Yakir Hadad
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View article: Wave Phenomena in Time-Dependent, Active and Topological Photonic Media: feature introduction
Wave Phenomena in Time-Dependent, Active and Topological Photonic Media: feature introduction Open
Time-dependent, active, and topological photonic platforms are redefining what light can do in materials engineered beyond the traditional passive and stationary regime. They unlock nonreciprocity without magnets, energy exchange between w…
View article: Universal transient radiation dynamics by abrupt and soft temporal transitions in optical waveguides
Universal transient radiation dynamics by abrupt and soft temporal transitions in optical waveguides Open
When an excited electromagnetically open optical waveguide goes through a temporal transition of its material properties, it radiates to the ambient surroundings. In this paper, we explore this radiation and reveal, using asymptotic evalua…
View article: Loss vs Magnetization Threshold Phenomenon for Lorentz Nonreciprocity Induced by a Gyrotropic Particle Inside a Cavity
Loss vs Magnetization Threshold Phenomenon for Lorentz Nonreciprocity Induced by a Gyrotropic Particle Inside a Cavity Open
When a plasmonic particle is subject to a static magnetic field, ${B}_{\rm dc}=B_{0} \hat{z}$, its gyrotropic response gives rise to nonreciprocal dynamics of the entire ambient surroundings. This dynamics depends on the particle's excitat…
View article: Exact Formulation of the Resonant Coupling of a Deep-Subwavelength Particle in a Rectangular Conducting Cavity: Beyond the Jaynes-Cummings Model
Exact Formulation of the Resonant Coupling of a Deep-Subwavelength Particle in a Rectangular Conducting Cavity: Beyond the Jaynes-Cummings Model Open
We investigate the resonant interaction between a deep-subwavelength particle and a perfectly conducting rectangular cavity, with potential applications in cavity classical and quantum electrodynamics and wave physics. The particle may beh…
View article: Situational Awareness Classification Based on EEG Signals and Spiking Neural Network
Situational Awareness Classification Based on EEG Signals and Spiking Neural Network Open
Situational awareness detection and characterization of mental states have a vital role in medicine and many other fields. An electroencephalogram (EEG) is one of the most effective tools for identifying and analyzing cognitive stress. Yet…
View article: Time–frequency analysis using spiking neural network
Time–frequency analysis using spiking neural network Open
Time–frequency analysis plays a crucial role in various fields, including signal processing and feature extraction. In this article, we propose an alternative and innovative method for time–frequency analysis using a biologically inspired …
View article: Universal radiation dynamics by temporal transitions in optical waveguides
Universal radiation dynamics by temporal transitions in optical waveguides Open
When an excited electromagnetically open optical waveguide goes through a temporal transition of its material properties, it radiates to the ambient surroundings. In this letter, we explore this radiation and reveal, using asymptotic evalu…
View article: Inverse design of ultrawideband one-dimensional metamaterial photonic filters using Riccati equation constrained gradient descent
Inverse design of ultrawideband one-dimensional metamaterial photonic filters using Riccati equation constrained gradient descent Open
One-dimensional photonic wave devices exhibit a pivotal role in wave engineering. Despite their relative simplicity, designing 1D wave devices that implement complex functionalities over a broad frequency range is challenging and requires …
View article: Space-time modulated loaded-wire metagratings for magnetless nonreciprocity and near-complete frequency conversion
Space-time modulated loaded-wire metagratings for magnetless nonreciprocity and near-complete frequency conversion Open
In recent years, significant progress has been made in the development of magnet-less nonreciprocity using space-time modulation, both in electromagnetics and acoustics. This approach has so far resulted in a plethora of non-reciprocal dev…
View article: Time-Varying Artificial Photonic Metastructures: introduction to the special issue
Time-Varying Artificial Photonic Metastructures: introduction to the special issue Open
Time-varying metamaterials are currently at the forefront of research, offering immense possibilities for intriguing wave manipulation. In this Feature Issue, we provide a collection of the most recent results on time-varying artificial ph…
View article: Localized source above a time-modulated dielectric half-space: Green's function theory
Localized source above a time-modulated dielectric half-space: Green's function theory Open
In this paper, we explore the two-dimensional Green's function problem above an instantaneous time-modulated dielectric half-space. In particular, we focus on studying the excitation dynamic with modulation that is carried out near the cri…
View article: Green's function theory of spatiotemporally modulated loaded wire surface
Green's function theory of spatiotemporally modulated loaded wire surface Open
In this paper we explore the two-dimensional Green's function problem above a spatiotemporally modulated loaded wire media. We suggest a spatiotemporal spectral representation to the space-time domain Green's function. Then, we evaluate th…
View article: Time-Frequency Analysis for Feature Extraction Using Spiking Neural Network
Time-Frequency Analysis for Feature Extraction Using Spiking Neural Network Open
Time-frequency analysis plays a crucial role in various fields, including signal processing and feature extraction. In this article, we propose an alternative and innovative method for time-frequency analysis using a biologically inspired …
View article: Time-Frequency Analysis for Feature Extraction Using Spiking Neural Network
Time-Frequency Analysis for Feature Extraction Using Spiking Neural Network Open
Time-frequency analysis plays a crucial role in various fields, including signal processing and feature extraction. In this article, we propose an alternative and innovative method for time-frequency analysis using a biologically inspired …
View article: Optimal Design of Dallenbach Absorbers Under Broadband Broad-Angle Illumination
Optimal Design of Dallenbach Absorbers Under Broadband Broad-Angle Illumination Open
The classical scenario where a \emph{single plane-wave} field impinge a Dallenbach absorber is well studied both theoretically and experimentally. However, occasionally a \emph{spectrum of plane-waves} impinges the absorber. Such a scenari…
View article: Filter inverse design by inhomogeneous space and time profiles
Filter inverse design by inhomogeneous space and time profiles Open
View article: Absorption beyond Rozanov bound by LTI surfaces
Absorption beyond Rozanov bound by LTI surfaces Open
View article: Temporal switching for pulsed wave applications
Temporal switching for pulsed wave applications Open
View article: Rayleigh Anomaly Induced Phase Gradients in Finite Nanoparticle Chains
Rayleigh Anomaly Induced Phase Gradients in Finite Nanoparticle Chains Open
We report on the theoretical study of anomalous phase gradients induced by Rayleigh anomalies in finite nanoparticle chains. These phase gradients, defined with respect to the phase of the applied plane wave, cause a deviation of the diffr…
View article: On the Use of the Padé–Fourier Approximation in Fast Evaluation of the Green’s Function of Layered Media
On the Use of the Padé–Fourier Approximation in Fast Evaluation of the Green’s Function of Layered Media Open
Efficient Green's function evaluation in layered media is a holy-grail of\nwave theory in general and for electromagnetics in particular. While there is a\nvery large amount of knowledge in this context with vast literature, there are\nyet…
View article: Parasitic Element Time-Modulation for Enhanced Effective Inter-Antenna Coupling: Utilization for Improved Gain-Bandwidth
Parasitic Element Time-Modulation for Enhanced Effective Inter-Antenna Coupling: Utilization for Improved Gain-Bandwidth Open
Time variation has been recently introduced as an additional degree of freedom for wave engineering, that enables going beyond the performances that are expected by linear time-invariant (LTI) systems. In this paper, we introduce the conce…
View article: Sum Rule Bounds Beyond Rozanov Criterion in Linear and Time-Invariant Thin Absorbers
Sum Rule Bounds Beyond Rozanov Criterion in Linear and Time-Invariant Thin Absorbers Open
Dallenbach layer is composed of an absorbing magnetic-dielectric layer attached to a perfect electric conductor (PEC) sheet. Under linearity and time invariance (LTI) assumptions Rozanov has established analytically a sum-rule trade-off be…
View article: Optimization-free Approach for Analog Filter Design through Spatial and Temporal Soft Switching of the Dielectric Constant
Optimization-free Approach for Analog Filter Design through Spatial and Temporal Soft Switching of the Dielectric Constant Open
The inverse-scattering problem of an inhomogeneous material has been of interest for many years, and was generally addressed with various optimization techniques. In this paper, we suggest an optimization-free method for solving the invers…
View article: One-Way Acoustic Guiding under transverse mean flow
One-Way Acoustic Guiding under transverse mean flow Open
In a moving acoustic medium, sound waves travel differently with and against the fluid flow. This well-established acoustic effect is backed by the intuition that the fluid velocity bias imparts momentum on the propagating acoustic waves, …
View article: On the use of the Padé-Fourier approximation in fast evaluation of the Green's function of layered media
On the use of the Padé-Fourier approximation in fast evaluation of the Green's function of layered media Open
Efficient Green's function evaluation in layered media is a holy-grail of wave theory in general and for electromagnetics in particular. While there is a very large amount of knowledge in this context with vast literature, there are yet ch…
View article: Wave Analysis and Homogenization of a Spatiotemporally Modulated Wire Medium
Wave Analysis and Homogenization of a Spatiotemporally Modulated Wire Medium Open
In this paper we develop homogenization theory for spatiotemporally modulated wire medium. We first solve for the modal waves that are supported by this composite medium, we show peculiar properties such as extraordinary waves that propaga…
View article: Absorption and scattering by a temporally switched lossy layer: Going beyond the Rozanov bound
Absorption and scattering by a temporally switched lossy layer: Going beyond the Rozanov bound Open
In this paper we study the electromagnetic scattering, absorption, and performance bounds for short time modulated pulses that impinge on a time-varying lossy layer that is sandwiched between vacuum and a perfect electric conductor. The el…
View article: Transformation and Phase Retrieval of Electromagnetic Fields between a Plane and an Arbitrary Surface Using Machine Learning
Transformation and Phase Retrieval of Electromagnetic Fields between a Plane and an Arbitrary Surface Using Machine Learning Open
The ability to tailor a specific electromagnetic field pattern along an arbitrary selected surface is interesting and of substantial importance, given its numerous immediate applications. It belongs to a class of inverse source problems, a…
View article: Possibility for inhibited spontaneous emission in electromagnetically open parity–time-symmetric guiding structures
Possibility for inhibited spontaneous emission in electromagnetically open parity–time-symmetric guiding structures Open
Significance Energy conservation implies that in lossless systems with prohibited radiation, spontaneous emission (the process in which an excited atom returns to its ground state while emitting a photon) is inhibited. However, since radia…
View article: Soft Temporal Switching of Transmission Line Parameters: Wave-Field, Energy Balance, and Applications
Soft Temporal Switching of Transmission Line Parameters: Wave-Field, Energy Balance, and Applications Open
Time-varying guiding structures introduce an additional degree of freedom,\nbesides spatial-variation, that enables better control over the guided wave in\na device. Periodically time-modulated structures which are usually considered\nenab…