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We theoretically model the nonlinear dynamics of plasmonic waves in gold nanowires. We find that the thermo-modulational nonlinearity of gold leads to a strong spectral redshift of input pulses in a few microns of propagation.
Giant (1%) picosecond strain pulses are generated in a fs-laser-irradiated cobalt transducer sandwiched between a gold layer and sapphire substrate. Ultrafast plasmonic interferometry reveals nonlinear acoustic propagation effects in the (111) gold film.
We report a highly-sensitive technique to obtain mid-infrared spectra with nanoscale spatial resolution via detecting a mechanical force exerted by vibrating molecules on an atomic force microscope tip. Sub-monolayer sensitivity is demonstrated.
The influence of fs-pulse train period on the Au nanoparticles production was studied. Using a pulse shaping technique, the period was tunned in order to match Raman resonances that enhance the Au nanoparticle formation process.
Polarization conversion of metal-helix based metamaterials can be eliminated by recovering four-fold rotational symmetry. Symmetry considerations and current progress in the fabrication of N-helix optical metamaterials as broadband circular polarizers is presented.
We investigate the feasibility of titanium nitride (TiN) nanoparticles as local heat sources in the near infrared region, focusing on biological window. Experiments and simulations provide promising results for TiN, which is known to be bio-compatible.
We report the strong surface plasmon amplification of the finite-width gold microstripline on Nd:YVO4 crystal substrate at 1064nm. The low-loss plasmonic 2D waveguide may be advantageous for potential applications in standard optoelectronics devices.
We demonstrate dispersion control of near-infrared surface plasmon polariton by tuning the filling fraction of a multilayer metallo-dielectric hyperbolic metamaterial. We show that effective medium approximation accurately provides the dispersion behavior for a structure with only 2.5 periods.
Ballistic hot electrons in fs-laser-excited gold are used to generate ultrashort (2 ps duration) acoustic pulses in cobalt. The exponential dependence of the acoustic amplitude on gold thickness provides the electron mean-free-path of 120 nm.
We examine the fluorescence enhancements from various 3D metallic nanoantenna/molecules structures with different antenna shapes, metal types and spacer-molecule lengths. The results allow us to engineer optimal metallic structures for the fluorescence enhancement.
Despite unique and fascinating capability in subwavelength optics, active control of optical plasmon resonance has been hampered by drastically weak optical response of free carriers at optical frequency. We demonstrate efficient control of optical plasmon resonance in gold nanorod with graphene by electrical gating.
With the aim of using plasmonics in an integrated-circuit scheme where single quantum emitters can be probed efficiently, we comprehensively study the scattering properties of single gold Yagi-Uda antennas placed on one-dimensional silicon nitride waveguides.
A microscopic theory of plasmon-enhanced metal photoluminescence is developed. New mechanism of luminescence suppression in small nanostructures is identified: excitation of Auger plasmons by core holes. Our numerical calculations are in excellent agreement with experiment.
The impact of gold nanoparticles to stress fibers (SFs) in HUVEC cells was studied by cutting the SFs from their mid-point with a femtosecond laser and recording their recoil dynamics in the real time.
Au nano-particles on the bottom surface of a photobioreactor are used as scattering elements and are shown to enhanced oxygen evolution rates in cultures of cyanobacteria by increasing the light path length through the culture.
It is experimentally demonstrated that subwavelength holes milled in a metallic film as a set of concentric circular rings can focus linearly polarized light in the visible range.
We combine direct laser writing with electron-beam lithography to fabricate arrays of 3D tapered gold double-helices with feature sizes well below 100 nm, enabling chiral metamaterials and helical nanoantennas at telecom frequencies.
The steering, control or switching of electron wavepackets by light is expected to pave the way towards the much wanted visualization of nanoplasmonic field dynamics or real-time probing of electron motion in solid nanostructures. Electron pulses generated by strong-field tunneling from sharp gold tips irradiated by few-cycle laser pulses and accelerated in the near field are believed to be suitable...
We report on the plasmon-enhanced emission of silicon nanocrystals located at a controlled distance from gold nanoparticles. A maximum enhancement factor of 6 is observed at the optimum distance.
We fabricate a large area (3 × 3 cm2) polydimethylsiloxane-based substrate for surface-enhanced Raman scattering by combining femtosecond laser microstructuring and soft lithography techniques. The substrate exhibits broadband absorption in the region of 350–1000 nm and reproducible enhancement factor ∼107.
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