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We experimentally demonstrate nanoscale thermal mapping of light induced heat in photonic and plasmonic devices using a thermocouple AFM tip. Numerical simulations results and nanoscale temperature measurements are presented and discussed.
We used velocity-map imaging to measure ultrafast electron dynamics in N2 initiated by attosecond pulses. A time-to-space mapping of autoionization channel is demonstrated. A sub-cycle oscillatory dynamics related to quantum interference is also observed.
We present a review on the use of molecular nanomotors to probe the near field of metal nanoparticles. Both the experimental and theoretical point of view will be presented and discussed.
We propose and experimentally realize a far-field imaging technique, polarization spectro-tomography, capable of detecting small resonant objects (quantum dots, plasmonic nanorods) on the surface of a plasmonic nanosphere. The technique is based on Fano interference.
Functional metamaterials provide useful properties for the design of electromagnetic devices. In this work we demonstrate that functions including high nonlinearity and amplification can be included in metamaterials to realize time reversal imaging.
We present first results of simultaneous attosecond streaking measurements of shake-up electrons and Auger electrons emitted from xenon. The spectral overlap of the electronic wavepackets allows for reliable reconstruction of the relative phases.
We present results on attosecond transient absorption in small molecules. Ultrafast relaxation dynamics in nitrogen can be temporally resolved by combining an isolated attosecond pulse and an intense synchronized carrier-envelope-phase stable infrared pulse. The lifetime of the different Fano resonances can be retrieved.
Knowing the mode structure of light aids in minimizing loss and decoherence of quantum information. We present and experimentally implement reconstruction of the mode distributions of classical and non-classical light using measured photon number distributions.
We present the new regime of high-order harmonics generation by multi-TW femtosecond lasers irradiating gas jet targets. We describe new results concerning the off-axis XUV harmonics emission, angular distribution and source size.
We demonstrate bright high harmonic generation driven by UV lasers with ultra-high conversion efficiency approaching 10−3 and ultra-narrow single-harmonic bandwidth of ∼0.2%. The enhanced flux results from improved phase-matching combined with stronger single-atom yield.
We demonstrate for the first time that fine varying of the density gradient of a plasma mirror along with laser spatial phase on target allows total control over the harmonic generation mechanisms and harmonic spatial properties. An analytical model is also proposed.
We report a highly-sensitive technique to obtain mid-infrared spectra with nanoscale spatial resolution via detecting a mechanical force exerted by vibrating molecules on an atomic force microscope tip. Sub-monolayer sensitivity is demonstrated.
Optimization of plasmonic disc on pillar (DOP) structures guided by FDTD simulations, their deterministic fabrication and characterization by both Raman microscopy and dark-field spectroscopy are discussed. SERS enhancement factors exceeding 109 are achieved using optimized DOP structures.
We demonstrate experimentally an optical event horizon in a waveguide structure akin to a hydrodynamic Laval nozzle. The event horizon which forms at the nozzle throat is suggested as a platform for analog gravity experiments.
We directly map plasmonic near-field intensities by resonantly enhanced infrared far-field spectroscopy. We position a nanoscopic molecular probe at different locations of plasmonic rod and gap-type antennas and measure the vibrational signal with FTIR spectroscopy.
Line emission of N2 and time-resolved electron density are measured in a several centimeter long plasma column. Peak density is 6∗1015 cm−3 and emission from the second positive system of N2 is observed.
We present the measurement of χ(3) nonlinearity of Green Fluorescent Protein. The nonlinear index is n2 = 10−19m2/W, opening the possibility of using genetically engineerable and naturally occuring proteins in cells as a source of four wave mixing experiments.
We report progress of the Beijing regional time and frequency network and a series of innovations used for it, including the fiber based multiple-access RF dissemation system, phase-locked free space RF dissemination system.
This paper demonstrates that the efficiency of InGaN-based light-emitting diodes with nano-post patterned sapphire substrates is superior to that with nano-hole patterned sapphire substrates under the same nano-scale feature owing to reduced quantum-confined stark effect.
We study the time- and spectrally-resolved exciton dynamics of a few-layer molybdenum disulfide using ultrafast optical pump-probe spectroscopy. We find that the carrier induced broadening significantly influence on the band-edge transmission spectra even with small carrier densities.
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