Terahertz Gap Case Study

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

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