Working Principle of the Temporal Aiming Technique (IMAGE)
Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS
Caption
a, an incoming electromagnetic wave travels in an unbounded medium with an isotropic permittivity. b, by rapidly changing the permittivity of the medium in time from isotropic to an anisotropic tensor (with the x component of permittivity smaller than its z component) a temporal boundary is introduced producing forward and backward waves (equivalent to transmission and reflection at the interface between two media in the spatial domain). In this situation the direction of the wave vector remains the same while the energy propagation changes its direction following the direction of the Poynting vector S, eventually reaching receiver 2 (Rx2). c, a similar approach can be applied by properly engineering the temporal function of permittivity to allow the transmitted electromagnetic wave to be re-directed towards Rx1. d-e, Snapshots of the simulation results for the power distributions at times before and after the permittivity is changed from isotropic to anisotropic in real time, respectively, demonstrating how the energy changes its direction: temporal aiming.
Credit
by Victor Pacheco-Peña and Nader Engheta
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