We study the low-energy conductivity dynamics after femtosecond perturbation of the stripe-ordered phase in a strongly-correlated nickelate. The experiments reveal ultrafast suppression and recovery of electron-phonon coupling that tracks the atomic-scale localization of correlated charges.
We describe a new technique for preparing and detecting spatial spin-correlations and multipartite entanglement in a quantum lattice gas based on entropic cooling via quantum non-demolition (QND) measurement and feedback.
We theoretically model the nonlinear dynamics of plasmonic waves in gold nanowires. We find that the thermo-modulational nonlinearity of gold leads to a strong spectral redshift of input pulses in a few microns of propagation.
It has recently been demonstrated that practical quantum cryptographic schemes are vulnerable to hacking attacks. We discuss the sources of this problem and present a novel generic approach to resolve it.
Photoluminescence as a function of the time delay between two ultrafast laser pulses measures the nonlinear emission dynamics of quantum dots coupled to photonic crystal cavities and distinguishes between exciton and biexciton emission.
The SHG in nonelectrically poled NLO polymers was investigated at Surface Plasmon resonance. The SHG conversion efficiency in the polymer-coated Ag films was more than 10 times as high as that in the non-coated ones.
Here we report efficient transverse sum-frequency generation in single semiconductor nanowires with low-power operation, which may serve as broadband tunable coherent light source for potential application in physics, chemistry, materials science and biology.
We have studied transmission degradation for sub-wavelength diameter Tapered Optical Fibers in Rubidium vapor. A heating strategy is shown to reduce degradation, thereby enhancing the ability to perform ultra-low-power nonlinear optics experiments.
We demonstrate a pump-probe phase-contrast method that reconstructs the spatio-temporal profile of plasma structures at density as low as 1016 cm−3. The method is compatible with very thin, very long, even turbulent media.
We study, both theoretically and experimentally, emission of correlated photon-pairs by spontaneous four-wave-mixing in silicon integrated resonators. We show that the number of generated pairs in the quantum experiment is predicted by a classical experiment.
We report on the first demonstration of the locking of a 28000 finesse cavity in picosecond regime. Besides, we have unambiguously measured the CEP drift of 2 ps pulses and characterized its effect on cavity locking.
We report on the generation of coherent N2+ emissions in a plasma string driven by two-color laser fields and measure their temporal structures. It is confirmed that the coherent emissions originate from seed-injected amplification.
We experimentally characterize a spontaneous parametric down-conversion source, based on a Beta-Barium-Borate crystal capable of emitting photons with positive or no spectral correlations. Our system employs a carefully designed detection method exploiting two InGaAs detectors.
We experimentally demonstrate a 10 times enhancement to the coincidence-to-accidental ratio of a correlated photon-pair source from a chalcogenide Ge11.5As24Se64.5 nanowire. This improvement is enabled by the low-Raman window of the device.
Simultaneous control of exciton qubits in two distinguishable InAs semiconductor quantum dots with emission wavelengths near 1.3 microns is demonstrated through the development and application of general femtosecond pulse shaping protocols.
Using ultrafast pump-probe spectroscopy, we investigate the exciton-exciton interaction in PbS quantum dot, and show that the biexciton binding energy is strongly altered by the extra single-exciton generated by the carrier multiplication process.
Two-dimensional coherent spectroscopy on a series of quantum dot samples with different morphology reveals that biexciton binding is independent of the details of confinement in InAs dots, in contrast to the behavior in GaAs dots.
We experimentally demonstrate a thermal emitter comprising sapphire and a vanadium dioxide thin film, which exhibits large negative differential emittance: over a temperature range of > 10 °C, the thermal emittance decreases by over 10%.
Giant (1%) picosecond strain pulses are generated in a fs-laser-irradiated cobalt transducer sandwiched between a gold layer and sapphire substrate. Ultrafast plasmonic interferometry reveals nonlinear acoustic propagation effects in the (111) gold film.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.