Abstract
Abstract We theoretically investigate the illusion device designed by a conformal transformation that can render an elliptic defect behave like a flat mirror. Different from illusion devices consisting of the complementary medium and anti-object with negative permittivity and permeability, our proposed illusion device requires only isotropic positive permittivity medium. It offers a possible route to eliminate the lateral shift in the conventional quasi-conformal carpet cloak. Interestingly, with the same conformal transformation, we can achieve an impedance-matched flat absorber by simply varying the shape and the refractive index of the defects. Both the illumination device and the absorber in our design have broad bandwidth, wide-illumination range and polarization-insensitive performance.
Highlights
Supported by the development of metamaterials, transformation optics (TO) offers capability to steer electromagnetic waves along arbitrary trajectories [1,2,3,4,5,6,7,8,9]
We theoretically investigate the illusion device designed by a conformal transformation that can render an elliptic defect behave like a flat mirror
We analytically retrieve the light trajectories in the transformed illusion device and black hole
Summary
Supported by the development of metamaterials, transformation optics (TO) offers capability to steer electromagnetic waves along arbitrary trajectories [1,2,3,4,5,6,7,8,9]. TO can be applied to design metamaterial absorbers. Narimanov and Kildishev theoretically proposed optical black holes that can absorb light with broad frequency band [33]. Chen et al applied the transformation optics to realize Schwarzchild black hole and investigated its absorption property [36]. Sheng et al mimicked the gravitational lensing through a microstructured optical waveguide, which can be applied to an omnidirectional absorber [37]. All, both illusion optics and absorber design guided by transformation optics have been demonstrated separately, but never been realized by using one single coordinate transformation
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