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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 have investigated the Bragg gratings for surface plasmonic polaritons modes in the metal-dielectric-air waveguide and proposed a bidirectional coupler which is capable to guide the incident light at different wavelengths along two predetermined directions.
We demonstrate that since the group velocity of spoof surface plasmon polariton modes at the cutoff frequency is extremely low, electromagnetic waves with different frequencies can be slowed down or even stopped at different positions.
Resonant terahertz reflection of periodic metallic rectangles is investigated. The reflection resonance, primarily attributed to dipolar localized surface plasmons, is influenced by a number of factors and is well fit by the Fano model.
ITO supports surface plasmon polaritons above 2.28 mum wavelength in symmetric glass-ITO-glass waveguides. Here, we report the dispersion relationship and experimental findings.
We report on a method to generate an interference pattern from a slit-groove structure. Although we have not used a double-slit, a Young like interference pattern is observed due to the effect of surface plasmons.
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.
Single and multiple holes in optically thick gold layers are investigated with cathodoluminescence to obtain optical information beyond the diffraction limit. Excitation patterns and spectral shapes are observed to shift when the hole shape is varied. It is shown that the specific relative orientation of dimers and trimers of holes leads to shifts in the spectrum and changes of the excitation patterns.
A novel interrogation technique using chirped femtosecond pulses to realize high speed SPR measurements is proposed. The scanning time can be as short as several nanoseconds. Its ability to make sensitive measurements is experimentally demonstrated.
We demonstrate polarization rotation of a terahertz electromagnetic wave with complimentary double-layered metal chiral gratings. We obtain an isotropic polarization rotation free from the birefringence of the structures.
Resonant coupling to highly confined plasmonic modes in a metal-dielectric nanoscale multilayer on top of a silicon guiding core is proposed for polarization control in silicon-on-insulator waveguides.
We propose to use low group velocity modes on a surface plasmon grating to mediate emission from colloidal quantum dots. We demonstrate the modification of emission wavelength and coupling as the grating periodicity is changed.
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...
We report on the coherent coupling between surface plasmon polaritons and quantum well excitons in a hybrid metal-semiconductor nanostructure. The coupling is probed by angle-resolved low temperature spectroscopy and analyzed within a coupled oscillator model.
The Q-factor of a localized plasmon cavity is enhanced significantly when allowing the plasmon to very slightly propagate as an SPP. The resulting mixed plasmon - plasmon polariton resonators retain sub-100 nm volume with enhanced Q-factors.
We have modeled plasmonic waveguides that support low-loss modes using configurations compatible with metal-oxide-semiconductor devices. Our experimental verification with visible wavelength analogs demonstrates that silicon-based plasmonic modulators are possible.
We investigate sub-wavelength diffraction by a single slit, both in nano-optical and in terahertz regimes. The wave-front in optical regime separates itself into forward propagating beam and surface-bound 90-degree diffracted wave, i.e., surface plasmon polaritons.
We measure the femto-Newton forces produced by 2D surface plasmon optical traps able to trap micro-colloids at a patterned metal surface under low laser intensity.
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.
Avalanche concentration, a rapid long-range accumulation of particles around a laser spot in a liquid sample, is demonstrated and characterized for VO2 nanorods. The effect is found to be driven by a convective flow in the sample, caused by efficient heating of VO2 nanorods that transition from insulator to metal within the laser spot.
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