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The fluorescence quenching of a single molecule can be controlled using a plasmonic device made of a metallic or negative-index slab and a metallic nanoparticle. The concept of dark near-field fluorescence imaging is introduced.
We demonstrated a novel fabrication technique of highly monodispersed noble metal nanoparticles by femtosecond pulsed laser irradiation of aqueous solution.
Photonic crystal fibers were demonstrated as an optimal platform for enhancing the Raman signals to study nanoparticles properties in liquids. Raman was used to analyze stages of low concentrations of ZnO nanoparticles growth in solution.
We present a method using either laser or white evanescent illumination combined to spatial modulation and camera lock-in detection allowing the measurement of scattering images and spectra of individual gold nanoparticles.
We directly observe three-dimensional motion of a gold nanoparticle on the membrane of a living cell by using non-interferometric widefield optical profilometry. We identify the occurrence of particle internalization and actin aggregation which indicates endocytosis.
Using pump-probe reflectometry, we study the ultrafast excited-state dynamics in thin films of BuPTCD, an organic semiconductor, deposited on gold nanoparticles. We observe depletion of the ground state and excited state absorption after photo-excitation.
Near-field optical spectroscopy of nanoscale Ga droplets on GaAs exhibits quenching of photoluminescence emission due to coupling with surface plasmon. Ga droplets exhibit antenna like behavior associated with a red-shift in the near-field photoluminescence emission.
We generate high-order harmonics from ablation plasma containing an abundance of nanoparticles. Results show that the use of nanoparticles targets enhances the harmonic intensity, and also shifts the harmonic spectrum in wavelength.
Nonlinear magneto-optical properties of magnetic core(shell) gamma-Fe2O3(Au) and Fe3O4 (magnetite) nanoparticles are studied. Nonlinear magneto-optical Kerr effect in hyper-Rayleigh scattering at the second harmonic wavelength is about 10-20% for both types of nanoparticles.
Methods to insert, keep and fix silver and gold nanoparticles to the inner walls of microstructured fibers are demonstrated. Fibers optimized for evanescent field interaction were employed and can result in efficient plasmonic chemical sensing.
We study theoretically the interactions of excitonic states with surface electromagnetic modes of a single-walled carbon nanotube. We show that these interactions result in the exciton-plasmon coupling that is significant in its strength due to the presence of weakly-dispersive low-energy (~0.5-2 eV) interband surface plasmon modes and large exciton excitation energies ~1 eV in small-diameter nanotubes...
Polarization resolved detection of the scattered light by a gold nano-particle functionalized tip, off a propagating surface plasmon polariton wave enables quantitative studies of the image dipole orientation effects on flat metal surface.
We report the use of a dual-clad optical fiber for two-photon excited fluorescence correlation spectroscopy. The ability to detect nanoparticles has been demonstrated. This technique shows the potential of conducing FCS measurements invivo.
We apply the ldquoeffective mode volumerdquo theory to evaluate the enhancement of the efficiency of electroluminescence of the semiconductor placed in the vicinity of isolated metal nanoparticles and their arrays and show that using random assembly of isolated particles holds an advantage over the ordered arrays.
We study the trajectory of the magnetization in cobalt nanoparticles using femtosecond pulses. We show that the initial pathway of the magnetization vector is mostly determined by the magnetic anisotropy of the assembly of nanoparticles.
Optical tweezers are typically used on transparent dielectric particles. Particles with optical resonances would experience larger trapping forces and allow trapping of smaller particles. We present a study of increased trapping forces on such particles.
The surface plasmon coupling between gold nanoparticles in a periodic array is theoretically modeled. The calculated dispersion relation and loss properties of an array of chains at air/glass interface agree well with FDTD simulation results.
The optical properties of Si nanostructures of varying dimensionality, size and fabrication methods is discussed. The Auger coefficient of TiSi2-catalyzed Si nanowires is 2times10-13 cm3/s, lower than that of Si nanoparticles. To avoid ensembles artifacts, fabrication and optical analysis of single nanowires and nanoparticles is presented.
We present plasmonic tweezers that makes use of localized surface plasmons from a close-packed Au nanoparticle (NP) array. This device is able to realize long-range trapping and orientation control of single nanorods with a very low optical intensity requirement.
We prepare diffractive arrays of metal nanoparticles that possess molecular and structural chirality. Both cases lead to comparative chiral polarization effects, which must be interpreted as arising from chirality of the experimental setup.
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