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We demonstrate near-field radiative heat transfer between nanostructures and show that it dominates over other on-chip conduction channels. The measured heat transfer behavior matches the predictions of boundary element method simulations for parallel nanobeams.
We demonstrate optical pulse compression by using two slow light in Si photonic crystal waveguide. Enhanced nonlinearity by slow light and tunable dispersion by integrated heaters achieved the compression from 8.6 to 2.6 ps.
We construct an ultrafast biphoton correlator with a record pair conversion efficiency of 10−5 based on sum-frequency generation in a PPLN waveguide, enabling us to demonstrate high-order dispersion cancellation for the first time.
A terahertz leaky-wave antenna was implemented using the TE1 mode of a parallel-plate waveguide with a plate separation of 4 mm. Peak frequencies of leaky wave radiation are shown to be consistent with predicted values.
Self-defocusing soliton compression supported by the cascaded phase-mismatched second-harmonic generation process is numerically demonstrated in unpoled lithium niobate ridge waveguides where nano-joule pulses are operated and quasi-phase-matching is unnecessary. The soliton range is 1100–1800 nm.
A dispersion-flattened microresonator based on slot waveguide exhibits great performance improvement of Kerr frequency combs by engineering the 2nd-order dispersion amount and anomalous-dispersion bandwidth with all-order dispersion taken into account.
We investigate experimentally and theoretically the role of higher-order-dispersion on the bandwidth of microresonator-based parametric frequency combs. Our results demonstrate that fourth-order dispersion plays a critical role in determining the spectral bandwidth.
Difference frequency generation in monolithic semiconductor waveguides using χ(2) nonlinearities produced mid IR radiation between 7700 – 8300 nm in a single waveguide element via 20 nm tuning of a 1550 nm fiber laser pump.
We report time-domain measurements of nonlinear dynamics of picosecond pulses in silicon. The dispersion-engineered photonic crystal enables our systematic investigation of dynamic interplay between dispersion, free-carriers, and χ(3) effects for a broad parameter range.
We demonstrate femtosecond supercontinuum generation in a silicon waveguide. Despite the strong nonlinear absorption inherent to silicon at telecom wavelengths, we experimentally demonstrate that the compression and subsequent splitting of higher order solitons remains possible.
The simultaneous generation of second and third order dispersion is demonstrated using nonlinearly chirped silicon waveguide gratings. Second order dispersion of −2.3×106 ps/nm/km and third order dispersion of 1.2×105 ps/nm2/km were demonstrated at 1.55µm.
We propose, model and experimentally characterize a novel class of terahertz hollow-core tube waveguides with high-loss cladding material, resulting in propagation with low loss, low dispersion, and high useful bandwidth.
We show wavelength conversion in a compact Si3N4 waveguide. Combining low loss, long length, relatively large nonlinear coefficient, high-power handling and absence of two-photon absorption, this platform is promising for integrated nonlinear optics applications.
We show that a Lieb photonic lattice of helical waveguides (without any external field) has one-way edge states that are topologically protected against backscattering as they pass through defects or around corners.
We investigate theoretically parametric frequency comb generation in silicon microresonators for telecom and mid-infrared (MIR) wavelengths in the presence of multiphoton absorption. Parametric oscillation is inhibited at telecom wavelengths but can occur at MIR wavelengths.
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