Invisibility cloak capable of hiding an object can be achieved by properlymanipulating electromagnetic field. Such a remarkable ability has been shown intransformation and ray optics. Alternatively, it may be realistic to create aspatial cloak by means of confining electromagnetic field in three-dimensionalarrayed waveguides and introducing appropriate collective curvature surroundingan object. We realize the artificial structure in borosilicate by femtosecondlaser direct writing, where we prototype up to 5000 waveguides to concealmillimeter-scale volume. We characterize the performance of the cloak bynormalized cross correlation, tomography analysis and continuousthree-dimensional viewing angle scan. Our results show invisibility cloak canbe achieved in waveguide optics. Furthermore, directly printed invisibilitycloak on a photonic chip may enable controllable study and novel applicationsin classical and quantum integrated photonics, such as invisualising a couplingor swapping operation with on-chip circuits of their own.
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