperiment to v
Page 49 and 50: Progress: from microwaves toward op
Page 55 and 56: Progress: near inf
Page 57 and 58:
Progress: visible (2007)ASTiGMAT
Page 59 and 60:
Swiss cross configuration (2009)New
Page 61 and 62:
Mother Nature and PhCQuasi-periodic
Page 63 and 64:
7. High-interest p
Page 65 and 66:
Another slab (Veselago-Pendry-type)
Page 67 and 68:
7.1. Toward imagin
Page 69 and 70:
Example of partial camouflage, obta
Page 71 and 72:
Total invisibility
Page 73 and 74:
Results: invisibil
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New (2008) cloakin
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New (2009) reported cloakin
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9. Conclusion- MTM is a fasc<strong
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