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Journals and Conferences
We present a comprehensive theoretical study of pulsed stimulated Raman scattering in silicon wires. The pulse dynamics is described by a system of coupled equations, which describes intrinsic waveguide optical losses, phase shift and losses due to free-carriers (FCs) generated through two-photon absorption (TPA), first- and second-order frequency… (More)
An approach based on the finite-difference time-domain (FDTD) method is developed for simulating the dynamics of vertical-cavity surface-emitting lasers (VCSELs). The material response is incorporated in our FDTD algorithm by the effective semiconductor Bloch equations, and its effects are accounted for through a resonant polarization term in the Maxwell's… (More)
The dynamics of femtosecond (fs) pulse propagation in dispersion engineered silicon-on-insulator (SOI) photonic wires is investigated numerically. For fs pulses propagating in millimeter-long SOI waveguides, the interplay between nonlinear effects, group velocity dispersion (GVD), and the third-order dispersion (TOD) results in significant pulse reshaping.… (More)
We observe spectral broadening of more than 350 nm upon propagation of ultrashort pulses in a 4.7-mm-long silicon-photonic-wire waveguide. The output spectral characteristics are shown to be consistent, in part, with higher-order soliton radiative effects.
We investigate slow-light enhancement of stimulated Raman scattering in monolithic silicon photonic crystal defect waveguides. The applied Bloch-Floquet formalism demonstrates remarkable gain enhancements up to 10<sup>4</sup> at the band-edges, while considering disorder, absorption and coupling.
In this paper, we present a comprehensive theoretical description of the propagation of optical pulses in 1-D waveguides consisting of a line defect in a photonic crystal (PhC) slab waveguide made of silicon. We incorporate in our analysis linear optical effects, such as group-velocity dispersion and optical losses, as well as nonlinear effects induced by… (More)
We show that optical beams propagating in path-averaged zero-index photonic crystal superlattices can have zero phase delay. The nanofabricated superlattices consist of alternating stacks of negative index photonic crystals and positive index homogeneous dielectric media, where the phase differences corresponding to consecutive primary unit cells are… (More)
Near-IR negative index metamaterials with substantially improved optical performance are numerically demonstrated and experimentally verified. The scaling of this structure to visible wavelengths is also discussed.
1 Optical Nanostructures Laboratory, Center for Integrated Science and Engineering, Solid-State Science and Engineering, Mechanical Engineering, Columbia University, New York, NY 10027, USA 2 Quantumstone Research Inc., Taipei 114, Taiwan 3 Center for Micro/Nano Science and Technology and and Advanced Optoelectronic Technology Center, National Cheng Kung… (More)
We present the first full theoretical study of pulsed stimulated Raman scattering in silicon wires. Free carrier and two-photon absorption effects are included. Raman amplification and pulse interaction are also discussed