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We will discuss the use of dense periodic nanogap arrays for plasmonic sensing applications. A high-throughput fabrication process will be presented, that yields nanogap arrays with periodicities above 150 nm, and with accurately controlled gap widths of ±1.5 nm over mm2 large areas.
We show that high-intensity Airy pulses propagating in Kerr-type nonlinear media can preserve their self-accelerating features under appropriate conditions. By engineering the input pulses, controllable spectral shifting and reshaping are achieved.
Many-body interactions in a doped CdTe/CdMgTe quantum well are investigated using optical 2D Fourier-transform spectroscopy. The nature of coherent exciton-trion correlations is examined by analyzing lineshapes in the 2D spectra.
We demonstrate that meta-materials with extreme anisotropy allow for diffraction-free, deep sub-wavelength beam propagation and manipulation, as well as deep sub-wavelength imaging. We show a metamaterial design using existing materials.
Carrier dynamics in graphene at low energies are studied using two-dimensional THz spectroscopy. Pump-probe signals much faster than the acoustic phonon energy are observed due to a combination of intra- and interband absorption.
Sub-picosecond terahertz pulses are used to refresh or switch off the macroscopic intersubband polarization of a quantum well at low temperature. This coherent switching is directly observed in the time-domain and agrees with model calculations.
We investigate the interaction of strong single-cycle THz pulses with a coherent excitonic population, observing the transition from Rabi flopping of the 1s-2p transition to multi THz-photon ionization with increasing field strength.
We report on the utilization of optical sub-wavelength quasi Fabry-Perot cavity coupled with the Raman microscopy to study the interaction between the localized surface plasmon resonance of gold nanoparticles and the surface plasmon resonance of a gold film. We show an enhancement of the Fabry-Perot oscillations when the distance between nanoparticle and gold film decrease.
We show theoretically and experimentally that photonic lattices constructed from random components residing on a ring in momentum space are amorphous, yet they exhibit a bandgap, and support linear and nonlinear defect-state guidance.
We report the first observation of classical Bloch-like oscillations and revivals of light in a new class of dynamic optical systems-the so-called Glauber-Fock oscillator lattices.
We here report about subwavelength metallic aperture on infinite plane acting as polarization analyzers for magnetic field following Bethe's diffraction, analogous to conventional polarizers determining the electric field direction.
We theoretically and experimentally demonstrate that transverse instability of soliton stripes can be greatly suppressed when the solitons propagate in a 1D lattice under self-defocusing nonlinearity.
We report on the optical measurement of the backscattering matrix in a weakly scattering medium. A decomposition of the time reversal operator allows selective and efficient focusing on individual scatterers, even through an aberrating layer.
We show that full compensation of loss in plasmonic waveguides with significantly sub-wavelength light confinement (less than λ/4n) requires current density in excess of 100 kA/cm2 making sub-wavelength in all three dimensions laser (spaser) impractical.
We present the dynamical creation of electron-positron pairs due the instability of the quantum vacuum. We observed this effect in an optical model system which is an array fabricated by femtosecond laser direct inscription.
We have derived an efficient model that allows calculating the dynamical single-photon absorption of an emitter coupled to a waveguide. We suggest a novel and simple structure that leads to strong single-photon absorption.
Single-mode lasing at ∼628 nm above an absorbed pump power threshold of 67.5 μW, tunable within a 2.1-nm range (30% of the free-spectral-range) was obtained from colloidal CdSe/CdS core/shell nanorods on whispering-gallery-mode silica microspheres.
We demonstrate nonlinear frequency conversion in hydrogenated amorphous silicon (a-Si:H) with conversion efficiency of −13dB at telecommunication data rates. Conversion bandwidths of 150nm are measured in CW regime at telecommunication wavelengths.
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