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Time-of-flight imaging of invisibility cloaks

Halimeh, J. C.; Wegener, M.

As invisibility cloaking has recently become experimental reality, it is interesting to explore ways to reveal remaining imperfections. In essence, the idea of most invisibility cloaks is to recover the optical path lengths without an object (to be made invisible) by a suitable arrangement around that object. Optical path length is proportional to the time of flight of a light ray or to the optical phase accumulated by a light wave. Thus, time-of-flight images provide a direct and intuitive tool for probing imperfections. Indeed, recent phase-sensitive experiments on the carpet cloak have already made early steps in this direction. In the macroscopic world, time-of-flight images could be measured directly by light detection and ranging (LIDAR). Here, we show calculated time-of-flight images of the conformal Gaussian carpet cloak, the conformal grating cloak, the cylindrical free-space cloak, and of the invisible sphere. All results are obtained by using a ray-velocity equation of motion derived from Fermat’s principle.

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Verlagsausgabe §
DOI: 10.5445/IR/1000035157
Veröffentlicht am 07.11.2018
DOI: 10.1364/OE.20.000063
Zitationen: 13
Web of Science
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Physik (APH)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2012
Sprache Englisch
Identifikator ISSN: 1094-4087
KITopen-ID: 1000035157
HGF-Programm 43.14.01 (POF II, LK 01)
Photonics crystals and metamaterials
Erschienen in Optics Express
Band 20
Heft 1
Seiten 63-74
Nachgewiesen in Scopus
Web of Science
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