Deciphering single- and multi-particle trapping dynamics under femtosecond pulsed excitation with simultaneous spatial and temporal resolution

Recent theoretical and experimental studies have shed light on how optical trapping dynamics under femtosecond pulsed excitation are fine-tuned by optical and thermal nonlinearities. Here, we present experimental results of nonlinear optical trapping of single and multiple polystyrene beads (of 1 μm diameter). We show how integration and synchronization of bright-filed video microscopy with confocal detection of backscatter provide both spatial and temporal resolution required to capture intricate details of trapping dynamics. Such spatiotemporal detection is promising to have far-reaching applications in exploring controlled optical trapping and manipulations harnessed by optical and thermal nonlinearities.

Импульсный магнитный контроль толщины металлических покрытий

The research results of the characteristics of magneto-inductive thickness gauges measuring transducers using harmonic excitation currents for the case of inspecting electrically conductive coatings are presented, on the basis of which a transducing algorithm is proposed and described in detail, which involves pulsed excitation of a magnetic field and the use of the induced EMF area as a primary informative parameter when suppressing the influence of network and pulse noise, used in serial thickness gauges of metallic non-ferromagnetic coatings on ferromagnetic substrates.

Tuning optical trapping of metal-dielectric hybrid nanoparticles under ultrafast pulsed excitation: A theoretical investigation

Crucial to effective optical trapping is the ability to precisely control the nature of force/potential to be attractive or repulsive. The nature of particle being trapped is as important as...