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We present analysis of electromechanical effects associated with collective optical excitation of electrons in plasmonic nanoparticles, with emphasis on the enhanced transfer of angular momentum and nonlinear hydrodynamics such as vortex pairs.
We present a fully integrated mid-infrared sensor. The laser and detector are fabricated from a bi-functional quantum cascade structure, connected through a dielectric-loaded surface plasmon waveguide, which acts as interaction zone and provides high coupling.
We experimentally demonstrate avalanche sub bandgap detection of light at 1550 nm wavelength via surface states using the configuration of interleaved PN junctions along a silicon waveguide. The device operates in a fully depleted mode.
By combining first and second order DFB gratings, a new solution for surface emission QCL is presented. A QWS mode and a buried hetero-structure process allow single mode emission and low dissipation devices.
We report a terahertz waveguide fabricated from doped crystalline silicon. Anisotropic chemically etching is used to produce a periodic array of concave pyramidal troughs in the silicon that provide confinement in both transverse directions.
Surface plasmon vortices with arbitrary pattern are synthesized via geometrical designs. The resulting vortex intensity patterns are experimentally measured using a near-field scanning optical microscope and are in good agreements as compared to numerical results.
Two resonant bands in enhanced optical transmission were predicted in a star shape bull's eye plasmonic structure. Fundamental and its second harmonic resonance were analyzed parametrically to find optimal conditions for linear and nonlinear responses.
A piezoelectric aluminum nitride film on oxidized silicon wafer is used to realize high frequency surface acoustic wave devices. Optical ring resonator is integrated with the surface acoustic wave device to demonstrate a high speed acousto-optic modulation.
Far field characterization of light propagation in metamaterial with multi metal-dielectric layers is performed by introducing rough surface and nano grating structures. Light directional imaging and evanescent wave moiré fringes are observed in experiments.
500 MHz surface acoustic waves travel across a commensurate plasmonic grating coupler. A stroboscopic optical technique shows that the dynamic surface deformation deliberately modulates the coupler's efficiency by +/−2% during the ∼ 2ns acoustic cycle.
We numerically study nonreciprocal regimes of surface plasmon-polariton at the interface between two gyrotropic media. We predict existence of isolated unidirectional TE and TM surface modes guided by the interface between gyroelectric and gyromagnetic media.
Spectral cleaning in bottle microresonators is presented by inscribing periodic surface microgrooves. Cleaning down to single strong WGM family is demonstrated, with Qs > 105 (similar to original microresonator).
We observe experimentally a transition of quality factor scaling from third power to fifth power of the number of periods in periodic silicon optical waveguides designed to exhibit a degenerate band edge.
We examine the influence of disorder over millimeter lengthscales, in the transport of photons. Super-collimation is achieved for varying controlled degrees of disorder in large-scale measurements, supported by physical theory and simulations.
We demonstrated electrically-driven subwavelength surface plasmonic nano-circuits integrating gap-plasmon emitting nano-LEDs and deep-subwavelength slot waveguides with a cross-sectional area of ∼0.016λ2 for the first time. Owing to the Purcell enhancement within the extremely small, metal-clad active region of the nano-LED, gap-plasmons are extracted efficiently. The gap-plasmons propagating along...
We demonstrate the use of Gas Cluster Ion Beam (GCIB) nanoprocessing technology for producing ultrathin silver waveguide and disk structures with smoother surfaces and wider grain sizes for enhanced surface plasmon propagation.
Precisely controlled blind via-holes were formed in multilayer substrates by an ultrafast laser. A LIBS detector integrated into the laser processing machine realizes the full potential of the ultrafast laser.
A Huygens' surface that efficiently refracts normally incident light to an angle φr = 35° at telecommunication wavelengths is reported. This represents the first experimental demonstration of an isotropic metasurface that provides wavefront control for arbitrarily polarized light.
We computationally study the irradiance enhancement in As2S3 motheye structures. We show that enhancement in the glass is minimal, matching with experiments showing an increased laser damage threshold for motheye structures versus thin-film AR coatings.
We demonstrate theoretically and experimentally the Rashba effect using light in two “counterpropagating” photonic lattices. We observe breaking of inversion symmetry in the resulting band structure.
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