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We have created microcavity polaritons with a lifetime of about 200 ps, which allows them to condense in the ground state of a ring trap. Optical measurements show they have quantized vorticity.
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.
We present the fabrication and characterization of a graphene stack that can function as the darkest material and serve as the basis for a new class of sensitive, high-speed photodetectors.
A polarization line-by-line pulse shaper is used in analytically measuring optical arbitrary waveforms (OAWs) of 100% duty cycle without reference, which is essential for high repetition rate OAWs.
Combining a multi-color homodyne detection scheme with techniques from quantum optics, we show the feasibility of shot-noise limited measurements of a medium's parameters, while also being able to compensate for their fluctuations.
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.
Near-infrared epsilon-near-zero metamaterial slabs based on Ag-Ge multilayers are experimentally demonstrated and numerically analyzed. A post-annealing process and multilayer grating structures are introduced to reduce the optical loss and also tune the epsilon-near-zero wavelength.
We demonstrate an all fiberized, passively mode-locked thulium holmium co-doped fiber laser operating at a wavelength of ∼1.95 µm using the graphene-oxide evanescent field interaction. A temporal pulse width of ∼590 fs is experimentally obtained at 33.25 MHz.
We suggest using divergence angle as a quality parameter for pure fiber modes. We demonstrate a measurement of the divergence angle of an LP11-mode and obtain agreement with numerical predictions with 2-digit precision.
Experimental evidence of enhanced spontaneous emission from InP coupled to an optical antenna is presented. Photoluminescence measurements show a 120x increase in light emission from antenna-coupled devices over bare InP emitters.
We report implementation of a configurable network of four degenerate optical parametric oscillators as an Ising spin system using time-multiplexed femtosecond pulses. This coherent Ising machine solves an instance of NP-hard MAXCUT problem without error.
We introduce a helix-based metamaterial, a circular polarization converter, composed of pairs of oppositely-handed helices on a square array. We compare our theoretical findings to measurements on samples made by laser lithography and electroplating.
Non-perturbative on-chip light observation is achieved in silicon photonics waveguides by a novel integrated photonic probe. Light intensity monitoring is performed over 40 dB dynamic range, −30 dBm sensitivity, and microsecond scale time response.
We generated ultrabroadband coherent infrared pulses by focusing hollow-fiber compressed intense 10-fs pulses in air. We also coherently detected the electric-field profiles in the whole infrared range through the field-induced second harmonic generation in air.
A dispersion spectrum in a 3.2 Tbit/s waveform generation was controlled / compensated by a 200 GHz optical frequency comb synthesizer and optical frequency comb analyzer simultaneously.
We demonstrate the first technique for the complete temporal measurement of a single supercontinuum pulse. We achieve large ranges and high resolutions using polarization gating, a tilted gate pulse, and the cancellation of geometrical smearing.
We propose frequency-resolved optical gating capable of carrier-envelope phase determination using a reference pulse with a tilted pulse front. Real-time complete waveform measurement of ultrashort pulses has been demonstrated with the method.
Topological insulators have been recently extended to photonics; however, the measurement of their topological invariant has been limited to probing edge states, an indirect measure. Here we optically measure a topological invariant using only bulk information.
To predict in-vacuum optical damage performance of Advanced Radiographic Capability Petawatt final optics we have developed a ps-damage test station to measure damage density and compare results to R-on-1 tests.
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