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A Maxwell fish-eye lens in a Bose-Einstein condensate

We experimentally realize an analogue of the optical Maxwell fish-eye lens (MFEL) using phononic excitations in a Bose-Einstein condensate (BEC). A MFEL is characterized by a radially symmetric, spatially varying refractive index with the remarkable property that rays emitted from any point within t...

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Bibliographic Details
Main Authors: Duchene, Jelte (Author) , Kath, Elinor (Author) , Arrouas, Floriane (Author) , Jang, Hanyi (Author) , Strobel, Helmut (Author) , Oberthaler, Markus K. (Author) , Mehta, Jay (Author) , Farrell, Liam M (Author) , Kirkby, Wyatt (Author) , O’Dell, Duncan H J (Author)
Format: Article (Journal)
Language:English
Published: 19 June 2026
In: New journal of physics
Year: 2026, Volume: 28, Issue: 6, Pages: 1-11
ISSN:1367-2630
DOI:10.1088/1367-2630/ae774d
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1088/1367-2630/ae774d
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Author Notes:Jelte Duchêne, Elinor Kath, Floriane Arrouas, Hanyi Jang, Helmut Strobel, Markus K Oberthaler, Jay Mehta, Liam M Farrell, Wyatt Kirkby and Duncan HJ O’Dell
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Summary:We experimentally realize an analogue of the optical Maxwell fish-eye lens (MFEL) using phononic excitations in a Bose-Einstein condensate (BEC). A MFEL is characterized by a radially symmetric, spatially varying refractive index with the remarkable property that rays emitted from any point within the lens are perfectly focused at their antipodal points. While the implementation of such gradient-index lenses is challenging in conventional optical systems, BECs offer a highly tunable platform in which the spatially varying speed of sound of collective excitations—phonons, the acoustic analogues of photons—can be engineered and their dynamics observed in real time. Time-resolved measurements of phonon wavefronts reveal focusing behavior that shows good agreement with analytical theory and numerical simulations. This work provides both a geometric and physical framework for engineering effective refractive indices using ultracold atoms, and simulating wave propagation on effective spherical geometries.
Item Description:Veröffentlicht: 19. Juni 2026
Gesehen am 04.09.2026
Physical Description:Online Resource
ISSN:1367-2630
DOI:10.1088/1367-2630/ae774d

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