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Article
Physics, Multidisciplinary
Romain Tirole et al.
Summary: A temporal version of Young's double-slit experiment shows interference in the frequency domain when light interacts with time slits produced by ultrafast changes in the refractive index.
Article
Physics, Multidisciplinary
Emanuele Galiffi et al.
Summary: Coherent wave control is used to suppress or enhance outgoing signals by exploiting the interference of multiple waves. In this study, we explore the temporal analogue of this phenomenon, showcasing ultrabroadband temporal coherent wave control using time interfaces. We demonstrate the photonic analogue of mechanical collisions with adjustable phase features, enabling the erasure, enhancement, and reshaping of optical pulses. This research provides a pathway for sculpting broadband light without spatial boundaries, within an ultrafast and low-energy platform.
Article
Materials Science, Multidisciplinary
Joao C. Serra et al.
Summary: Topological photonics is a general framework for designing unidirectional edge waveguides and other platforms with extreme nonreciprocal wave phenomena. This study focuses on the topological classification of photonic crystals formed by inclusions subjected to spacetime rotating-wave modulation. The results show that these crystals have a bianisotropic response that breaks time-reversal symmetry and can lead to nontrivial topologies. A proposal for implementing the Haldane model in a spacetime modulated photonic crystal is also presented.
Article
Nanoscience & Nanotechnology
Eran Lustig et al.
Summary: We experimentally study optical time-refraction caused by time-interfaces as short as a single optical cycle. By observing the propagation of a probe pulse through a sample with a large refractive index change induced by an intense modulator pulse, we find that increasing the refractive index abruptly leads to red-shifted waves while decreasing it back to the original value causes a subsequent blue-shift. Shortening the temporal width of the modulator pulse leads to a proportionally shorter rise time of the red-shift associated with time-refraction. These experiments are conducted in transparent conducting oxides acting as epsilon-near-zero materials. The findings stimulate questions about the fundamental physics in ultrashort time frames and pave the way for future experiments with photonic time-crystals generated by periodic refractive index changes.
Article
Nanoscience & Nanotechnology
Giuseppe Castaldi et al.
Summary: The study focuses on the design and application of multisection quarter-wave impedance transformers in microwave engineering and optics. By utilizing time-varying metamaterials, a formal analogy is derived between the spectral responses and temporal analogs of these structures, showcasing the potential of space-time duality in synthesis approaches. The results, validated through full-wave numerical simulations, offer new insights into wave dynamics in time-varying media and could have important applications in space-time metastructures for broadband frequency conversion and analog signal processing.
Article
Physics, Applied
P. A. Huidobro et al.
Summary: The paper introduces a general framework for the homogenization theory of space-time metamaterials, deriving analytical formulas for effective material parameters in the low-frequency limit for traveling-wave modulations. It shows how synthetic motion can lead to giant bianisotropy and how modulation speed and phase can tune the nonreciprocal response. The theory is applied to derive exact formulas for the Fresnel drag in electromagnetic media with traveling-wave modulations, providing insight into differences and similarities between synthetic motion and moving matter.
PHYSICAL REVIEW APPLIED
(2021)
Article
Engineering, Electrical & Electronic
Christophe Caloz et al.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2020)
Article
Physics, Multidisciplinary
Vincent Bacot et al.
Article
Physics, Multidisciplinary
Y. D. Chong et al.
PHYSICAL REVIEW LETTERS
(2010)
