A simple interferometric method is described to measure the time-dependent deformation of piezoelectric bimorphs driven by ac voltage. Applying this method to a bimorph assembly used to measure viscoelastic forces in a surface forces apparatus, we find that a sinusoidal-shaped harmonic drive voltage generates sinusoidal deformation but that a triangular-shaped harmonic drive voltage fails to pr...

We consider the energy flow between a classical one-dimensional harmonic oscillator and a set of N two-dimensional chaotic oscillators, which represents the finite environment. Using linear response theory we obtain an analytical effective equation for the system harmonic oscillator, which includes a frequency dependent dissipation, a shift, and memory effects. The damping rate is expressed in ...

Third harmonic generation (THG) imaging using a near-field scanning optical microscope (NSOM) is demonstrated for the first time. A femtosecond, tunable near-infrared laser was used to generate both nonresonant and resonantly enhanced third harmonic radiation in human red blood cells. We show that resonantly enhanced THG is a chemically specific bulk probe in NSOM imaging by tuning the excitati...

We present the first study of nonlinear optical third-harmonic generation (THG) in the strongly correlated charge-transfer insulator Sr(2)CuO(2)Cl(2). For fundamental excitation in the near infrared, the THG spectrum reveals a strongly resonant response for photon energies near 0.7 eV. Polarization analysis reveals this novel resonance to be only partially accounted for by three-photon excitati...

The wave-energy excitation of point absorbers is highly associated with their resonant movement, and harmonic characteristics are increasing concern in affecting resonance. However, the commonly used linearized power take-off (PTO) systems underestimate impact harmonics. purpose this study to address knowledge gap assessing contribution hydraulic PTO higher wave loads velocities. In present wor...

Due to a rising share of power electronic devices in networks and the consequent rise harmonic distortion, impedance resonances are an important issue. Nowadays, frequency scan method is used for resonance phenomena identification analysis. The main disadvantage its inability decouple different phenomena. This means that also unable provide sufficient information about effects parameters networ...

The studies of the high-order harmonics generated in Se-containing plasmas are reported. ablation selenium a vacuum allowed for formation plasma demonstrating generation and resonance enhancement harmonic at shortest wavelength reported so far (λ ≈ 22.9 nm, Eph 54.14 eV). This corresponds to 35th order 800-nm-class lasers. influence presence molecular state (ZnSe HgSe) on suppression effect dur...