We calculate the third order nonlinear optical response in the Hubbard model within the spin density wave (SDW) mean field ansatz in which the gap is due to onsite Coulomb repulsion. We obtain closed-form analytical results in one dimension (1D) and two dimension (2D), which show that nonlinear optical response in SDW insulators in 2D is stronger than both 3D and 1D. We also calculate the two p...

Nonlinear optics is a broad field of research and technology that encompasses subject matter in the fields of physics, chemistry, biology, and engineering. The diversity of nonlinear optics stems, in part, from the need for all-optical and electrooptical devices for applications in telecommunications, optical storage, and all-optical computing. In addition, many nonlinear optical effects have p...

For potential ultrafast optical sensor application, both VO2 thin films and nanocomposite crystal-Si enriched SiO2 thin films grown on fused quartz substrates were successfully prepared using pulsed laser deposition (PLD) and RF co-sputtering techniques. In photoluminescence (PL) measurement c-Si/SiO2 film contains nanoparticles of crystal Si exhibits strong red emission with the band maximum r...

We present an experimental and theoretical investigation into the coupling of C-O stretch vibrations of CO molecules adsorbed on Ru~001!. We employ surface infrared-visible ~IR-VIS! ~IV! and infrared-infraredvisible ~IR-IR-VIS! ~IIV! sum-frequency generation ~SFG! ~IV-SFG and IIV-SFG, respectively! to investigate the effects of the intermolecular coupling through the nonlinear optical response ...

A multidimensional, nonlinear finite-difference time-domain (NL-FDTD) simulator, which is constructed from a self-consistent solution of the full-wave vector Maxwell equations and dispersive (Lorentz), nonlinear (finitetime-response Raman and instantaneous Kerr) materials models, is used to study finite-length, corrugated, optical waveguide output couplers and beam steerers. Multiple-cycle, ult...

NONLINEAR OPTICAL PROPERTIES OF NOVEL NANOSTRUCTURED ION IMPLANTED AND LASER ABLATED SILICON USING FEMTOSECOND PULSE EXCITATION by Elaine N. Lalanne The study of the nonlinear optical properties of novel nanostructured ion implanted and laser ablation of Silicon is motivated by the need for materials that exhibit large values of the real part of the third order nonlinear susceptibility (x (3)Re...

The electronic structure and linear and nonlinear optical susceptibilities of 2-methyl-4-nitroaniline (MNA) and 2-amino-4-nitroaniline (ANA) crystals have been studied using the full potential linear augmented plane wave method within density functional theory. In addition, we have investigated the excitonic effects by means of the bootstrap exchange-correlation kernel within time dependent den...

Waveguides with low confinement loss, low chromatic dispersion, and low nonlinear effects are used in optical communication systems. Optical fibers can also be employed in such systems. Besides optical fibers, photonic crystal fibers are also highly suitable transmission media for optical communication systems. In this paper, we introduce two new designs of index-guiding photonic crystal fiber ...