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Towards photonic time-crystals: observation of a femtosecond time-boundary in the refractive index

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Abstract

We demonstrate experimentally a time-boundary for photons in a dielectric medium, analogous to a spatial boundary. Such abrupt temporal changes in the permittivity are necessary for observing time-reflections, photonic time-crystals and momentum bandgaps.

© 2021 The Author(s)

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