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Nanobeam laser with threshold 230 nW is demonstrated in continuous-wave operation at room-temperature. This is achieved by reducing the size of active medium to 1.5×0.3×0.02 μm3 via selective wet-etching of a single quantum well layer.
A high-temperature fiber optical hydrogen sensor is demonstrated. The sensor is based on single-crystal sapphire fiber coated with nanostractured Pd-doped TiO2 thin film. The sensitivity of the sensor was evaluated for hydrogen concentrations varying from 0.02 % to 3% at temperature up to 800°C.
We investigate the phase-noise properties of a tunable single-pass optoelectronic frequency comb generator. Residual phase noise at 1 Hz offset from a 10 GHz carrier is as low as −100 dBc/Hz.
A hybrid silicon ring laser in which the counter-clockwise circulating power is coupled into the clockwise mode is demonstrated. Unidirectional clockwise laser output is achieved with a suppression ratio of 19 dB over the counter-clockwise mode.
Wavelength tuning in a single mode parity-time (PT) symmetric semiconductor microring laser is demonstrated. Stable continuous tuning over a spectral range of 4 nm has been obtained at telecom wavelengths by adjusting the ambient temperature.
Upconversion detection can isolate the temporal and wavelength window over which light can be efficiency received. Using appropriate designs the ability of an eavesdropper to damage, measure, or control QKD receiver components is significantly constricted.
We theoretically analyze a nonlinear optofluidic process produced by radiation pressure of a high quality factor whispering gallery mode in a liquid droplet. Using liquid properties that are experimentally attainable, we find that such a process may lead to photon-photon interaction at single photon energy level.
We present the first circularly-polarized soft X-ray harmonics to photon energies >160eV. Bright phase matched beams are used to characterize important materials with intrinsic perpendicular magnetic anisotropy for the first time using tabletop sources.
We report first experimental demonstration of a warm atomic memory operating at a single-photon-level, capable to store and retrieve up to 120 spatial modes. We present unambiguous spatial g(2)(θS,θAS) cross-correlations between heralding and retrieved photons stored up to several microseconds.
We experimentally demonstrate the ability to couple any polarization state from a fiber to the TE-mode of a single waveguide in an integrated silicon photonics circuit. We achieved this by combining a 2D-grating coupler and two tunable Mach-Zehnder Interferometers (MZI) into a polarization adapter. We obtain less than ±0.6 dB standard deviation across all input polarization states at a wavelength...
We demonstrate a room-temperature continuous-wave electrically injected unidirectional-emission AlGalnAs/InP multiple-quantum-well microspiral disk laser with a 44mA threshold current. Above 130 mA, the laser shows a unidirectional emission from the waveguide butt-coupled to the microspiral notch.
Quantum-confined Stark effect of Ge(Sn)/SiGe(Sn) quantum wells (QWs) is analyzed by many-body theory. Calculated absorption spectra of Ge/SiGe-QWs are in good agreement with the experiment. Also, the effect of Sn-incorporation is investigated for mid-infrared applications.
We present a new approach to realize liquid-core optical waveguides via selective wetting on lithographically patterned oleophobic and oleophilic patches for sensing and adaptable optics applications.
We present a novel software-defined radio transceiver, which takes advantages of RF photonic techniques to realize the state-of-the-art performance in the aspect of the frequency range to cover from C band to Ka band.
We demonstrate 6dB improvement in phase noise of a mode-locked semiconductor laser using coherent photon seeding, achieving a record linewidth of 29kHz. The complete photonic-circuit including the feedback cavity is integrated on a single chip.
A low-loss and fast optical switch is demonstrated on Silicon-on-Insulator. Low insertion losses (6dB), a large dynamic contrast (30dB) and a wide tuning range (6nm) are achieved with an operating electric power consumption in the milliwatt range.
We suggest and experimentally demonstrate a photonic-crystal structure with more than 30 dB difference between forward and backward transmission levels. The non-reciprocity relies on the combination of ultrafast carrier nonlinearities and spatial symmetry breaking in a Fano structure employing a single nanocavity.
We demonstrated a flexible crystalline silicon nanomembrane photonic crystal microcavity with a quality factor of 22,000 and experimentally studied its bending behavior.
We have demonstrated a quantum interface based on the frequency upconversion for photons carrying orbital angular momentum (OAM) states from telecom wavelength to visible regime by sum-frequency generation with high quantum conversion efficiency.
Strong spin-orbit interaction can be induced by light-bending metasurfaces. We show that the photon spin momentum can be directly transferred to collective motion of electrons on a conductive metasurface with this interaction.
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