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It is shown that optomechanical forces can cause nonlinear self-channelling of light in two parallel silica nanowebs suspended inside a fibre capillary. The effective optical nonlinearity is a million times higher than the Kerr effect.
We interface single photons generated by a quantum dot with those generated via parametric down-conversion. The photon indistinguishability is assessed by measuring their coalescence probability; it is 16% and limited by quantum dot decoherence.
We report on the observation of relativistic wave evolution in a waveguide array. The high frequency trembling motion, known as Zitterbewegung is observed in specially designed waveguide arrays.
We demonstrate that, for an entire class of optical beams, nonconservative forces can point in a direction opposite to propagation wavevector. The properties of these forces are examined in the Rayleigh and geometrical optics limits.
Whispering gallery mode splitting in high quality-factor InAs quantum dot micropllars is observed and attributed to resonant scattering from the dots themselves. Low-threshold multimode lasing with beta-factors approaching unity is demonstrated.
We observed an ultrafast charge generation and transfer in a carbon nanotube network by a novel pump-probe spectroscopy that makes use of a broadband and positively chirped pump and transform-limited probe pulses.
We experimentally demonstrate and explain phonon “lasing” (“PhASER”) in a photo-pumped micromechanical cavity that exhibits all the characteristic of a standard laser near threshold and is described by the standard laser equations.
Utilizing a novel implementation of differential luminescence thermometry we accurately measure laser cooling efficiency spectra of solids. Cooling to 110K is shown in Yb:YLF at the E4-E5 Stark manifold resonance as predicted by theory.
Lasing in ZnO nanowires is often interpreted as exciton lasing. However, our experiments and theoretical calculations on the laser threshold and the emission spectrum show that ZnO nanowire lasing is electron-hole plasma lasing.
We report on a spin-symmetry breaking in thermal radiation from a coupled thermal antenna array, supporting localized phonon-polaritons, whose local anisotropy axis is rotated in space.
Atom-mediated optical nonlinearities, generated within an atom-light quantum interface, allow spin measurement with sensitivity that scales better than the Heisenberg limit. This demonstrates interactions as a new resource for quantum metrology.
We show that a perfect lens can be utilized to make multiple objects appear like one. This anti-mirror effect may lead to applications in enhancing the illumination brightness of both incoherent and coherent systems.
We have accomplished rigorous dispersion analysis and showed clearly impact of nonlocality on properties of multilayered metal-dielectric metamaterial. The main discovered effect is an appearance of additional extraordinary waves in the metamaterial which leads to the splitting of the TM-polarized beam at the air-MDN interface.
We demonstrate zero phase delay and deterministically tunable zero-n bandgaps in path-averaged zero-index photonic crystal superlattices. Phase differences are measured with integrated Mach-Zehnder interferometers and all measurements agree well with theoretical analysis and simulations.
A microscopic picture of the emergence of one-way edge mode in a honeycomb lattice of resonators made from magneto-optic material is obtained using tight binding model. One-way slow light scheme is proposed based on the edge mode.
The performance of metamaterial and transformation-optics devices is limited by losses in their plasmonic components. We show that ceramics (heavily doped-zinc oxide and titanium nitride) could help in overcoming the loss issue in the optical range.
We show here that left handed electromagnetic fields can be established over extended regions in fully dielectric structures. Particles immersed in such field configurations would move upstream against the radiation pressure of the incident wave.
We demonstrate a light-shot-noise-limited magnetometer based on the Faraday effect in a hot unpolarized ensemble of rubidium atoms. By using off-resonant, polarization-squeezed probe light, we improve the sensitivity of the magnetometer by 3.2 dB.
We present a technique based on full-field heterodyne holography for the mapping of the scattered field of plasmonic gold nanoantennas in all three dimensions. A spectroscopic study allowed us to determine resonant and non-resonant wavelengths at which we conducted a full characterization of the scattered field for different polarizations and for a wide range of antennas. These results are compared...
We investigate a scatterer comprising a dielectric core and randomly distributed metallic nanoparticles forming a shell. We show that it acts as an isotropic magnetic meta-atom and as a cloak to conceal the core.
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