Single-exciton, biexciton, triexciton, and quadraexciton bands were resolved in the microphotoluminescence spectrum of a single $\mathrm{CdTe}/\mathrm{CdSe}$ core-shell colloidal quantum dot, revealing nearly blinking-free behavior. Multiexcitons generated by sequential filling electronic shells with increase continuous-wave excitation power, their probability was evaluated under steady-state conditions. A partial carriers' delocalization determined at interface, an exciton binding energy...

We investigate the propagation of short, intense laser pulses in arrays coupled silica waveguides, anomalous dispersion regime. The nonlinearity induces trapping pulse a single waveguide, over wide range input parameters. A sharp transition is observed for waveguide excitation, from strong diffraction at low powers to localization high powers.

We study the loss of magneto-optic contrast in nickel, response to excitation by a short laser pulse, as function density. Our measurements picosecond and subpicosecond regime show saturation at high densities. conclude that spin relaxation is incomplete on this time scale, explain its terms collapse Stoner gap due band filling effects.

We experimentally investigate the behavior of Fano-like plasmonic resonance lineshape in a simple system comprising subwavelength hole or particle illuminated by tightly focused Gaussian beam. observe that for small lateral displacement scatterer, k-space distribution wave exhibits strong spin-dependent azimuthal variation. attribute this phenomenon to sensitive light-plasmon coupling conditions arising due specific phase matching requirements. This effect is qualitatively described...

Abstract CdTe/CdSe core‐shell colloidal quantum dots (CQDs) were synthesized by a unique procedure permitting the growth of spherical structures with highest emission efficiency (∼90%). The CQDs photoluminescence (PL) intensity shows only minor fluctuations (<10%) in time, revealing blinking suppression CQDs, while PL single CQD occurrence longer lived (ns) multiexcitons, important for applications also gain devices. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

We have developed a femtosecond magneto-optical imaging system that allows measurements of permanent magnetic effects are initiated by single excitation pulse. The combines subpicosecond temporal resolution and high spatial resolution. demonstrate the in an experiment studies laser-induced magnetization reversal ferromagnetic thin films.

Research regarding topological Dirac and Weyl semimetals contributes to our understanding not only of the field solid-state physics, but also high-energy physics as resembles massless fermions. In condensed matter nodes are detached in momentum space may be realized emergent quasiparticles with a distinct chirality, left-handed or right-handed. These states lead phenomena like chiral anomaly anomalous Hall effect (AHE). Furthermore, combination quantum effects magnetic is very intriguing....

Graphene oxide (GO) raised substantial interest in the last two decades thanks to its unique properties beyond those of pristine graphene, including electronic energy band-gap, hydrophilic behavior and numerous anchoring sites required for functionalization. In addition, GO was found be a cheap mass-production source formation graphene. However, presence clusters containing oxygen functional groups (called debris) on surface hinders integration devices. Here, we present simple method aimed...

A simplified near-field scanning optical microscope is employed to image the propagation of short laser pulses in planar silica waveguides, anomalous dispersion regime, under varying conditions input beam power and width. Our results show a complex evolution transverse intensity profiles when there pronounced difference between diffraction lengths. Numerical simulations confirm that these spatial dynamics are intimately related temporal spectral pulse.

We show that during the spatiotemporal compression in a periodic Kerr waveguide array, stimulated Raman scattering can effectively balance effects of self-phase modulation, diffraction, and group-velocity dispersion, eliminating collapse breakup over wide range input powers leading to stable propagation single site.

Abstract We examine the Kramers–Kronig relations between circular dichroism and optical rotation dispersion in k -space obtained from a chiral metasurface with reduced rotational symmetry. operate leakage-radiation microscopy system to probe near-field plasmonic modes measure polarization effects of grating. By using our we were able capture analyze at both air/gold gold/glass interfaces. The mapping chirality parameters allows us fully activity metasurface. experimentally find that...

A lot of electronic devices utilize linear Hall sensors to measure current and the magnetic field, as well perform switching latching operations. Smartphones, laptops, ereaders all work with very low (sub-milliampere) currents. To a function in low-power devices, however, must microampere regime. In this we demonstrate, for first time, ability standard detector linearly regime between 0 0.7 Tesla. do so, developed source RMS noise on order 10-100 pA/sqrt(Hz). An optimized circuit minimal...

Todays battlefield is using imaging systems everywhere, starting from simple observation and up to very sophisticate warning offensive systems. Cameras are integrated in almost all Regulation control of optical power cameras presently requires an electronic feedback or offline data processing, which introduces complex expensive We present a non-linear, solid-state passive dynamic sunlight filter (DSF) performing this process, yielding similar results - passively. When intensity increases,...

Many modern electronic devices utilize linear Hall sensors to measure current and the magnetic field, as well perform switching latching operations. Smartphones, laptops, e-readers all work with very low (sub-mA) currents. To a function in such low-power devices, however, sensor must be able {\mu}A regime. This paper demonstrates, for first time, ability of standard detector regime between 0 0.7 Tesla. A second important application this technology is measurement electron transport...

We show saturation of the sub-picosecond demagnetization in nickel at high excitation densities, conclude that spin relaxation is incomplete, and associate with collapse Stoner gap due to band filling effects.

In article number 2000505, Efrat Lifshitz, Dima Cheskis and co-workers present a simple method aimed to reduce the density of clusters containing oxygen functional groups (oxygen debris) weakly bonded graphene oxide (GO) surface. The scanning tunneling microscopy (STM) image untreated GO (left on cover) shows bright patterns superimposed onto atomically resolved structure. randomly dispersed spots are most probably related agglomeration groups. fast Fourier transform (FFT) (center image) STM...

The study of multiexcitons in colloidal quantum dots (CQDs) is a timely topic, as these have practical applications gain devices, photovoltaic cells and single photon light sources. However, excitons decay primarily via nonradiative Auger relaxation at time scale 10-100 ps, due to the enhancement many-body interactions inside with typical diameter 3-4 nm surrounded by low dielectric medium. Despite predicted limitations, present unambiguously showed an emission neutral biexciton (BX),...

Abstract not Available.

The rapid growing interest in the field of plasmonics comes from advance nanotechnologies involving nanophotonics applications. surface plasmon polaritons (SPP) exited by light on metallic nano grooves arrays (NGA) and nanowires (NWs), play a role an intermediary between photonics electronics. We report experimental demonstration polarization controlled SPP propagation, leading to tailored directional coupling periodic plasmonic NGAs NWs. emission Au NWs is modulated incident polarization....