![]() Negative refraction in time-varying strongly coupled plasmonic-antenna–epsilon-near-zero systems. Broadband nonreciprocal amplification in luminal metamaterials. Nonreciprocal gain in non-Hermitian time-Floquet systems. Non-reciprocal photonics based on time modulation. An electronic-based model of the optical nonlinearity of low density Drude materials. All-optical switching of an epsilon-near-zero plasmon resonance in indium tin oxide. Saturable time-varying mirror based on an epsilon-near-zero material. Large optical nonlinearity of indium tin oxide in its epsilon-near-zero region. Optical time reversal from time-dependent epsilon-near-zero media. Spatiotemporal refraction of light in an epsilon-near-zero indium tin oxide layer: frequency shifting effects arising from interfaces. Broad frequency shift of parametric processes in epsilon-near-zero time-varying media. Broadband frequency translation through time refraction in an epsilon-near-zero material. Diffraction of matter waves in space and in time. Atomic wave diffraction and interference using temporal slits. Szriftgiser, P., Guéry-Odelin, D., Arndt, M. This result enables the further exploration of time-varying physics, towards the spectral synthesis of waves and applications such as signal processing and neuromorphic computation. Surprisingly, many more oscillations are visible than expected from existing theory, implying a rise time that approaches an optical cycle. The separation between time slits determines the period of oscillations in the frequency spectrum, whereas the decay of fringe visibility in frequency reveals the shape of the time slits. The ‘time slits’, narrow enough to produce diffraction at optical frequencies, are generated from the optical excitation of a thin film of indium tin oxide near its epsilon-near-zero point. Here we report such a time-domain version of the classic Young’s double-slit experiment: a beam of light twice gated in time produces an interference in the frequency spectrum. Yet, the temporal counterpart of Young’s double-slit experiment-a wave interacting with a double temporal modulation of an interface-remains elusive. Double-slit experiments-where a wave is transmitted through a thin double aperture in space-have confirmed the wave–particle duality of quantum objects, such as single photons, electrons, neutrons, atoms and large molecules.
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