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Nanosized materials, especially nanowires, have unique optical properties[1] and have been widely investigated as important building blocks for energy harvesting applications such as solar cells.[2] However, due to the large surface-to-volume ratio, recombination of charge carriers through the surface states of nanowires has been found to reduce the carrier diffusion lengths in nanowires a few orders...
We observe waveguide exciton-polaritons with large room temperature Rabi splittings of 190 meV and 125 meV for TE and TM modes respectively. The experimental results are in good agreement with numerical simulations.
Making use of the field enhancement and confinement, and thermal management, of a template-stripped localized surface plasmon resonance structure, we experimentally demonstrate the trapping and rotation of 110 nm diameter polystyrene nanoparticles.
We study a structure consisting of a gold disk array, an SiO2 spacer, and a gold film. We study the effect of spacer thickness on the anti-crossing between localized plasmons and surface plasmon polaritons.
We experimentally demonstrate optical trapping with micro-ring resonators. Tuning the incident wavelength enables controlled trapping and release of particles. The resonance frequency red-shift upon trapping enables monitoring of the particle physical properties.
We lithographically fabricate arrays of optical antennas with ~6nm gaps. The enhancement factor from surface-enhanced Raman scattering measurement is ~5 times larger than the same structure with ~18nm gaps.
Using a microfabricated zone plate array, we demonstrate detection of fluorescent beads at 12 locations along a serpentine microfluidic channel. Cross-correlations of the signals along the channel enable velocity dispersion measurements.
We demonstrate amplitude- and phase-resolved near-field mapping of nanoantennas by scattering-type near-field optical microscopy. The technique is applied to monitor the evolution of the near-field oscillations of infrared gap antennas progressively loaded with metallic bridges of varying size. Our results provide direct experimental evidence that nanoscale infrared near fields can be controlled by...
We experimentally demonstrate enhanced propulsion of polystyrene and gold particles by surface plasmon polaritons on gold stripes. The largest propulsion velocity enhancement, relative to total internal reflection, is measured to be 5 for polystyrene particles.
Surface enhanced Raman spectroscopy is performed on mixed dimers, consisting of pairs of gold nanoparticles with different shapes and plasmon frequencies. These are termed double resonance substrates. The results are compared to double dimer geometry.
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.
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