| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Tretyakov, Sergei
Aalto University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2023Loss-gain compensated anti-Hermitian magnetodielectric medium to realize Tellegen nihility effectscitations
- 2022Dipole polarizability of time-varying particlescitations
- 2022Parametric Mie Resonances and Directional Amplification in Time-Modulated Scattererscitations
- 2021Perfect non-specular reflection through spatially dispersive boundary conditions
- 2020From Polarizability to Effective Permittivity of Time-Varying Materials
- 2018Stored and absorbed energy of fields in lossy chiral single-component metamaterialscitations
- 2018Systematic Design of Printable Metasurfaces: Validation Through Reverse-offset Printed Millimeter-wave Absorberscitations
- 2016Overcoming black body radiation limit in free spacecitations
- 2016Towards printed millimeter-wave components:Material characterizationcitations
- 2016Towards printed millimeter-wave componentscitations
- 2016Phase-change material-based nanoantennas with tunable radiation patternscitations
- 2016Towards printed millimeter-wave components: Material characterizationcitations
- 2014Multifunctional stretchable metasurface for the THz rangecitations
- 2013Polarization effects in stretchable metasurfaces for THz frequency rangecitations
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article
Dipole polarizability of time-varying particles
Abstract
Funding Information: This work was supported by the Academy of Finland under grant 330260. MSM wishes to acknowledge the support of Ulla Tuominen Foundation. Also, the authors thank V Asadchy and A Sihvola for their invaluable comments. In addition, MSM thanks X Wang for helping to prepare the figure of the paper. Publisher Copyright: © 2022 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft. ; Invariance under time translation (or stationarity) is probably one of the most important assumptions made when investigating electromagnetic phenomena. Breaking this assumption is expected to open up novel possibilities and result in exceeding conventional limitations. However, to explore the field of time-varying electromagnetic structures, we primarily need to contemplate the fundamental principles and concepts from a nonstationarity perspective. Here, we revisit one of those key concepts: the polarizability of a small particle, assuming that its properties vary in time. We describe the creation of induced dipole moment by external fields in a nonstationary, causal way, and introduce a complex-valued function, called temporal complex polarizability, for elucidating a nonstationary Hertzian dipole under time-harmonic illumination. This approach can be extended to any subwavelength particle exhibiting electric response. In addition, we also study the classical model of the polarizability of an oscillating electron using the equation of motion whose damping coefficient and natural frequency are changing in time. Next, we theoretically derive the effective permittivity corresponding to time-varying media (comprising free or bound electrons, or dipolar meta-atoms) and explicitly show the differences with the conventional macroscopic Drude-Lorentz model. This paper will hopefully pave the road towards better understanding of nonstationary scattering from small particles and homogenization of time-varying materials, metamaterials, and metasurfaces. ...