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A microscopic theory is applied to describe nonlinear terahertz excitations of optically-dark excitons in Cu2O. The theory is quantitatively compared to recent experiments. Signatures of Rabi flopping and ponderomotive contributions are discussed and disentangled.
We report quantitative spectrally-resolved transient absorption in GaAs quantum wells for varying pump intensity. Comparison to microscopic modeling yields quantitative information about the Coulomb-induced nonlinearities and radiative coupling.
Studies are presented that combine optical and THz excitation in the linear and nonlinear regimes. The analysis focuses on exciton formation and decay, the plasmonic response, THz gain, excitonic Rabi flopping, and quantum-state control.
We report a gain-enhanced and spectral-narrowed optical parametric oscillator based on a monolithic PPLN integrating an optical parametric generator with two electro-optically active polarization-mode converters. Unique spectral manipulation of the OPO signal is also demonstrated.
Continuous channel waveguides in periodically poled KTiOPO4 with guided orthogonal polarizations are used to demonstrate type-II background-free second harmonic generation at 1505 nm with 1.2 %/(W cm2) normalized efficiency.
Direct near-field optical imaging of a bowtie nano-antenna was observed using a UV near field scanning optical microscope. A strong localized UV light spot was observed at the tip of the bowtie structure.
We report the experimental demonstration of pulsed-pump wavelength exchange for all-optical time de-multiplexing of 160-Gb/s RZ signals. Power penalty les 2.7 dB at 10-9 was achieved for all de-multiplexed 10-Gb/s RZ signals.
We present a new technique to coherently control ultrafast nonlinear processes in a plasmonic nanostructure on a femtosecond timescale. By using a four-photon process our detection provides full information about the coherence in the system.
We present an organic supramoleular assembly with a high off-resonant third-order susceptibility, easy fabrication into homogeneous thin films, and high-optical quality for ultra-fast all optical data processing.
A new type of tellurite chalcogenide glass is proposed and simulated at the microscopic molecular level using GAMESS. The ab initio study shows that the optical linear polarizability alpha and second-order hyperpolarizability gamma per unit increase ~1.5 times and ~2 times respectively by replacing O with S in chain-like structures Te<Ox>Te (X=O or S), resulting in an estimation of linear refractive...
We investigate the coherent dynamics of excitonic wavepackets in semiconductors driven by intense narrowband THz pulses. Time-resolved THz-pump and optical-probe measurements demonstrate strong nonlinear-optical transients of the light-hole and heavy-hole excitonic resonances in GaAs/AlGaAs QWs.
Through FROG-CRAB based on attosecond streaking, we characterized 140 attosecond single isolated pulses generated with a double optical gating using 9 fs lasers.
We have examined a femtosecond pulse shaping phenomenon induced by self-organized Ag nanoparticle arrays. Significant pulse shortening was observed as plasmon resonance occurs between the array and femtosecond pulses.
We observe the propagation of 1D Airy beams through an unbiased photorefractive crystal. For ordinary polarization, the beam diffracts, while for extraordinary polarization it experiences nonlinearity through charge diffusion and has its diffraction suppressed.
We propose new second-harmonic-generation probes of surface chirality, based on circular polarizations or handed superpositions of radial and azimuthal polarizations. Because of normal incidence focusing, the techniques are not sensitive to anisotropy.
Nonlinear index was investigated in undoped and Yb-doped monoclinic double-tungstates for EparNm and EparNp polarized 819 nm light. Anisotropic n2 with maximum for EparNm in all investigated compounds is proportional to the rare earth ion polarizability.
The optical properties of gold nanorods suspended in toluene are studied as a function of orientation by aligning them with a low frequency electric field. The nonlinear optical response is consistent with a 2-level saturation model.
Quantum rods (QRs) are incorporated into polymers that are doped with azo dyes via an energy transfer process. The polarization-dependent refractive-index change allows four-dimensional optical data storage as well as other polarization-controlled photonic applications.
By varying the polarization and delay between two ultrashort laser pulses, we control the plane, speed, and sense of molecular rotation. This control may be implemented to individual components within a molecular mixture.
We demonstrate the spontaneous Raman effect in suspended InGaAsP waveguides and report that the zinc blende Raman selection rules are relaxed in the waveguide geometry. The suspended semiconductor waveguide is an exciting platform for a range of linear and nonlinear optical experiments due to its enhanced light-guiding capability.
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