Abstract
Wormholes are fascinating cosmological objects that can connect two distant regions of the universe. Because of their intriguing nature, constructing a wormhole in a lab seems a formidable task. A theoretical proposal by Greenleaf et al. presented a strategy to build a wormhole for electromagnetic waves. Based on metamaterials, it could allow electromagnetic wave propagation between two points in space through an invisible tunnel. However, an actual realization has not been possible until now. Here we construct and experimentally demonstrate a magnetostatic wormhole. Using magnetic metamaterials and metasurfaces, our wormhole transfers the magnetic field from one point in space to another through a path that is magnetically undetectable. We experimentally show that the magnetic field from a source at one end of the wormhole appears at the other end as an isolated magnetic monopolar field, creating the illusion of a magnetic field propagating through a tunnel outside the 3D space. Practical applications of the results can be envisaged, including medical techniques based on magnetism.
Highlights
Wormholes are fascinating cosmological objects that can connect two distant regions of the universe
We experimentally show that the magnetic field from a source at one end of the wormhole appears at the other end as an isolated magnetic monopolar field, creating the illusion of a magnetic field propagating through a tunnel outside the 3D space
We take advantage of the possibilities that magnetic metamaterials offer for shaping static magnetic fields
Summary
A theoretical proposal by Greenleaf et al presented a strategy to build a wormhole for electromagnetic waves. Based on metamaterials, it could allow electromagnetic wave propagation between two points in space through an invisible tunnel. Greenleaf et al presented a theoretical proposal for designing a wormhole for electromagnetic waves[3]. Such an object could allow electromagnetic wave propagation between two points in space through an invisible tunnel. In this work we construct an actual 3D wormhole for magnetostatic fields It will allow the passage of magnetic field between distant regions while the region of propagation remains magnetically invisible. Metamaterials built from different combinations of them have enabled the realization of magnetic cloaks[19,20,21] and other devices for shaping magnetic fields[22,23,24,25]
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