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We suggest and demonstrate experimentally AlGaAs nanoantennas for efficient second-harmonic generation (SHG). We show that the SHG directionality and efficiency are defined by either electric or magnetic multipoles and controlled by incident polarization and design.
We suggest and realize experimentally dielectric metasurfaces with high transmission efficiency for quantum multi-photon tomography, allowing for full reconstruction of pure or mixed quantum polarization states across a broad bandwidth.
We analyze the contributions of surface and bulk effects to second-harmonic generation from crosses made of centrosymmetric dielectric and metallic materials and demonstrate that bulk and surface effects in dielectric structures can be comparable.
We developed an all-dielectric integrated source of ultrafast optical pulses by exploiting the mutual interaction and synchronization of near-field nanolasers emitting at the anapole frequency.
We demonstrate experimentally bright light emission from monolayer WSe2 coupled to Si doubly-resonant grating-waveguide structure. Our scheme allows for strong photoluminescence enhancement with polarization-spatial multiplexing and lifetime reduction, offering potential for ultrafast modulation.
We demonstrate experimentally sum-frequency generation in AlGaAs nano-resonators, establishing a quantum-classical correspondence with spontaneous parametric down-conversion. We predict that AlGaAs nano-resonators can be utilized as high-rate sources of photon pairs with non-classical correlations.
Recently we have shown that a nanofiber excited by a localized electric source can have enhanced electric and magnetic response depending of the relative orientation of the source and the fiber [1]. We have demonstrated that the dielectric nanofiber can suppress the electric response and enhance the magnetic response of the coupled system when excited with an electric dipole oriented along the circumference...
Similar to their plasmonic counterparts, dielectric nanoantennas have the ability to manipulate the emission properties of nanoscale emitters placed in their vicinity. Most importantly, they can increase the radiative decay rate of emitters by coupling to Mie-type resonances and/or shape the emission into directional patterns [1]. While considerable theoretical work has been dedicated to the study...
All-dielectric and semiconductor nonlinear nanophotonics is an emerging field enabling efficient optical interactions between magnetic and electric resonances at sub-wavelength scales, thereby achieving high directionality and high figures of merit due to very low losses [1, 2]. It was shown that AlGaAs nanodisks with quadratic nonlinear susceptibility can provide second harmonic generation (SHG)...
Measurements of quantum states of photons are conventionally performed with series of optical elements in bulk setups [1] or optical chips incorporating multiple tunable beam splitters. Here, we suggest and develop experimentally, for the first time to our knowledge, a new concept of quantum-polarization measurements with a single all-dielectric resonant metasurface [2]. The operating principle is...
Transition-metal-dichalcogenides (TMDs), which exhibit an indirect electronic band gap as bulk crystals, can become direct semiconductors in the monolayer phase [1]. Such monolayer TMDs show unique optical properties arising from the strong two-dimensional confinement of excitons as well as from the reduction in crystal symmetry. However, the strong mismatch in length scale between the sub-nanometer...
Control of light by an external magnetic field is one of the important methods for modulation of its intensity and polarization. Magneto-optical effects at the nanoscale are usually observed in nanostructured hybrid materials or magnetoplasmonic crystals. In this work, we combine the advantages of all-dielectric resonant nanostructures and magnetic materials for creating compact active magneto-optical...
One of the main challenges in photonics is the integration of ultrafast coherent sources in silicon compatible platforms at the nanoscale [1]. Generally, the emission of ultra-short pulses is achieved by synchronizing the cavity modes of the system via external active components, such as, e.g., Q-switch or saturable absorbers. Consequently, the required optical setups are complex and difficult to...
We study multiband metamaterials with several spectral band gaps associated with local Mie resonances, for the example of a square lattice of dielectric rods with dielectric permittivity ∊ = 70. We find that the band diagram possesses three Mieresonance gaps, all corresponding to negative effective magnetic permeability. By analysing the wave-propagation patterns, we demonstrate that this periodic...
We show how the spaser technology in the presence of a realistic source of quantum noise can be employed as a building block for designing new integrated sources for quantum simulators at the nanoscale.
We demonstrate an ultra-compact polarization demultiplexer based on a plasmonic nanoantenna enabling polarization-selective directional light coupling into a silicon waveguide. Our antenna can spatially separate polarization-encoded optical signals for ultra-fast optical communication applications.
We demonstrate polarization-insensitive holographic Huygens' metasurfaces based on silicon resonant meta-atoms capable of complex wavefront control at telecommunication wavelengths. We achieve over 82% transmittance efficiencies, with further optimization suggesting the efficiency exceeding 90%.
We characterize the ultrafast nonlinear optical properties of subwavelength silicon nanoparticles with magnetic dipolar response by means of the third-harmonic spectroscopy and pump-probe measurements.
We study the third-harmonic generation from silicon nanodisk quadrumers and demonstrate the substantial enhancement of the harmonic signal near the magnetic Fano resonance, due to an interplay of the individual and collective optically-induced magnetic response.
By employing ab-initio simulations of Maxwell-Bloch equations with a source of quantum noise, we study a new laser concept based on photonic dark-matter nanostructures that emit only in the near-field, with no far-field radiation pattern.
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