What is it about?

Materials that have properties varying in space as well as with time are called space-time materials. Space-time microstructures often have temporal surfaces, or other space-time interfaces, at which the material moduli sharply change in time. The energy of a propagating wave is not conserved at these interfaces. Here we consider waves interacting with one or more temporal metasurfaces, where, by metasurface we mean that it has a tailored response to waves. This response is designed so that the energy is conserved when the material moduli are changed in time. Previously, an interesting application of time interfaces was demonstrated, where image reconstruction was achieved by pumping energy into the system. In our work, we achieve image reconstruction using the energy conserving temporal metasurfaces that we have proposed without any energy exchange with the system.

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Why is it important?

The energy exchange requirement of space-time materials was previously considered as an inherent characteristic of wave propagation through such materials. This presented an obstacle for realizing certain space-time materials due to the energy demands. This work presents a possible way of realizing energy conserving space-time materials with multiple time interfaces, which previously did not seem possible.

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This page is a summary of: An energy conserving mechanism for temporal metasurfaces, Applied Physics Letters, July 2022, American Institute of Physics, DOI: 10.1063/5.0097591.
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