Near-threshold femtosecond laser fabrication of one-dimensional subwavelength nanogratings on a graphite surface

Superimposed one-dimensional quasiperiodic gratings with multiple periods Λ≈110–800 nm well below or comparable to the pump laser wavelength of 744 nm, and ridge orientations perpendicular to the linear polarization of infrared femtosecond laser pulses, were fabricated after multiple near-threshold laser shots on a planar surface of quasimonocrystalline graphite in ambient airyesBelgorod State Universit

Enhancement of ultrafast electron photoemission from metallic nano antennas excited by a femtosecond laser pulse

We have demonstrated for the first time that an array of nanoantennas (central nanotips inside sub-micron pits) on an aluminum surface, fabricated using a specific double-pulse femtosecond laser irradiation scheme, results in a 28-fold enhancement of the non-linear (three-photon) electron photoemission yield, driven by a third intense IR femtosecond laser pulse. The supporting numerical electrodynamic modeling indicates that the electron emission is increased not owing to a larger effective aluminum surface, but due to instant local electromagnetic field enhancement near the nanoantenna, contributed by both the tip's lightning rod effect and the focusing effect of the pit as a microreflector and annular edge as a plasmonic lens.Comment: 4 pages, 3 figure

Femtosecond laser modification of titanium surfaces: direct imprinting of hydroxylapatite nanopowder and wettability tuning via surface microstructuring

Femtosecond laser modification of titanium surfaces was performed to produce microstructured hydrophilic and biocompatible surface layers. Biocompatible nano/microcoatings were prepared for the first time by dry femtosecond laser imprinting of hydroxylapatite nano/micropowder onto VT6 titanium surfacesyesBelgorod State Universit

АНАЛІТИЧНЕ ПІДГРУНТЯ ЗАБЕЗПЕЧЕННЯ ФІНАНСОВОЇ БЕЗПЕКИ СУБ’ЄКТІВ ГОСПОДАРЮВАННЯ (ANALYTICAL BASIS OF ECONOMIC AGENTS FINANCIAL SECURITY ENSURING)

У статті розглянуті питання аналітичного підґрунтя забезпечення фінансової безпеки суб’єктів господарювання на основі якісних і кількісних параметрів їх фінансового стану, які повинні сигналізувати про можливі загрози існуванню підприємства, відповідно й приймати обґрунтовані управлінські рішення попереджувального характеру. (The article discusses the analytical financial security of business entities on the basis of qualitative and quantitative parameters of their financial situation, which should signal the possible threats to the existence of the company that you can make informed management decisions preventive nature.

Femtosecond laser nanostructuring of metals: sub100-nm one-dimensional surface gratings

One-dimensional quasi-periodic structures whose period is much smaller than the wavelength of exciting optical radiation have been obtained on a titanium surface under the multi-shot action of linearly polarized femtosecond laser radiation at various surface energy densitiesyesBelgorod State Universit

Evolution of black silicon nano- and micro-scale surface topologies upon femtosecond laser irradiation

Gradual evolution of silicon surface topology from one-dimensional to two-dimensional nanogratings and then to isotropic sets of nanospikes was observed by increasing IR and UV femtosecond laser irradiation dose (the variable number of incident laser pulses at the constant laser fluence). The fundamental mechanisms of these topological transformations are discussedyesBelgorod State Universit