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A simple and robust technique to extract the complex optical conductivity of truly two-dimensional materials is developed. Applying the method to chemical-vapor-deposited graphene, we extract the complex conductivity, including Fermi level and scattering time.
The near-field tip-antenna enhanced signal transduction with femtosecond laser pulses allows for spatio-spectral and spatio-temporal imaging and quantum coherent control with the perspective to reach the single electronic or vibrational quantum level.
We present the first experimental realization of optical supersymmetry and demonstrate mode conversion and global phase-matching between SUSY partner structures. Our results may pave the way for compact and highly efficient integrated mode-division-multiplexing schemes.
Here we numerically investigate Brillouin scattering (BS) in a silicon slot waveguide. We show that BS is strongly influenced by the boundary effects, instead of the usual photo-elastic effect leading to the interaction with distinct mechanical modes.
We demonstrate coherent control of the generalized Snell's law in ultrathin gradient metasurfaces constructed by an array of V-shaped slot nanoantennas.
A monolayer of MGITC molecules in a gold nanosphere-plane junction is excited by focusing a radially polarized laser beam. A record electromagnetic enhancement factor of 1010 for deterministic SERS experiments has been obtained.
We report the observation of spin currents and spin polarization textures in optically generated indirect excitons. The textures are observed in linear and circular polarizations and are controlled by magnetic fields.
We report on spinoptical metasurfaces manifested by spin-controlled optical modes - optical Rashba effect, where the inversion symmetry is violated. The design of metasurface symmetries via geometric gradients provides a route for spin-controlled nanophotonic applications.
Determination of the absolute handedness of single enantiomer at small quantities is essential in chiral drug developments. Here we provide theoretical insights, numerical analysis and experimental demonstrations of high sensitivity to zepto moles of chiral molecules using optical metasurfaces. We introduce a figure of merit (FoM) for metasurfaces that can be extracted from simple far-field scattering...
We trap and rotate particles using a perfect vortex beam with integer or fractional topological charges. A linear relationship is observed between the rotation speed and orbital angular momentum content of the beam.
We report on the fabrication and characterization of two polarization maintaining multicore fibres, one with three and the other with ninety eight cores. The beat length and polarization orientation are characterized.
We demonstrate electromagnetically induced transparency in sideband-resolved Si3N4 optomechanical crystals supporting optical modes in the 980 nm band and ≈ 4 GHz mechanical resonances, in both ambient conditions and at cryogenic temperatures.
The temperature of absorbing particles changes under external illumination. In turn, this temperature distribution modifies the viscosity properties of the surrounding fluid leading to nonstationary dynamics and to ultra-fast optically induced motion of particles.
We investigate the carrier relaxation dynamics in graphene oxide (GO) using ultrafast optical-pump terahertz-probe spectroscopy. Unlike graphene, we observe the dynamics of GO show rapid percolation behaviors related to the multi-particle Auger scattering.
Photoexcited charge carriers in 2D graphene and in 1D graphene nanostructures were studied with optical pump-THz probe spectroscopy. We find efficient hot-carrier multiplication in 2D graphene, and predominantly free carrier early-time response in 1D nanostructures.
In this work we experimentally demonstrate suspended gold-air-gold (MIM) plasmonic waveguides operating at the NIR wavelengths. The waveguide interfaces with the far field using optical nano-antennas with main beams normal to the structure.
Metallic nanostructures give rise to bright and dark plasmon modes, and through their interactions can support a variety of coherent phenomena more typically associated with atomic systems, providing new sensing and energy transfer strategies.
We introduce the novel concept of a single-element Fano nanoantenna allowing for strong directional scattering of light in opposite directions depending on wavelength. Our design opens the way for novel bi-directional wavelength multiplexers.
We presented the method of using visible-light optical coherence tomography (vis-OCT) for retinal oximetry. We demonstrated for the first time in vivo OCT measurement of the arterial and venous oxygenation in retinal circulation.
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