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We show for the first time that, contrary to common expectations, transition to superconductivity affects plasmonic behaviour of niobium at optical frequencies. This result is unexpected as photon energy is orders of magnitude higher than the binding energy of the Cooper pairs, the superconducting charge carriers.
We present a superconducting metamaterial with ultra-strong nonlinear response in the sub-terahertz range. A change in transmission of more than 10% has been achieved by ramping up the radiation intensity from 100µW/cm2 to just 800µW/cm2.
We demonstrate the first superconducting metamaterial that can exhibit a profound toroidal dipolar resonance. Quantum behaviour of the superconductor and toroidal excitation of the metamaterial are both necessary prerequisites for observing the time-dependent Aharonov-Bohm effect.
A long chase for the elusive dynamic toroidal moments has been recently concluded by detecting a spectral signature of the toroidal dipolar resonance in the response of a specially designed electromagnetic metamaterial [1]. This observation brings up a new interest to the prediction made by Afanasiev and Stepanovsky in 1994 that a combination of oscillating toroidal and conventional electric dipoles...
The new type of metamaterial exploits magnetic flux quantization as a source of its nonlinear response but does not require Josephson junctions. We fabricated metamaterial from a high-Tc superconductor and report its electromagnetic characterization.
We present the first demonstration of electro-optical modulator of sub-terahertz radiation where intensity and phase modulation is achieved by running current through a superconducting network of niobium meta-molecules supporting a high-Q resonance.
Toroidal moments are fundamental electromagnetic excitations that cannot be represented in terms of the standard multipole expansion [1]. They were first considered by Zel'dovich back in 1957 [2], but only recently have become the subject of growing interest owing to their peculiar electromagnetic properties. Electromagnetic interactions with toroidal currents were predicted to disobey such widely...
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