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

Gautier Lefebvre; Marc Dubois; Younes Achaoui; Ros Kiri Ing; Mathias Fink; Sébastien Guenneau; Patrick Sebbah

doi:10.1063/5.0170815

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

Gautier Lefebvre, Marc Dubois, Younes Achaoui, Ros Kiri Ing, Mathias Fink, Sébastien Guenneau, Patrick Sebbah

Department of Physics

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

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.

Original language	English
Article number	132203
Journal	Applied Physics Letters
Volume	123
Issue number	13
DOIs	https://doi.org/10.1063/5.0170815
State	Published - 25 Sep 2023

Bibliographical note

Publisher Copyright:
© 2023 Author(s).

Funding

P.S. acknowledges the Agence Nationale de la Recherche support under Grant ANR PLATON (No. 12-BS09-003-01), the LABEX WIFI (Laboratory of Excellence within the French Program Investments for the Future) under Reference No. ANR-10-IDEX-0001-02 PSL*, and the Groupement de Recherche 3219 MesoImage. and were created by company 3DBM.

Funders	Funder number
LABEX WIFI	ANR-10-IDEX-0001-02 PSL
Agence Nationale de la Recherche	12-BS09-003-01

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

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