Abstract
Previously [Courtial et al., Opt. Express 26, 17872 (2018)] we presented the theory of transformation optics (TO) with ideal lenses and demonstrated an example, an omnidirectional lens. Here we interpret this omnidirectional lens in two different parameter regimes as ideal-lens cloaks that employ different cloaking strategies: a standard "shrink cloak" in which objects appear smaller (ideally zero) and a novel "abyss cloak" in which interior physical-space positions are mapped to the exterior and thus are visible only from certain directions. We proceed to combine two nested abyss cloaks into another novel, omnidirectional, "bi-abyss cloak." Our work significantly extends the arsenal of cloaking strategies.
Highlights
Transformation optics (TO) [1,2] is the science of using a material structure to distort light-ray trajectories within the structure such that the apparent shape and/or size of any object inside it is changed
Express 26, 17872 (2018)] we presented the theory of transformation optics (TO) with ideal lenses and demonstrated an example, an omnidirectional lens
We interpret this omnidirectional lens in two different parameter regimes as ideal-lens cloaks that employ different cloaking strategies: a standard “shrink cloak” in which objects appear smaller and a novel “abyss cloak” in which interior physical-space positions are mapped to the exterior and are visible only from certain directions
Summary
Transformation optics (TO) [1,2] is the science of using a material structure to distort light-ray trajectories within the structure such that the apparent shape and/or size of any object inside it is changed. When an object is placed in certain regions, the distortion — the 3D mapping between physical (object) positions and their apparent (image) positions when viewed from the outside — is that of an ideal lens, and as the distorted object can be viewed from any direction, this structure is an omnidirectional lens.
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