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Article Dans Une Revue Applied Physics Letters Année : 2023

Subwavelength pulse focusing and perfect absorption in the Maxwell fish-eye

Résumé

Maxwell's fish-eye is a paradigm for an absolute optical instrument with a refractive index deduced from the stereographic projection of a sphere on a plane. We investigate experimentally the dynamics of flexural waves in a thin plate with a thickness varying according to the Maxwell fish-eye index profile and a clamped boundary. We demonstrate subwavelength focusing and temporal pulse compression at the image point. This is achieved by introducing a sink emitting a cancelling signal optimally shaped using a time-reversal procedure. Perfect absorption and outward going wave cancellation at the focus point are demonstrated. The time evolution of the kinetic energy stored inside the cavity reveals that the sink absorbs energy out of the plate ten times faster than the natural decay rate.
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Dates et versions

hal-04472601 , version 1 (22-02-2024)

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Gautier Lefebvre, Marc Dubois, Younes Achaoui, Ros Kiri Ing, Mathias Fink, et al.. Subwavelength pulse focusing and perfect absorption in the Maxwell fish-eye. Applied Physics Letters, 2023, 123 (13), ⟨10.1063/5.0170815⟩. ⟨hal-04472601⟩
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