Silk fibroin (SF), the primary protein in silkworm silk, has emerged as a promising organic nonlinear optical material due to its unique combination of transparency, biocompatibility, and environmental sustainability. In this study, we investigate properties SF thin films using z-scan technique with femtosecond laser pulses (35 fs, 800 nm, 1 kHz). Our results reveal strong self-defocusing effect (negative refractive index) significant multiphoton absorption, demonstrating SF's tunable...

The typical spectrally limited laser pulse in the near-infrared region is narrow-band up to 40–50 fs. Its spectral width Δk much smaller than carrying wavenumber k0 (Δk ≪ k0) . For such kinds of pulses, on distances a few diffraction lengths, Fresnel's type and their evolution can be described correctly frame well-known paraxial equation. technology established 1985 amplification through chirping pulses triggered remarkable progress optics along with construction femtosecond (fs) facilities...

The axial dependency of the central-axis value heavy particle density and temperature surface-wave plasmas is studied using Rayleigh scattering (RyS). plasma generated at a frequency 2.45 GHz in argon by surfatron operating under standard settings power 45 W, flow rate 50 sccm pressure 20 mbar. To investigate effect on gas temperature, we also investigated 6 10 mbar plasmas. By two-dimensional intensified CCD array could determine eliminate influence false stray light, major disturbing...

We report on a new approach toward laser-assisted modification of biocompatible polydimethylsiloxane (PDMS) elastomers relevant to the fabrication stretchable multielectrode arrays (MEAs) devices for neural interfacing technologies. These applications require high-density electrode packaging provide high-resolution integrating system stimulation and/or recording. Medical grade PDMS are highly flexible with low Young’s modulus < 1 MPa, which similar soft tissue (nerve, brain, muscles)...

An impressive phenomenon of observed plasma instability and conical emission under the propagation ultrashort laser pulses in air is reported. The discussed novel findings demonstrating nonlinear effects are incapable to be explained standard spatiotemporal paraxial optics. Three main mechanisms investigated. first one related nonparaxial for waveguiding femtosecond pulses, second considers mechanism single filament formation at weak ionization. third demonstrates a new physical effect...

We present a novel method to construct particle accelerators targeting light atoms and nuclei using high-power femtosecond laser pulses. Initially, we confine within the pulse envelope due longitudinal polarization forces, allowing them acquire kinetic energies of several GeV. Subsequently, an external electric field separates at cathode, concentrating helium in small area. The energy 1.88 GeV impacts, exceeding alpha binding (28 MeV) by two orders magnitude, induces powerful gamma radiation...

The use of laser processing for the creation diverse morphological patterns onto surface polymer scaffolds represents a method overcoming bacterial biofilm formation and inducing enhanced cellular dynamics. We have investigated influence ultra-short parameters on 3D-printed poly-ε-caprolactone (PCL) poly-ε-caprolactone/hydroxyapatite (PCL/HA) with aim creating submicron geometrical features to improve matrix biocompatibility properties. Specifically, present research was focused monitoring...

The ultra-short optical pulses can be used for the confinement of neutral particles by an additional longitudinal force, connected with Poynting vector and influence magnetic field on their polarizability. is also to intensity electromagnetic field. On other hand, a laser pulse manipulated lens, thus, indirectly, force increased or decreased its direction changed. This in turn enables unique possibility compression atoms, molecules, into focus lens. Here, we reported experimental study...

We present results on laser-induced color changes in gold- and silver-doped glass. The doped borosilicate glass was prepared by conventional melt quenching. study focused the change of optical properties after irradiation femtosecond laser pulses. Under certain conditions, radiation induces defects associated with formation centers material. studied this process a broad range wavelengths – from UV to IR, observed irradiated areas annealing processed samples, being red for gold-doped yellow...

Abstract The paper presents results on femtosecond laser irradiation-induced modification of the optical properties a composite material – gold nanoparticles embedded into borosilicate glass host. process is initiated by pulses delivered Ti:sapphire system with pulse duration 35 fs. samples are prepared melt quenching added as hydrogen tetrachloroaurate (III) hydrate to initial composition. Post-fabrication annealing leads homogeneous formation in glass; varying parameters producing...

Three - dimensional poly (e- caprolactone) (PCL) scaffolds as suitable biocompatible material for manufacturing tissue replacements are utilized engineering purposes. The porous structures fabricated by rapid prototyping method (Bioscaffolder) based on hypodermic dispensing process. consecution of experiments demonstrated the possibility creation surface micro formations, applying different laser fluences, at 1 kHz repetition rate fixed time exposure sec 800 nm central wavelength....

The study investigates the effect of femtosecond laser pulse irradiation on modification and activation effects medical-grade polydimethylsiloxane (PDMS) polymer. motivation research is based continuous interest variety applications PDMS material in medicine implantable neural interface devices. preferred due to its exceptional properties such as high biocompatibility biostability, mechanical flexibility stability, optical transparency from UV near IR spectral region, cost-effectiveness....

The current work is a case study of ongoing in-depth extensive fundamental research on the plasma formation and relaxation dynamics in transparent media induced by mid- short-wavelength infrared laser pulses. experimental investigation performed 35 fs-laser system setup. working parameters such as energy number pulses are varied. measurements applied borosilicate glass samples doped with gold nanoparticles. effects their consequence laser-induced ablation damage thresholds investigated...

Abstract Our research was motivated by the specific properties of noble-metal nanoparticles and their wide applications. The resonance frequency for nanostructures is in near-UV visible spectral ranges, where most commercially-available lasers oscillate. This makes these materials attractive candidates studying view efficient We investigated filaments formation Au-ion-doped glass materials, transparent range, during irradiation femtosecond laser pulses. Second harmonic generation media...

Abstract The present research aims to investigate the modification and activation effects on medical-grade polydimethylsiloxane (PDMS) polymer irradiated by ultrashort laser pulses. motivation of current study is based wide use PDMS material in medicine and, more specifically, implantable neural interface applications. Systematic measurements are carried out characterize effect beam parameters optical absorption surface morphology with respect laser-treated zones. modified tracks after...

Abstract The last several years witnessed increasingly rapid advances in applying biopolymers tissue engineering for the purposes of regenerative medicine. growing demand preparing materials with desired physical, biological and mechanical properties requires active investigations field engineering. Among wide variety biopolymers, chitosan proved to be an outstanding material due its properties, such as biocompatibility, biodegradability a range available fabrication technologies. present...