19,508 research outputs found
Nd-doped polymer waveguide amplifiers
Nd3+-complex-doped polymer channel waveguide amplifiers with various lengths and Nd3+ concentrations are fabricated by a simple procedure. Internal net gain at 840–950 nm and 1064 nm is experimentally and theoretically investigated under continuous-wave excitation at 800 nm. Internal net gain in the range 865–930 nm is observed and a peak gain of 2.8 dB at 873 nm is obtained in a 1.9-cm-long waveguide with a Nd3+ concentration of 0.6x10e20 cm-3 at a launched pump power of 25 mW. The small-signal gain measured in a 1-cm-long sample with a Nd3+ concentration of 1.03x10e20 cm-3 is 2.0 dB/cm and 5.7 dB/cm at 873 nm and 1064 nm, respectively. By use of a rate-equation model, the internal net gain at these two wavelengths is calculated and the macroscopic parameter of energy-transfer upconversion as a function of Nd3+ concentration is derived. Ease of fabrication, compatibility with other materials, and low cost make such rare-earth-ion-doped polymer waveguide amplifiers suitable for providing gain in many integrated optical devices
Light scattering spectra of supercooled molecular liquids
The light scattering spectra of molecular liquids are derived within a
generalized hydrodynamics. The wave vector and scattering angle dependences are
given in the most general case and the change of the spectral features from
liquid to solidlike is discussed without phenomenological model assumptions for
(general) dielectric systems without long-ranged order. Exact microscopic
expressions are derived for the frequency-dependent transport kernels,
generalized thermodynamic derivatives and the background spectra.Comment: 12 page
Laser diagnostics and minor species detection in combustion using resonant four-wave mixing
Peer reviewedPostprin
Detecting Molecular Rotational Dynamics Complementing the Low-Frequency Terahertz Vibrations in a Zirconium-Based Metal-Organic Framework
We show clear experimental evidence of co-operative terahertz (THz) dynamics
observed below 3 THz (~100 cm-1), for a low-symmetry Zr-based metal-organic
framework (MOF) structure, termed MIL-140A [ZrO(O2C-C6H4-CO2)]. Utilizing a
combination of high-resolution inelastic neutron scattering and synchrotron
radiation far-infrared spectroscopy, we measured low-energy vibrations
originating from the hindered rotations of organic linkers, whose energy
barriers and detailed dynamics have been elucidated via ab initio density
functional theory (DFT) calculations. For completeness, we obtained Raman
spectra and characterized the alterations to the complex pore architecture
caused by the THz rotations. We discovered an array of soft modes with
trampoline-like motions, which could potentially be the source of anomalous
mechanical phenomena, such as negative linear compressibility and negative
thermal expansion. Our results also demonstrate coordinated shear dynamics
(~2.5 THz), a mechanism which we have shown to destabilize MOF crystals, in the
exact crystallographic direction of the minimum shear modulus (Gmin).Comment: 10 pages, 6 figure
Phonon anharmonicity of rutile TiO_2 studied by Raman spectrometry and molecular dynamics simulations
Raman spectra of rutile titanium dioxide (TiO_2) were measured at temperatures from 100 to 1150 K. Each Raman mode showed unique changes with temperature. Beyond the volume-dependent quasiharmonicity, the explicit anharmonicity was large. A new method was developed to fit the thermal broadenings and shifts of Raman peaks with a full calculation of the kinematics of three-phonon and four-phonon processes, allowing the cubic and quartic components of the anharmonicity to be identified for each Raman mode. A dominant role of phonon-phonon kinematics on phonon shifts and broadenings is reported. Force-field molecular dynamics calculations with the Fourier-transformed velocity autocorrelation method were also used to perform a quantitative study of anharmonic effects, successfully accounting for the anomalous phonon anharmonicity of the B_1_(g) mode
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