Viktar Asadchy
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View article: Non-Foster Photonic Time Crystals
Non-Foster Photonic Time Crystals Open
Photonic time crystals (PhTCs) are spatially uniform media whose material parameters vary periodically in time, opening momentum bandgaps within which the fields of electromagnetic modes can grow exponentially in time. To date, PhTCs have …
View article: Stacked Time-Varying Metasurfaces
Stacked Time-Varying Metasurfaces Open
Spatiotemporal metasurfaces offer unique opportunities for wave manipulation, however, their practical realization is often constrained by the requirement for in-plane spatial modulation, which necessitates a large number of time-varying e…
View article: Optimized Varactor-Tuned RIS Design for Wide-Angle Perfect Anomalous Reflection
Optimized Varactor-Tuned RIS Design for Wide-Angle Perfect Anomalous Reflection Open
View article: Perfect Reconfigurable Intelligent Surfaces with Sensing Functionality
Perfect Reconfigurable Intelligent Surfaces with Sensing Functionality Open
View article: Synthesis of Passively Loaded Reflectarrays for Perfect Anomalous Deflection
Synthesis of Passively Loaded Reflectarrays for Perfect Anomalous Deflection Open
View article: All-Angle Scanning Leaky-Wave Antennas and Surface-Wave Routing by Reconfigurable Metasurfaces
All-Angle Scanning Leaky-Wave Antennas and Surface-Wave Routing by Reconfigurable Metasurfaces Open
In this work, we show that propagating waves can be fully converted into surface waves and back using geometrically periodic arrays of simple electrically small metal elements loaded by adjustable reactive loads. The proposed approach allo…
View article: Realization of the Tellegen Effect in Resonant Optical Metasurfaces
Realization of the Tellegen Effect in Resonant Optical Metasurfaces Open
The nonreciprocal magnetoelectric effect in isotropic Tellegen materials enables exotic phenomena such as axion-modified electrodynamics and fosters the development of magnet-free nonreciprocal media. Although predicted over 75 years ago a…
View article: Inverse‐Designed Dispersive Time‐Varying Nanostructures
Inverse‐Designed Dispersive Time‐Varying Nanostructures Open
Time‐varying nanostructures allow to control the spatial and temporal properties of light. The temporal modulation of the nanostructures constitutes an additional degree of freedom to control their scattering properties on demand and in a …
View article: Simultaneous Angle-of-Arrival Sensing and Anomalous Deflection with Aperiodically Loaded Patch Arrays
Simultaneous Angle-of-Arrival Sensing and Anomalous Deflection with Aperiodically Loaded Patch Arrays Open
We propose and numerically demonstrate a reconfigurable patch antenna array that enables simultaneous incident wave sensing and anomalous reflection without prior knowledge of the propagation environment. We acquire anomalous reflection by…
View article: Simultaneous Perfect Anomalous Reflection and Angle of Arrival Sensing in Reconfigurable Intelligent Surfaces
Simultaneous Perfect Anomalous Reflection and Angle of Arrival Sensing in Reconfigurable Intelligent Surfaces Open
This work introduces reconfigurable Intelligent surfaces (RISs) designed to simultaneously reflect single or multiple incident waves toward one or more receivers and sense their angles of arrival (AoA). Anomalous reflection with strongly s…
View article: Multifunctional passive metacrystals for enhancing wireless communications
Multifunctional passive metacrystals for enhancing wireless communications Open
Intelligent surfaces have emerged as a promising solution to enhance coverage and mitigate signal fading in future wireless communication systems, thereby improving bandwidth and data rates. Passive intelligent surfaces, in particular, dem…
View article: Expanding momentum bandgaps in photonic time crystals through resonances
Expanding momentum bandgaps in photonic time crystals through resonances Open
View article: Theory and applications of photonic time crystals: a tutorial
Theory and applications of photonic time crystals: a tutorial Open
This tutorial offers a comprehensive overview of photonic time crystals: artificial materials whose electromagnetic properties are periodically modulated in time at scales comparable to the oscillation period of light while remaining spati…
View article: Inverse-designed dispersive time-varying nanostructures
Inverse-designed dispersive time-varying nanostructures Open
Time-varying nanostructures allow us to control the spatial and temporal properties of light. The temporal modulation of the nanostructures constitutes an additional degree of freedom to control their scattering properties on demand and in…
View article: Broadband transparent Huygens' spaceplates
Broadband transparent Huygens' spaceplates Open
Spaceplates have emerged in the context of nonlocal metasurfaces, enabling the compression of optical systems by minimizing the required empty space between their components. In this work, we design and analyze spaceplates that support res…
View article: Nanoscale optical nonreciprocity with nonlinear metasurfaces
Nanoscale optical nonreciprocity with nonlinear metasurfaces Open
Optical nonreciprocity is manifested as a difference in the transmission of light for the opposite directions of excitation. Nonreciprocal optics is traditionally realized with relatively bulky components such as optical isolators based on…
View article: Photonic time crystals: Theory and applications
Photonic time crystals: Theory and applications Open
This tutorial offers a comprehensive overview of photonic time crystals - artificial materials whose electromagnetic properties are periodically modulated in time at scales comparable to the oscillation period of light while remaining spat…
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: Temporal interfaces in complex electromagnetic materials: an overview [Invited]
Temporal interfaces in complex electromagnetic materials: an overview [Invited] Open
Time-varying metamaterials are currently at the forefront of research, offering immense possibilities for intriguing wave manipulations. Temporal modulations of metamaterials have paved the way for unconventional realizations of magnetless…
View article: Optical Tellegen metamaterial with spontaneous magnetization
Optical Tellegen metamaterial with spontaneous magnetization Open
The nonreciprocal magnetoelectric effect, also known as the Tellegen effect, promises a number of groundbreaking phenomena connected to fundamental (e.g., electrodynamics of axion and relativistic matter) and applied physics (e.g., magnetl…
View article: Simultaneous High-Efficiency Anomalous Reflection and Angle of Arrival Sensing in Reconfigurable Intelligent Surfaces
Simultaneous High-Efficiency Anomalous Reflection and Angle of Arrival Sensing in Reconfigurable Intelligent Surfaces Open
In this work, we introduce reconfigurable intelligent surfaces designed to simultaneously perform reflection of single or multiple incident waves toward the receiver or receivers and sensing the angles of arrival. We achieve anomalous refl…
View article: Mid-range wireless power transfer: anapoles or magnetic dipoles?
Mid-range wireless power transfer: anapoles or magnetic dipoles? Open
For short-range wireless power transfer (WPT) one recently suggested so-called anapole antennas that practically do not create fields in the far zone, eliminating radiation loss. Enhancements of power transfer efficiency (PTE) compared to …
View article: Roadmap on electromagnetic metamaterials and metasurfaces
Roadmap on electromagnetic metamaterials and metasurfaces Open
The flourishing area of electromagnetic (EM) metamaterials and metasurfaces has attracted significant
\ninterests for several decades. Early work can be traced back to 1968 when Victor G. Veselago firstly
\npresented the theory of negative…
View article: Extreme Nonreciprocity in Metasurfaces Based on Bound States in the Continuum (Advanced Optical Materials 1/2024)
Extreme Nonreciprocity in Metasurfaces Based on Bound States in the Continuum (Advanced Optical Materials 1/2024) Open
Extreme Nonreciprocity in Metasurfaces Based on Bound States in the Continuum In article 2301455, Luis Manuel Máñez-Espina and co-workers demonstrate theoretically and numerically the use of bound states in the continuum to enhance and con…
View article: Enhancing the Size of Momentum Bandgaps Using Resonant Spatiotemporal Metasurfaces
Enhancing the Size of Momentum Bandgaps Using Resonant Spatiotemporal Metasurfaces Open
Photonic time crystals often require high modulation depths of material properties to exhibit large momentum bandgaps. We show that such a requirement can be dramatically relaxed by exploiting the structural resonances of a spatiotemporal …
View article: Extreme Nonreciprocity in Metasurfaces Based on Bound States in the Continuum
Extreme Nonreciprocity in Metasurfaces Based on Bound States in the Continuum Open
Nonreciprocal devices, including optical isolators, phase shifters, and amplifiers, are pivotal for advanced optical systems. However, exploiting natural materials is challenging due to their weak magneto‐optical (MO) effects, requiring su…
View article: Expanding momentum bandgaps in photonic time crystals through resonances
Expanding momentum bandgaps in photonic time crystals through resonances Open
The realization of photonic time crystals is a major opportunity but also comes with significant challenges. The most pressing one, potentially, is the requirement for a substantial modulation strength in the material properties to create …
View article: Temporal Parity-Time-Symmetric Metasurfaces
Temporal Parity-Time-Symmetric Metasurfaces Open
Publisher Copyright: © 2023 IEEE.
View article: Nonreciprocal Huygens’ Metasurfaces Based on Bound States in the Continuum
Nonreciprocal Huygens’ Metasurfaces Based on Bound States in the Continuum Open
Publisher Copyright: © 2023 IEEE.
View article: Unleashing Infinitely Wide Momentum Bandgaps in Photonic Time Crystals
Unleashing Infinitely Wide Momentum Bandgaps in Photonic Time Crystals Open
Publisher Copyright: © 2023 IEEE.