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We experimentally observed the self-distortion of picosecond pulses propagating in silicon wire waveguides. The asymmetry of output pulse shape was due to two-photon absorption generated free carriers within the pulse duration.
We demonstrate resonant guiding in a chalcogenide glass photonic crystal membrane associated with Fano coupling between free space and guided modes. We obtain good agreement with modeling results based on three-dimensional finite-difference time-domain simulations.
We use two-photon absorption polymerization to fabricate optically active microstructures that exhibit optically-induced birefringence and dichroism. Our results open the door to new applications in data storage, waveguides and optical circuitry.
We realized, for the first time, NOLM-type all optical switching with carbon nanotubes loaded planar waveguide. ~20% splitting ratio contrast has been achieved using just 1 cm-long carbon nanotubes loaded planar waveguide.
Directional ultraviolet lasing at room temperature in 3D ZnO photonic crystals is reported. Comparison of measured optical properties with the calculated band structures shows that lasing occurs due to slow-propagating modes in high-order photonic bands.
Bragg stacks were simply fabricated from evaporated gold and spin-coated polymer layers. High reflectivity occurs for only a few bilayers; compared to single gold films nonlinear absorption is enhanced by ~7x near a Bragg resonance.
Intensity dependence of OPO performance was measured to investigate uniformity in thick QPM PPMgSLT fabricated by use of single- and multi-pulse methods. A large effective aperture (fluctuation<10%) of 1.4times1.3 mm2 may be obtained in the both types of devices.
The effects of a sub-wavelength transition layer of negative index material on surface wave propagation are investigated. Dispersion relations at interfaces of linear and nonlinear dielectrics separated by this transition layer are derived and analyzed.
We report cavity-enhanced second-harmonic generation from a tightly confining non-linear optical device for optical frequency conversion, which employs a novel waveguide-embedded dichroic mirror, highly reflective at the fundamental wavelength and transmissive at the second harmonic.
An ultrabroad infrared continuum can be produced using optical parametric generation (OPG) in quasi-phasematched GaAs. Spectra over an octave wide, spanning 4.5 to 10.7 microns, measured 20 dB down from the peak, have been observed.
The conversion efficiency of nonlinear crystals is increased by shaping the intensity distribution of the laser beam. A diffractive optic to shape the Gaussian input beam into a top-hat intensity profile was fabricated and tested.
This study shows the optical properties of a vertical cavity laser(VCL) - depleted optical thyristor(DOT) fabricated using selective oxidation. The oxide confined PnpN VCL-DOT clearly shows the nonlinear s-shaped current-voltage and lasing characteristics.
We measured the two-photon absorption cross-section of Lucirin TPO-L and fabricated complex microstructures using it in acrylate resin. Using quantum chemistry calculations, we relate the nonlinear optical properties of the photoinitiator to its molecular structure.
We demonstrated a novel two-dimensional photonic-crystal based Symmetric Mach Zehnder type all-optical switch (PC-SMZ) with InAs quantum dots acting as a nonlinear phase-shift source. The 600-mum-long PC-SMZ exhibited a 15-ps-wide switching-window at sufficiently low optical-energy of ~100 fJ.
Micromechanical resonators incorporating waveguide Fabry-Perot cavities are designed and losses affecting optical finesse are studied. A doubling of the effective Q-factor in a coupledoptical-mechanical resonator is obtained, enabling high-resolution resonant sensors with optical readout.
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