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We show that it is possible to achieve a perfect impedance matching by designing an antireflection temporal medium, which is omnidirectional and frequency-independent in an ultra-wide band. Our approach is an extension of the antireflection temporal coating by Pacheco-Pe~na et al [Optica 7, 323 (2020)]. We demonstrate that a specially-engineered multi-stage discrete or continuous temporal changing in the permittivity of the temporal medium allows ultra-wideband reflectionless wave propagation, which has been confirmed analytically and numerically. As an illustrative example for application, the proposed approach is applied to match a dielectric slab with free space for an ultra-wideband pulse.
In this paper, we propose a new approach for realizing antireflection coating using metamaterials. In this approach, a subwavelength array of metallic pillars (with square cross-section) is used for implementing antireflection coating. The effective
Meta-optics based on optically-resonant dielectric nanostructures is a rapidly developing research field with many potential applications. Halide perovskite metasurfaces emerged recently as a novel platform for meta-optics, and they offer unique oppo
An eight element, compact Ultra Wideband-Multiple Input Multiple Output (UWB-MIMO) antenna capable of providing high data rates for future Fifth Generation (5G) terminal equipments along with the provision of necessary bandwidth for Third Generation
We report on the group delay observed in continuous-wave terahertz spectroscopy based on photomixing with phase-sensitive homodyne detection. We discuss the different contributions of the experimental setup to the phase difference Deltaphi( u) betwee
Temporal interfaces introduced by abrupt switching of the constitutive parameters of unbounded media enable unusual wave phenomena. So far, their explorations have been mostly limited to lossless media. Yet, non-Hermitian phenomena leveraging materia