Membranes and invisibility cloaks

Abstract

Pioneering theoretical works of transformation optics and conformal mapping have scientifically scrutinized existence of invisibility cloaks. Inspirational theoretical works of Pendry and Leonhardt significantly amplified and accelerated search of metamaterials acting as invisibility cloak. Consequently, invisibility cloaks at micro, optical and visible frequencies have been found. However, despite of progress theoretical works also indicated that invisibility cloaks retain size dependence dictated by incident wavelength and for visible light must remain tiny.