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Localized and propagating surface plasmon dynamics in Ag films are imaged by time-resolved photoemission electron microscopy with <10 fs time and d~40 nm spatial resolution. Movies of plasmon dephasing are recorded with 330 as/frame rate.
We have detected electromagnetically-induced transparency (EIT) in a cigar-shaped MOT. The asymmetric shape of probe absorption as a function of frequency is consistent with enhancement of optical depth due to wave guiding of the probe.
We report the first single-shot measurements of transverse and longitudinal structure of laser-generated wakefields. Real-time, non-averaged measurements of resonant wakes reveal detailed temporal and spatial features that depend on pulse energy and electron density.
Spin gratings lasting longer than the carrier lifetime are measured in lightly n-doped quantum wells. In a magnetic field, precession of the grating is observed, and diffusion rates are determined by varying the grating period.
Femtosecond pulses coupled to hollow-pyramid near-field probes allow achieving sufficient peak power to perform near-field nonlinear optics. We present second-harmonic generation images of nanostructured metal surfaces with spatial resolution better than 100 nm.
We report our progress towards the realization of a tunable and narrow-band source of correlated photons for coherent manipulation of cold atoms, using a combination of four-wave mixing and electromagnetically induced transparency.
Time-resolved mid-infrared pump-probe measurements in a quantum cascade laser operating above threshold reveal gain recovery dynamics to be two-fold: relaxation within a stage on a sub-picosecond scale and transport between stages on a picosecond scale.
We report the experimental observation of EIT in Cs2 in Lambda configuration. The width of EIT is smaller than widths of molecular transitions and has different dependence on temperature. Application to quantum storage is discussed.
We present a microscopic interpretation of recent differential transmission measurements of electron spin coherence in GaAs quantum wells. We show that certain unexpected features in the beat signal can reveal finer characteristics of excitonic correlations.
We demonstrate a ring-shaped Bessel-like photonic lattice akin to a photonic bandgap fiber with a low-index core. While the lattice is optically induced with self-defocusing nonlinearity, bandgap guidance of a probe beam is clearly observed.
As one of the first observations of intra-molecular dynamics using high-order harmonic generation, we impulsively excite vibrations in SF6 and observe oscillations in the intensity of high-order harmonic emission from these molecules.
Strong in-plane confinement of acoustic phonons in air-glass PCFs with sub-wavelength-scale cores is shown to result in an acoustic mode cut-off frequency, which acts like a Raman resonance. Spontaneous and photoacoustic measurements illustrate the effect.
We investigate wavelength conversion by cross-phase modulation in the presence of strong dispersion and two photon absorption in highly nonlinear singlemode As2Se3 fiber, achieving conversion over a span of 30 nm.
Two-dimensional multicolored arrays of quadratic spatial solitons and up-converted parametric amplifications are observed through cascaded non-collinear quadratic processes in quadratic media, which can be switched by phase-insensitive weak beam control with second harmonic seeding pulses.
Time-resolved mid-infrared-pump, optical-probe differential transmission spectroscopy directly reveals electron dynamics in n-doped quantum dots infrared detector structure. Capturing and intradot relaxation time were measured. Nanosecond-scale dynamics in the n=1 state was also observed.
Using a bi-frequency pumped Raman amplifier in a Rb vapor cell, we demonstrate experimentally the condition for achieving a null group index, necessary for fast-light enhanced rotation sensing in a passive cavity Sagnac gyroscope.
We report on the observation of electromagnetically induced transparency using the hyperfine levels of Er3+:Y2SiO5 crystal and on hole burning spectroscopy in order to identify the Lambda-like three-level system over the inhomogeneously broadened distribution.
We investigate slow light behavior of warm Rb vapor in static magnetic fields. We present data showing two-photon resonance shifts and slow behavior. These results demonstrate feasibility of the previously presented channelization architecture.
The Fuchs-Peres-Brandt (FPB) probe realizes the most powerful individual attack on BB84 quantum key distribution. A physical simulation of the FPB-probe attack using single-photon two-qubit quantum logic is described.
We studied excited states of excitons and biexcitons in CuCl quantum dots by infrared transient absorption measurement. We successfully obtained their absorption spectra clearly to discuss the specific excited states of the confined biexcitons.
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