We demonstrate all-optical modulation based on ultrafast optical carrier injection in a GaAs photonic crystal cavity using degenerate pump-probe technique. The observations agree well with coupled-mode model incorporating all relevant nonlinearities. low switching energy (∼120 fJ), small absorption (∼10 fast on-off response (∼15 ps), limited only by lifetime, and minimum 10 dB depth suggest practical applications at high repetition rates.

Light transmission measurements and frequency-delay reflectometry maps for GaAs photonic crystal membranes are presented analyzed, showing the transition from propagation with a well-defined group velocity to regime completely dominated by disorder-induced coherent scattering. Employing self-consistent optical scattering theory, only statistical functions describe structural disorder, we obtain excellent agreement experiments using no fitting parameters. Our theory together provide clear...

Gallium arsenide and related compound semiconductors lie at the heart of optoelectronics integrated laser technologies. Shaped micro- nanoscale, they allow strong interaction with quantum dots wells, promise stunning optically active devices. However, gallium optical structures presently exhibit lower performance than their passive counterparts based on silicon, notably in nanophotonics, where surface plays a chief role. Here, we report advanced control miniature resonators using two...

We propose a design methodology for high-$Q$ photonic crystal nanocavities with tailored radiation pattern. As an example, we applied this technique to five missing hole defect cavities and experimentally achieved sixfold improvement of the collection efficiency. This will enable high external efficiency in single-photon sources based on nanocavities.

We haves realized and measured a GaAs nanocavity in slab photonic crystal based on the design by Kuramochi et al. [Appl. Phys. Lett. 88, 041112 (2006)]. measure quality factor Q=700,000, which proves that ultrahigh Q nanocavities are also feasible GaAs. show owing to larger two-photon absorption nonlinearities appear at microwatt level will be more functional gallium arsenide than silicon nanocavities.

We demonstrate experimentally that the fiber to total insertion loss into a single-mode waveguide in suspended photonic crystal membrane can be reduced less than 10 dB (input, output, and propagation) without introducing any supplementary processing step (e.g., polymer deposition etching). This is achieved through suitable design of end-facets minimizing impedance mismatch thereby residual reflectance at ends.

We report on the observation of Anderson localization near-visible light in two-dimensional systems. Our structures consist planar waveguides which disorder is introduced by randomly placing pores with controlled diameter and density. show how to design can be observed describe both realization materials actual localized modes near-field scanning microscopy.

Abstract The typical approaches to generate heralded single photons rely on parametric processes, with the advantage of generating highly entangled states at price a random pair emission. To overcome this limit, degenerate spontaneous Four-Wave-Mixing is reliable technique which combines two pump into signal and idler via Kerr nonlinear optical effect. By exploiting intrinsic small confinement volume thermally tuning resonances 20 μ m-long Photonic Crystal cavity, we efficiently time-energy...

We have established a new material, indium gallium phosphide, lattice matched to arsenide, for two-dimensional photonic crystals at 1.55 μm. demonstrated single-mode cavities with intrinsic Q-factor larger than one million and achieved very large self-phase-modulation coefficient 1.1×103 W1 m−1 in line-defect waveguides. Importantly, the material band gap is such that two-photon absorption, Eg>2ℏω, completely suppressed this important telecommunications wavelength.

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We show that a semiconductor nanocavity where the dominant nonlinear mechanism is refractive index change induced by carriers generated through two-photon absorption can become unstable, exhibiting onset of spontaneous oscillations (self-pulsing). The linear stability analysis, validated numerical integration mean-field model, leads us to predict take place typically in 10-ps range at input power levels order 15 mW.

The dynamical properties of an InP photonic crystal nanocavity are experimentally investigated using pump-probe techniques and compared to simulations based on coupled-mode theory.Excellent agreement between experimental results is obtained when employing a rate equation model containing three time constants, that we interpret as the effects fast carrier diffusion from initially localized distribution slower surface recombination bulk recombination.The variation constants with parameters...

We demonstrate the generation of an octave-spanning supercontinuum in InGaP membrane waveguides on a silicon substrate pumped by 1550-nm femtosecond source. The broadband nature these dispersion-engineered high-index-contrast is enabled dispersive wave both sides pump as well low nonlinear losses inherent to material. also measure coherence properties output spectra close wavelength and find that highly coherent at least this range.

Single photons are of paramount importance to future quantum technologies, including communication and computation. Nonlinear photonic devices using parametric processes offer a straightforward route generating photons, however additional nonlinear may come into play interfere with these sources. Here we analyse spontaneous four-wave mixing (SFWM) sources in the presence multi-photon processes. We conduct experiments silicon gallium indium phosphide crystal waveguides which display...

We propose high index contrast InGaP photonic wires as a platform for the integration of nonlinear optical functions in telecom wavelength window. characterize linear and properties these waveguide structures. Waveguides with loss 12 dB/cm which are coupled to single mode fiber through gratings -7.5 dB coupling realized. From four wave mixing experiments, we extract real part parameter γ be 475 ± 50 W(-1)m(-1) from transmission measurements infer absence two-photon absorption measure...

We report highly efficient four wave mixing in a GaInP photonic crystal waveguide. Owing to its large bandgap, the ultrafast Kerr nonlinearity of is not diminished by two photon absorption and related carrier effects for photons 1550 nm range. A four-wave-mixing efficiency -49 dB was demonstrated cw pump probe signals milliwatt range, while pulsed pumps with peak power 25 mW conversion increased -36 dB. Measured dependencies on detuning are excellent agreement simple analytical model from...

The authors investigate the nonlinear and bistable behavior of a high-Q GaAs photonic crystal heterostructure nanocavity, side coupled to line-defect slab waveguide. observations agree well with model incorporating relevant nonlinearities. power threshold for is at least one order magnitude lower than what reported so far.

We investigate the nonlinear response of photonic crystal waveguides with suppressed two-photon absorption.A moderate decrease group velocity (∼ c/6 to c/15, a factor 2.5) results in dramatic (× 30) enhancement three-photon absorption well beyond expected scaling, ∝ 1/v 3 g .This non-trivial scaling effective coefficients from pulse compression, which further enhances optical field that purely slow-group interactions.These observations are enabled mm-long slow-light owing strong anomalous...

Solitary waves have consistently captured the imagination of scientists, ranging from fundamental breakthroughs in spectroscopy and metrology enabled by supercontinuum light, to gap solitons for dispersionless slow-light, discrete spatial lattices, amongst others. Recent progress strong-field atomic physics include impressive demonstrations attosecond pulses high-harmonic generation via photoionization free-electrons gases at extreme intensities 1014 Wcm2. Here we report first phase-resolved...

We report the realization of a silicon–germanium on silicon ring resonator with high Q-factor at mid-infrared wavelengths. The fabricated exhibits loaded 236 000 operating wavelength 4.18 µm. Considering combined waveguide propagation losses and bending losses, which are measured to be below 0.2 dB/cm, even higher Q-factors could achieved this platform. Furthermore, our dispersion engineering waveguides should make these microrings suitable for nonlinear optical applications. These results...

The authors realized an ultrahigh quality factor nanocavity in a GaAs membrane with the highest loaded Q reported to date of 250 000 side-coupled cavity-waveguide system. This result could be obtained using original aluminum-free material system combined carefully adjusted fabrication technology, yielding device small roughness and very good verticality holes as well disorder. show that intrinsic is around 3.0×105 coupled-mode model.

We investigate the nonlinear response of GaAs-based photonic crystal cavities at time scales which are much faster than typical thermal relaxation rate in devices. demonstrate a strong interplay between thermally and carrier-induced effects. have introduced dynamical model entailing two constants is very good agreement with experiments. These results will be important for crystal-based devices intended to deal practical high repetition optical signals.