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Recently, continuous-wave pumped monolithic microresonators have been examined as an alternative platform for frequency comb and ultrashort pulse generation. With a delicate balance of anomalous group velocity dispersion (GVD) and self-phase modulation, optical solitons can be formed in these microresonators and remarkable broad optical bandwidths and RF-optical stability have been demonstrated. Here...
We demonstrate a broadband Kerr frequency comb and mode-locking in a globally-normal-dispersion microresonator. A record short on-chip pulse of 74-fs is directly measured. Supported by analytical theory and numerical modeling, we describe the mode-locking mechanism.
We examine numerically and experimentally photonic band-gaps in liquid-like two dimensional photonic materials. Subwavelength dielectric rods and holes are randomly placed with Monte Carlo simulations, fabricated on silicon-on-insulator chips, and measured in near infrared wavelengths.
We studied the coexistence of optomechanical oscillation and self-pulsation in a monolithic silicon cavity. By mapping laser-cavity detuning and power, the optomechanical-to-self-pulsation transitions are observed with rich nonlinear dynamics, e.g. chaotic, mixing and synchronized regimes.
We present measurements and modeling of collimating surface states in slow-light photonic crystal superlattices consisting of alternating dispersive and homogeneous media. Superlattice periodicity allows evanescent-wave resonant coupling to surface photon bound states, supporting collimation.
We examine numerically and experimentally photonic band-gaps in liquidlike two dimensional photonic materials. Subwavelength dielectric rods are randomly placed with Monte Carlo simulations, fabricated on silicon-on-insulator chips, and measured in near infrared wavelengths.
We demonstrate the first soliton self-accelerations and frequency-shifts induced by Drude free-carrier dispersion in 1.5-mm silicon photonic crystals. Picojoule soliton center-of-mass advancement of 2-ps (about one FWHM) and wavelength blue-shift of 0.8-nm are observed via XFROG.
Absorptive optical nonlinearity is demonstrated in silicon nitride rings with ∼244,000 intrinsic quality factors. Thermal induced optical nonlinearity leads to stochastic bistable switching in the absence of free carrier dispersion, towards CMOS-compatible photonic integrated circuits.
We demonstrate the exceptionally-high third-order nonlinearity of integrated mono-layer graphene-silicon hybrid optoelectronics, enabling ultralow power resonant optical bistability, self-induced regenerative oscillations, and coherent four-wave mixing, all at few femto-joule cavity recirculating energies.
Integrated chip-scale electrodes allow isolated control of resonances and phases in optical multi-cavity system. By varying the round trip length, destructive and constructive intra-cavity interferences are observed, representing all-optical analogue to electromagnetically-induced-transparency and superradiance on-chip.
Ultra-high-Q nanocavity resonance tuning by laser-assisted thermal oxidation of silicon is demonstrated by using a 532 nm continuous wave laser. The resonance is blue-shifted by >2nm. The quality factor remains >200,000.
We present a detailed analysis of the influence of the group velocity (GV) on the dynamics of optical pulses upon their propagation in one-dimensional photonic crystal waveguides (PhCW). The theoretical model used in our analysis incorporates the linear optical properties of the PhCW (GV dispersion and optical losses), free-carrier (FC) effects (FC dispersion and FC-induced optical losses) and nonlinear...
We demonstrate tunable temporal delays in coherently-coupled multi-cavity photonic crystals, in analogue to EIT. We report deterministic control of the group delay, up to 7' the single cavity lifetime, in our CMOS-fabricated chip.
We present the integrated chip-scale tuning of multiple photonic crystal cavities. The optimized implementation allows for large tuning (20K/mW), with deterministic resonance control towards all-optical analogue to electromagnetically-induced-transparency on-chip.
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