Skip to main content
UploadLanguage (EN)Support
BusinessMobileSocial MediaMarketingTechnologyArt & PhotosCareerDesignEducationPresentations & Public SpeakingGovernment & NonprofitHealthcareInternetLawLeadership & ManagementAutomotiveEngineeringSoftwareRecruiting & HRRetailSalesServicesScienceSmall Business & EntrepreneurshipFoodEnvironmentEconomy & FinanceData & AnalyticsInvestor RelationsSportsSpiritualNews & PoliticsTravelSelf ImprovementReal EstateEntertainment & HumorHealth & MedicineDevices & HardwareLifestyle
SOUMEN GIRI, profile picture
Uploaded bySOUMEN GIRI
PPTX, PDF5,882 views

METAMATERIALS

This document discusses metamaterials. Metamaterials are artificial materials engineered to have properties that are not found in nature. They are made of assemblies of multiple conventional elements arranged in periodic patterns which give them properties that depend on geometry rather than chemical composition. Negative refractive index can be achieved when the permeability and permittivity are both negative. Potential applications of metamaterials include invisibility cloaks, superlenses, antennas, and absorbing light. Further work is needed to optimize fabrication processes and characterize more complex 3D metamaterial structures.

Education◦
METAMATERIALS SOUMEN GIRI ROLL NO.- 16MS6019 Materials Science centre IIT KHARAGPUR
What is a metamaterial?  Metamaterials are made from assemblies of multiple individual elements fashioned from conventional microscopic materials such as metals or plastics, but the materials are usually arranged in periodic patterns.
METAMATERIAL BACKGROUND  Do not depend upon chemical composition  Depend on the geometry of the structure units.  Metamaterials are artificial engineered composite structures.  Not commonly found in nature.
BACKGROUND 𝜀,   0  0   0    0  0  0   0  0 
Refractive Index  The refractive index, n, of a medium is defined as the ratio of the speed, C, of a wave phenomenon such as light or sound in a reference medium to the phase Velocity Vp, of the wave in the medium.  n = C / Vp = r  r
NEGATIVE REFRACTIVE INDEX How to achieve negative refractive index? n  r  r Negative refractive index can be achieved when (r and r ) are negative = = -1
DNG medium DPS medium E E S S HH Left handed medium and right handed medium
Negative refractive index a) Calculated ray-tracing image of a metal rod in an empty drinking glass. b) Same scenery, but the glass is filled with normal water, n 1.3 , leading to ordinary refraction. c) The water is replaced by “water” with a fictitious refractive index of n  1.3
E k H Double Negative Material Left handed Material S Other names Negative refractive index material
MANUFACTURING Upto today metamaterials have mostly been manufractured by the technology electron beam lithography. Thease technique have the disadvantage of being quite expansive and slow and obtaining large areas. Material science and technologies currently under investigation to fabricate metamaterials are self assembly.
 At microwave frequencies, the first real invisibility cloak was realized in 2006. However, only a very small object was imperfectly hidden.  In 2007, one researcher stated that for metamaterial applications to be realized, several goals must be achieved. GOAL OF DEVELOPMENT
Application of Metamaterials  Metamaterial antenna  Cloaking device  Superlens  Invisible Submarines  Photonics OR opto-electronics  Create the oft-discussed, Invisible Man  Perfect Absorber of light  Ultra high capacity storage devices etc.
Metamaterial antenna • Metamaterial antennas are a class of antennas which use metamaterials to increase performance of miniaturized (electrically small) antenna systems. • Metamaterial antennas radiate as much as 95 percent of an input radio signal. • Experimentally metamaterial antennas are as small as one-fiftieth of a wavelength and could have further decrease in size. • Some applications for metamaterial antennas are wireless communications, space communication, satellites etc.
Metamaterial cloaking Metamaterial cloaking is the usage of materials in an invisibility cloak. Metamaterials direct and control the propagation and transmission of specified paths of the light spectrum and demonstrate the potential to render an object seemingly invisible.
Superlens • A practical superlens is a lens which uses metamaterials to go beyond the diffraction limit. The diffraction limit is a feature of convectional lenses and microscopes that limits the fineness of their resolution. Many lens designs have been proposed that go beyond the diffraction limit in some way but there are constraints and obstacles involved in realizing each of them.
Future Work • Optimize process • Create more complicated 3D structures • Characterize 3D structure properties • Explore new thickness and exposure times
REFERENCES • https://en.wikipedia.org/wiki/Metamaterial • Nanostructured Metamaterials, By Anne F.de Baas
METAMATERIALS