The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
While the manipulation of wave polarization is commonplace in electromagnetism, the physical means to do so in homogeneous elastic media used to remain an open question. Here, we report the concept of micro-structured surfaces with inner resonance in the field of elastodynamics. Such a metasurface can tune the boundary conditions at specific frequencies and achieve the depolarization of mechanical...
This paper presents our observation of the abnormal Doppler effect inside a reconfigurable balanced transmission line, which has zero index at the balanced frequency. By applying a digital signal controller, a moving reflective interface is built inside this transmission line. The normal, inverse and zero Doppler effects are observed at different frequencies, which gives a completed picture of Doppler...
The designing of the two-dimensional extremely subwavelength epsilon-negative metamaterials is presented at radio frequencies. The operation of the proposed components originates from the resonance of a dual-layer metamaterial of inclusions excited by an alternating electric field. The real part of permittivity should be assuming negative values in the artificial materials from 11.1MHz to 14MHz. To...
We report recent research progress on the strong coupling between an ensemble of quantum emitters (QEs) or chiral molecules and plasmon in the nanoparticle cluster, including strong interaction between chiral molecules and orbital angular momentum of photon, multi-qubit entanglement for two-level QEs, resonant energy transfer and so on.
Based on exact numerical calculations and physical analyses, we demonstrate that there are two types of flat band in two-dimensional (2D) magnetic photonic crystals (PhCs). One has trivial topology with zero Chern number and the other has non-trivial topology with nonzero Chern number. Physical origins and topological properties of two types of flat band are studied comparatively.
It is shown that two-dimensional periodic magnetic systems with in-plane magnetization composed by a mixture of ferromagnetic materials have an effective diamagnetic behavior. Because of the formation of effective “surface magnetic charges” resulting from the magnetization contrast at the boundary between the two ferromagnetic materials, the demagnetizing field is parallel to the in-plane external...
A class of optical nanoantennas utilized as photoinduced magnetic nanoprobes is studied for enhancing magnetic near-field in a magnetic-dominant region with vanishing electric field. We examine the illumination of such magnetic nanoprobes that guarantees selective excitation of magnetic resonances, such as azimuthally electric polarized beams (APBs) which possess a strong longitudinal magnetic field...
The speed with which electromagnetic energy can be wirelessly transferred from a source to the user is a crucial parameter for performance of a large number of electronic and photonic devices. In this presentation we determine the constituent parameters of a medium which supports theoretically infinite energy concentration close to a medium sample surface; such a material combines properties of Perfectly...
The importance of inhomogeneous broadening due to the size dependence of plasmon resonances in few-nm metallic particle ensembles is investigated through different models describing the nonlocal optical response of plasmonic nanospheres. Modal shifts and plasmon line broadening are shown to become important within the first-order correction to classical electrodynamics provided by the hydrodynamic...
Infrared absorber concept is a vibrant research topic because of the importance of real world applications such as infrared detectors, thermal coolers and energy harvesters. In this paper, we propose and numerically analyze thin metamaterial structures designed to operate in Long Wave Infrared Region, one of the regions that atmosphere shows transparent behavior. It is demonstrated that one of the...
In this contribution, we present a non-conventional core-shell nanoparticle, named supersphere, for implementing optical devices whose performances cannot be easily achieved with conventional nanoparticles. Superspheres are solids with intermediate shape between a sphere and a cube, whose external boundaries are described by Lamè surface equation. Thanks to its particular shape, a core-shell supersphere...
In this work a classical frequency selective surface is proposed for sensing applications at the terahertz regime. We design and experimentally test a FSS operating near 0.8 THz based on a cross-dipole periodic structure laying on a thin polypropylene substrate. A good sensing capability is tested by depositing a dielectric layer on the FSS, reaching a sensitivity up to 20%. Finally, an application...
We have studied theoretically guiding structures based on the highly-dispersive polaritonic InSb semiconductor material, in the presence of an external magnetic field. The Voigt magnetooptic configuration has been imposed to enable nonreciprocity (and one-way propagation) bringing new interesting phenomena in connection with magnetoplasmons. For that purpose, we have developed an efficient two dimensional...
The Dicke subradiance and superradiance resulting from the interaction between surface plasmons of nanospheres and an ensemble of quantum emitters have been investigated by using a Green's function approach. Based on such an investigation, we propose a scheme for a deterministic multi-qubit quantum phase gate. The case of single sphere has been compared with nanosphere cluster which possesses hot...
Electromagnetic properties of a photonic crystal slab in the shape of a two dimensional periodic lattice of polydimethylsiloxane (PDMS) rods with square symmetry is investigated through the use of THz time domain spectroscopy. The fit of the transmission through a full wave simulation give insights on the guided mechanism responsible for the onset of a resonance at about ƒ0 = 1.57THz. The device can...
We propose to use arrays of resonant structures buried around sensitive locations as protection against surface seismic waves. The resonant structures consist of concrete tubes containing a steel mass suspended by soft bearings. We verify their design numerically and on a scaled experimental campaign. The arrays attenuate and redirect Rayleigh waves within the [1–10Hz] frequency range.
Graphene, as a 2D semi-metal, is able to support surface plasmon modes. These plasmons interact, scattering the electrons in graphene, by way of emission and absorption. For electrons in thermal equilibrium, the energy scale of the optical response can be tuned by setting the Fermi level via external gate voltage. However, for non-equilibrium cases, such as photo-excitation, plasmons can become amplified...
A parallel plate plasmonic waveguide is proposed in order to emulate the performance of a permittivity-near-zero metamaterial (ENZ) at optical wavelengths by working near the cut-off of the TE1 mode. It is shown that the ENZ region can be tuned by simply modifying the electrical width of the dielectric spacer of the plasmonic waveguide. Also, a graded index (GRIN) epsilon-near-zero lens working at...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.