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I will discuss recent progress on new near-field probe geometries, including the “campanile” geometry, which has been used in recent hyperspectral imaging experiments, providing nanoscale spectral information distinct from what is obtained with other methods.
We show how tailored few-cycle lightwaves with near relativistic intensity (∼1018W/cm2) can be used to control the attosecond electron dynamics of plasma mirrors and to produce beam manifolds of fully synchronized attosecond EUV light pulses.
We focus a short writing pulse burst into a photo-resist, polymerizing a voxel. The time-resolved transmission of a co-focused second laser probes the voxel formation dynamics. We measure time constants as small as 400 µs.
A polarization line-by-line pulse shaper is used in analytically measuring optical arbitrary waveforms (OAWs) of 100% duty cycle without reference, which is essential for high repetition rate OAWs.
We use ultrafast optical microscopy to investigate carrier dynamics in single flakes of atomically thin molybdenum disulfide. By tuning the probe wavelength through the bandgap, we reveal the influence of layer thickness on carrier dynamics.
A hand-held probe combining high-resolution reflectance confocal microscopy (RCM) and optical coherence tomography (OCT) within the same optical path was developed and preliminarily tested for assessing skin burns. The preliminary results show that these two optical technologies have complementary capabilities that can help the clinician to more rapidly identify the dermal-epidermal junction, determine...
Giant gain enhancement effect of surface plasmon polaritons (SPPs) on terahertz (THz) stimulated emission in optically pumped monolayer graphene has been experimentally studied. We observed the spatial distribution of the THz probe pulse intensities under linear polarization of optical pump and THz probe pulses. It was clearly observed that an intense THz probe pulse was detected only at the area...
We propose a novel scheme for a single-shot, fast (10s of nanoseconds), high fidelity (99.95%) quantum non-demolition (QND) readout of quantum dot (QD) electron spins based on their spin-dependent Coulomb exchange interaction with optically-excited quantum well (QW) microcavity exciton-polaritons.
Using near-infrared pump probe technique, we demonstrate ultrafast photoinduced absorption with a decay constant as short as 100 fs in a large single crystal of bismuth ferrite with high quality grown by floating zone method.
A Brillouin probing method is proposed to extract the distribution of signal power along phase-sensitive parametric amplifiers. Operation near the zero-dispersion-wavelength shows enhanced sensitivity to dispersion fluctuations, allowing effective extraction of the dispersion map.
An on-chip technique for all-optical ultrafast control of silicon photonic elements was demonstrated by controlling transmission of SOI multimode interference-devices. Localized absorption by free carriers generated by ultraviolet pump pulses was used for achieving control.
We present pump-probe measurements that reveal significant changes in the group delay dispersion of a femtosecond laser pulse being controlled by the relative delay between two pulses. We suggest applications for this time-domain shaping approach.
We demonstrate the first narrowband parametric interaction in a semiconductor (GaInP) photonic crystal waveguide. A pulsed pump, propagating in the normal dispersion regime yields a conversion efficiency of −10dB with a moderate peak pump power of 650mW.
We present integrated optomechanical transducers with exposed tips and demonstrate ultrahigh force sensitivity and large bandwidth. The transducer is implemented as an atomic force microscope probe in the contact mode and nanoscale resolution is demonstrated.
Nonlinear refractive dynamics of CS2 are measured with the beam deflection technique. A response function model is fit, from which the pulse width dependent n2,eff is calculated and compared to Z-scan measurements.
A three-layer delay line anode detector has been used in x-ray pump x-ray probe time-resolved measurement at LCLS. We used ∼10 fs long pulses to initiate and probe ultrafast dynamics in the dication of acetylene. The dynamics are discerned from the temporal evolution of multi-particle coincidences.
By analyzing how carrier relaxation rates depend on pump fluence and sample temperature, we conclude that states of TbAs embedded in GaAs are saturable. This suggests the existence of a bandgap for TbAs nanoparticles.
We present evidence from transient-absorption spectra for quantum electron-hole droplets in GaAs quantum wells. Quantum droplets have a two-particle correlation function characteristic of a liquid, but, unlikemacroscopic droplets, have quantized binding energy.
We observed terahertz transmittances to study carrier dynamics in bismuth (Bi) thin film with optical pump-terahertz probe spectroscopy and terahertz pump-terahertz probe spectroscopy. Under the intense terahertz wave illumination, the transmittance of Bi thin film increases, indicating that the effective mass of the carriers becomes heavier due to the carrier acceleration by the intense field. Then,...
Linear and non-linear Fano interactions in a hybrid system consisting of surface plasmonic resonance and alkali vapor are presented. Using a pump probe apparatus, Doppler free lineshape and all optical modulation is experimentally demonstrated.
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