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We study superposition states of a trapped ion spin during photon scattering. We observe the emergence of a spin-measurement basis. Using ion-photon entanglement we are able to reverse the effect of photon scattering decoherence.
We theoretically investigate the role of self-focusing in high harmonic generation in high pressure waveguides. Self-focusing can stabilize phase matching at higher pressures than predicted for full phase matching, further enhancing the flux.
We report distinct dynamics of magnetic, electronic anisotropy and charge excitations in parent and weakly Co-doped BaFe2As2, which identify the manifestation of the Ising nematic symmetry and, its contribution to magneto-structural phase transition.
In an infinite periodic PhC slab, due to symmetry considerations, Fano resonances at k=0 completely decouple from the external world and their radiative quality factors become infinite despite lying above the light line. Here, we experimentally demonstrate the existence of such resonances at k∼0.
We report the observation of the magnetic dipole transition triggered with magnetic component of terahertz electromagnetic pulse in an antiferromagnetic YFeO3 crystal, which is manifested by a sharp absorption at the frequency of the quasiferromagnetic mode of the crystal. The rotating coherent macroscopic magnetization radiates circularly polarized emission at the frequency of the quasiferromagnetic...
We present the first ultrafast mid-infrared study of charge and spin-ordered nickelates. A multi-component dynamics is observed, evidencing the femtosecond decay and formation of the low-energy pseudogap in the optical conductivity.
A new optical near-field force between plasmonic metamaterials and dielectric/metallic surfaces is identified. It can exceed Casimir, radiation and gravitational forces to provide an optically-controlled adhesion mechanism mimicking the gecko toe.
We perform terahertz(THz)-pump-THz-probe spectroscopy to study ultrafast dynamics of BCS superconductor NbN. Resonant photo-injection of high density quasiparticles realized by the intense THz pump pulses results in a nonequilibrium BCS state.
The search for materials that show a phase transition triggered by weak external stimulation of light is an important and attractive target for photonic and materials science today. My talk reviews experimental evidence indicating that photo-injected local excitation can really trigger an electron-lattice coupled cooperative phenomenon named as photo-induced phase transition (PIPT: Photo-domino effect)...
Using a common-path interferometer combined with a spatial modulation technique, we simultaneously measure the absolute absorption and scattering cross-sections of individual metal nano-objects such as split-ring resonators or straight antennas.
We will discuss the use of dense periodic nanogap arrays for plasmonic sensing applications. A high-throughput fabrication process will be presented, that yields nanogap arrays with periodicities above 150 nm, and with accurately controlled gap widths of ±1.5 nm over mm2 large areas.
We show that high-intensity Airy pulses propagating in Kerr-type nonlinear media can preserve their self-accelerating features under appropriate conditions. By engineering the input pulses, controllable spectral shifting and reshaping are achieved.
Many-body interactions in a doped CdTe/CdMgTe quantum well are investigated using optical 2D Fourier-transform spectroscopy. The nature of coherent exciton-trion correlations is examined by analyzing lineshapes in the 2D spectra.
We demonstrate that meta-materials with extreme anisotropy allow for diffraction-free, deep sub-wavelength beam propagation and manipulation, as well as deep sub-wavelength imaging. We show a metamaterial design using existing materials.
Carrier dynamics in graphene at low energies are studied using two-dimensional THz spectroscopy. Pump-probe signals much faster than the acoustic phonon energy are observed due to a combination of intra- and interband absorption.
Sub-picosecond terahertz pulses are used to refresh or switch off the macroscopic intersubband polarization of a quantum well at low temperature. This coherent switching is directly observed in the time-domain and agrees with model calculations.
We investigate the interaction of strong single-cycle THz pulses with a coherent excitonic population, observing the transition from Rabi flopping of the 1s-2p transition to multi THz-photon ionization with increasing field strength.
We report on the utilization of optical sub-wavelength quasi Fabry-Perot cavity coupled with the Raman microscopy to study the interaction between the localized surface plasmon resonance of gold nanoparticles and the surface plasmon resonance of a gold film. We show an enhancement of the Fabry-Perot oscillations when the distance between nanoparticle and gold film decrease.
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