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We coherently probe a quantum dot, strongly coupled to a photonic crystal nano-cavity, using a resonant laser beam. At higher pump power, the coupled system’s response becomes highly nonlinear. This coherent probing method has applications for classical and quantum information processing.
We propose complex networks constructed from interacting vector solitons. Within soliton-based networks, we demonstrate memory effects that are greatly enhanced by noise, as well as spontaneous entire network self-synchronization effects.
We study the extended modes of a nonlinear quasi-periodic system and show that the nonlinear spectra are deformed versions of the Hofstadter Butterfly. An optical realization of the Hofstadter butterfly is proposed.
We present experimental and numerical results of wavepacket expansion in one-dimensional disordered nonlinear waveguide arrays. We show that in 1D there is a direct transition from ballistic expansion to localization, which is accelerated by nonlinearity.
Linear guidance of dipole modes in an optically induced ring lattice with a low-refractive-index core is demonstrated both theoretically and experimentally. These dipoles are guided in the low-index region of the lattice. Such guidance results from anti-resonance or bandgaps in waveguides rather than the total internal reflection.
We have excited bowtie-shaped metal nanoantennas fabricated with colloidal lithography by picosecond light pulses. The spectrum emitted by the nanoantennas consists of a broadband continuum overlapped with a narrowband second harmonic signal.
We present the formulation of wave propagation in arrays of subwavelength waveguides with sharp index contrasts. We demonstrate the collapse of the bands into evanescent modes, and propagation of lattice solitons with superluminal phase velocity.
Second harmonic generation (SH) based on the enhancement of localized fields confined in nanoscale periodic, GaAs-filled holes in a metal film is presented. The SH saturates for a fundamental peak power intensity ≫ 20 GW/cm2.
We observe Rabi oscillations in one-dimensional waveguide arrays. Adiabatic transitions, both direct and indirect (phonon-assisted), between extended Floquet-Bloch modes associated with different bands are stimulated by index-gratings inducing periodic modulations along the propagation direction.
We show that trench defect in a photonic crystal slab leads to efficient wave-guiding. Based on trench-waveguide geometry, slow-light devices and coupled-cavity micro-resonator arrays can be fabricated with scalable (holographic) photolithography avoiding electron-beam lithography.
We applied adaptive pulse-shaping for real-time observation of coherently controlled wave-packet motions. Individual excitation of twisting and bending modes was successful in a cyanine dye molecule by using a chirped pulse sequence.
Ultrashort pulse light-matter interactions in a semiconductor are theoretically investigated within the regime of resonant optical rectification. Using 5 fs pulse envelope areas of around 1.5–3 π, a single-shot dependence on carrier-envelope-offset phase.
We present results of a microscopic theory for the photon correlation functions g(1)(τ) and g(2)(τ) describing the first-order coherence and the photon statistics of quantum-dot-based microcavity lasers with large spontaneous emission coupling.
Nickel nanowires present ≫90% absorption in an effective skin-depth ∼1 μm, making efficient x-ray converters. We present new theoretical and experimental results for intensities from small-signal up to very clean relativistic pulses.
Femtosecond laser induced alignment and periodic recurrences of room temperature hydrogen and deuterium molecules are measured in a single shot for the first time, using single-shot supercontinuum spectral interferometry (SSSI). The measurements are also performed in oxygen and some other common linear molecular gases. Employing time-dependent first order perturbation theory, an analytical model of...
We report the first experimental study of plasmas created by photoionization of solid targets with focused soft x-ray laser light. The plasma properties are dominantly determined by material absorption, in agreement with model simulations.
Ultrafast laser pulse shaping makes it possible to observe nonlinear signatures, such as self phase modulation and sum frequency absorption, at safe laser powers for tissue. Neuronal activation and melanoma diagnosis are two early targets.
Nanogratings spaced at 630 nm on NiTi alloy surfaces are produced by self-organized nanoplasma planes following scan of linearly-polarized femtosecond laser pulses. Their formation characteristics are investigated. Theoretical analysis matches well with our observations.
We experimentally study Poynting vector flows when terahertz waves transmit through a multiple slit arrays. Our methods provide a new way of visualizing energy flows and determining different diffraction orders in the near-field.
The terahertz dielectric properties of several heterostructures based on epitaxial SrTiO3 and DyScO3 thin films were characterized without and under applied static or low-frequency electric field. We demonstrate up to 65 % variation of the permittivity of SrTiO3 films and up to 35 % modulation of the power transmission of terahertz waves at 500 GHz and 112 V (75 kV/cm) bias.
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