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Genuine U.S. Federal Reserve Notes have a consistent, two-component intrinsic fluorescence lifetime. We used scanning two-photon laser excitation and the time-correlated single photon counting method to identify three different types of counterfeit U.S. paper money.
The travelling-wave method was used to investigate nonlinear spatio-temporal dynamics of a tunable laser under both weak and strong external optical injection. The results suggest effective methods of controlling laser dynamics in network applications.
The magnetic and surface plasmon resonances in isotropic fishnet metamaterials with left-handed band in terahertz regime were studied experimentally and by simulation. An LC-circuit model has been adapted to describe the magnetic resonance as a function of the device geometry.
A semiconductor laser with active layer consisting of a patterned quantum dot lattice demonstrates evidence of miniband formation resulting from inter-dot coupling. Excited state lasing is thought to result from a phonon bottleneck-like effect.
Authors realized the optical switch satisfying high-speed response (<;10 nsec), polarization independent operation and low driving voltage of 3 volt by constructing a new structure on LiNbO3 substrate for the first time in the world.
We demonstrate optical carrier regeneration for wavelength reuse in a multicarrier distributed OADM network. It is possible to achieve a high-quality regenerated signal even though the employed data signal for wavelength reuse is drastically degraded.
We present a new technique to fill arbitrary patterns of a photonic crystal fiber selectively with high nonlinear liquids. Thus we can create waveguides and waveguide arrays with tailored dispersion, nonlinearity, and spatial arrangement.
Selective area growths of highly-uniform InGaN quantum dots (QDs) on dielectric nanopatterns defined by self-assembled diblock copolymer were demonstrated with ultra-high QDs density of 8×1010 cm-2, which represents the highest QDs density reported for nitride-based QDs.
Thermal dephasing due to two-photon absorption-induced linear absorption is reduced by minimizing second- and fourth-harmonic beam overlap through tight elliptical focusing perpendicular to the walk-off plane, leading to multi-watt, high-repetition rate ultraviolet generation in BBO.
We consider specific metamaterials hosting a novel extreme nonlinear regime where the linear and nonlinear dielectric responses are comparable, a regime supporting peculiar beams whose power flow direction reverses its sign along the transverse profile.
We derived an expression for the noise between the diffraction orders from a random grating. The result was applied to analyze the statistical duty-cycle error in PPLN, providing an efficient means for poling quality evaluation.
We report the two-photon absorption spectrum of single crystals of an asymmetric cyanine-like dye in comparison to its spectrum in solution. The 2PA peak magnitude is comparable to bulk semiconductors of similar absorption edge.
Ultra-high reflectivity is achieved at the end-face of a hollow-core PCF via the insertion and fusion of a metal-coated tapered single-mode-fiber to the core of the hollow fiber. Saturable absorption is demonstrated using this device.
The effect of optical feedback is investigated for a quantum-dash-based passive mode-locked laser. We observe a drastic reduction of the radio frequency spectrum linewidth even beyond the onset of coherence collapse.
Specimen-induced aberrations frequently affect image quality in high-resolution microscopes. We apply adaptive optics to correct aberrations in two-photon fluorescence, and second and third harmonic microscopes. In particular, this is applied to imaging of mouse embryos.
We demonstrate a novel line scanning multiphoton microscope with a single element detector, potentially allowing fast imaging deep into scattering tissue. Multiphoton biological imaging of ex vivo rat tendon using this technique is presented.
We have developed a novel high-resolution molecular imaging technique, Pump-Probe Optical Coherence Microscopy, based on the fusion of Pump-Probe spectroscopy and Optical Coherence Microscopy and demonstrated it on fixed human skin containing a nodular melanoma.
High-precision three-dimensional woodpile photonic crystal nanocavities with 40 × 55 × 2.25 unit cells are fabricated in GaAs wafer for 1.55 µm wavelength with the two-directional etching method in a simple two-patterning process.
Terahertz pulse generation is demonstrated by a resonant femtosecond interband excitation of the miniband of a quantum-cascade-laser. The laser gain is subsequently used to amplify the terahertz pulse generated as it propagates through the cavity.
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