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We analyzed the enhancement of the forward Brillouin gain in a silicon slot waveguide. The calculations predict a gain of 3.6 × 105 W−1m−1, which is an order of magnitude larger than in a silicon wire.
Single mode anomalous dispersion As2S3 on Er doped TeO2 waveguides with near zero propagation loss under 1475nm pumping are demonstrated. Fully lossless waveguides with high nonlinear coefficient can be achieved with higher 1480nm pump power.
The optical nonlinearities of the chalcogenide Ge28Sb12Se60 are studied using the z-scan technique with femtosecond and picosecond laser pulses at 1.0 μm. Results indicate this glass shows promise for nonlinear optical waveguide devices.
Evanescent-coupling-induced group velocity dispersion (GVD) in a subwavelength silicon directional coupler is observed to significantly modify four-wave-mixing (FWM) spectra. As the separation between two silicon wires decreases, the increasing dispersion gradually suppresses the FWM gain.
Improvement of resolution beyond the Rayleigh limit is obtained by monitoring non-resonant four wave mixing generated by the target in a confocal scanning microscope configuration.
In cavity-enhanced OPCPA, nonlinear phase shifts imparted on the intracavity pump pulse limit pump power loading and degrade system performance. We show that cavity-locking offsets these effects, maintaining dramatic bandwidth extension and high conversion efficiency.
A cw triple-wavelength selectable Nd:GdVO4 laser was demonstrated. When switching the dc voltages and applying 25 W pump power, the output wavelength can be selected among 912, 1063, and 1342 nm with watt-level output power.
We have achieved the lowest propagation loss of 1.3 dB/cm in a quasi-phase-matched GaAs/AlGaAs waveguide by optimizing MBE growth temperature. An expected normalized conversion efficiency of the waveguide will exceed that of a PPLN waveguide.
We measure the polarization evolution of ultrashort pulses (filaments) propagating in air for various pulse widths and energies. We observe the change of light ellipticity close to circular polarization.
We investigate cavity length detuning in a picosecond synchronously pumped optical parametric oscillator based on an aperiodically poled nonlinear crystal. A strong dependence on the sign of the quasi-phase matching period chirp is observed.
By coating a layer of polydimethylsiloxane (PDMS) on the silica microcavity surface, we observe the Raman laser emission from PDMS, which is to our knowledge the first demonstration of polymer cavity Raman laser.
An optofluidic liquid jet waveguide used for natural fluorescence spectroscopy is reported. Experimental measurements have been performed on water solutions containing organic compounds showing low detection limit.
We present work looking at the two-photon optical characterization of water soluble chemical probes based on surfactant nanomicelles encapsulation and ormosil PEBBLEs as well as in-vitro two-photon imaging of oxygen and hydrogen sulfide.
By leveraging the polarization-dependence of the Bloch-surface-wave-induced giant Goos-Hanchen shift, a novel polarization-modulation-based GH sensing scheme is demonstrated, which can suppress the common mode drift in the setup to ensure better system stability.
We report for the first time an alternative way to detect the mode splitting in a silica microcavity through measuring the heterodyne beat note signal of a Raman laser mode.
A microscopic theory of plasmon-enhanced metal photoluminescence is developed. New mechanism of luminescence suppression in small nanostructures is identified: excitation of Auger plasmons by core holes. Our numerical calculations are in excellent agreement with experiment.
Conventional 2D plasmonic structures, with surface coverage ∼50%, provide field enhancement in the plane. The proposed 3D nanoplasmonic surfaces, with unity coverage, achieve 7.2-fold stronger out-of-plane enhancement compared to the 2D counterparts.
We rigorously determine the effect of parasitic loss on the achievable absorption enhancement in nanophotonic, plasmonic light trapping schemes. We show that, even in the presence of parasitic loss, opportunities exist to exceed conventional limits.
We report a unique design of a Raman silicon laser using a photonic crystal high-Q nanocavity without the reverse-biased p-i-n diode, which leads to the continuous-wave lasing operation with ultralow threshold power of ∼1 μW.
We investigate-light trapping in thin-film crystalline silicon solar cells with rough interfaces and engineered disordered photonic structures. The general aspects of the optical properties are discussed, demonstrating broad band absorption close to the Lambertian limit.
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