Object Independent Invisibility Cloak In Specific Pre-defined Area Based On Metamaterials

Transformation Optics provides new possibilities to design devices of extraordinary functions such as concealing of object by using metamaterials.One of the most important use of transformation optics is to make objects invisible by using metamaterials,which was never possible before.In fact,it was the dream of man to make something invisible which actually exists.So far,different kind of outstanding devices have been introduced by designing the metasurfaces and guiding the EM waves in prescribed way.In transformation optics,electromagnetic waves are controlled by changing the constitutive parameters of metasurfaces and electromagnetic waves are directed to propagate in required direction.After the exploration of metamaterials,different design and shapes of metamaterials have been studied and can be used in different kind of applications.In this work,Invisible cloaked region has been designed by using metamaterials and object independent invisibility inside specific area is introduced,where inside specific region position and quantity of objects can be changed in limited region but the object inside this specific region remains invisible.To demonstrate it experimentally,rhombic shaped cloaking shell has been designed,which is made of highly transparent metasurfaces and geometry of this area is designed in such a way that all electromagnetic waves are passed around the object without reaching inside the cloaked area.Other cloaking methods usually requires object dimension details to hide something but in this method there will be no need of such kind of details to hide the object which make this method very important in scientific point of view.The proposed creation of cloaked region by using metamaterials and methodology of transformation optics is very useful in many sectors of life,especially in military and medical sector.A very important and perfect use is to design non-contact device for radio frequency shielding such that radar will be not able to detect any object due to transformation of electromagnetic rays around and the object.Furthermore,the effect of cloaking has been verified by performing full-wave simulations in COMSOL(simulation software)to verify the results.Hamilton equation provides very important information in wave guiding and particle tracing.In co-ordinates transformation,Maxwell equation plays very important rule and help us to construct a medium from physical space to virtual space.The major area of my master study is to design and create an invisible cloaked region,to get optics illusion in specific predefined area and to implement this method in,radio frequency shielding and surface wave guiding.In addition,I continued the same concept and applied to make active sources,e.g.antennas and heat flux guiding in remote way by using transformation optics.This work is under study and soon it will be ready to submit.