Terahertz Gap Case Study

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1.2 Terahertz Gap:
The gap between electronic band and photonic band is called as Terahertz gap. [2] Fig 2: Terahertz Gap [2]
The terahertz portion of the EM spectrum lies between microwaves and the infrared. Typically it is extended from about 0.3 THz (a wavelength of 1 mm ) to around 10 THz ( a wavelength of 30 µm). There is several fast growing interests in this spectral region [1].
1) THz waves can penetrate a wide variety of non-conducting materials.
2) They can pass through clothing, paper, cardboard, wood, plastic, ceramics.
1.3 Terahertz applications
Terahertz applications are being explored aggressively in a few areas that have the greatest potential of achieving entirely new capabilities [1]. Fig 3: Terahertz Applications
2. Introduction to Metamaterials
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It enabled structuring of materials which manipulate EM wave beams exhibit some properties surprisingly in manners previously unimaginable namely backward propagation, dopler effect, reverse vavilov-Cerenkov effect [3], negative refraction [4,5], cloaking [6]. All these properties depends on the structurization of the metameterial molecules rather than composition [7]. Theoretically these materials are proposed by pendry et al.[4]. And demonstrated experimentally by smith et al.[6]. Metamaterials have gained the attraction by various research teams in recent years because of wide application in Microwave, Terahertz, optical frequencies

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