Maskless femtosecond laser two-photon polymerization micromachining technology is capable of inducing triggered two-photon polymerization (2PP) to fabricate three-dimensional additive templates with structural linewidths capable of exceeding the optical diffraction limit. With the help of polymer templates, disordered structural unit nanoparticles are spontaneously assembled into ordered structures through element-to-element interactions driven by free-energy minimization. In this paper, quadrilateral and hexagonal patterned tiling polymer templates were successfully fabricated by designing and tuning the processing parameters. The nanoparticle of appropriate size arrangement corresponding to the template pattern is expected to be successful in obtaining it by directed self-assembly. At the same time, the near-field and far-field optical properties of the template area under different assembly schemes were simulated and analyzed by CST Studio Suite based on finite element analysis.
We demonstrate the creation of hybrid metal-dielectric nanostructures (NPs) using femtosecond-laser exposure of copper-silicon and gold-silicon films. The formation of arrays of nanoparticles takes place in the process of irradiation of a bilayer film along a circular trajectory. The internal structure of the obtained NPs was studied by means of transmission scanning electron microscopy and energy-dispersive X-ray spectroscopy. The resulting hybrid structures represent a mixture of gold and silicon, and both considered systems demonstrate broadband photoluminescence in the range of 450 - 900 nm with a quantum efficiency of up to 1.1%.
In this work, we numerically investigate a dielectric nanocavity composed of gallium phosphide nanocylinders. Our results demonstrate that proposed structures allow to increase the emission rate into zero phonon line of NV-center by a factor of 10. We compare properties of cavities made of crystalline silicon and gallium phosphide. Obtained parameters of the nanocavity are suitable for nanodiamonds with NV or SiV color centers and adopted for the existing lithography methods. We believe the proposed system is perspective for creation of a quantum nanophotonic chip for application in quantum telecommunication and quantum computing.
In this work we propose a simple one-step method for creation of hybrid Au/Si micro- and nanostructures with strong nonlinear response. We demonstrate that such structures depending on laser structuring parameters can produce strong enhancement of second harmonic signal compared to the initial Au/Si films or/and broadband white-light photoluminescence in the visible optical range. To explain this dependence, the studies of the fabricated structures were carried out by the Raman spectroscopy demonstrating strong correlation between phase composition of the structures and their nonlinear properties. We believe that proposed structures can be used as efficient nonlinear souses for different applications in bioimaging and nanospectroscopy.
Recently femtosecond laser has been proved to shift the resonance in the far-field and enhance the field distribution in the near field by modifying the shape of nanoparticles. Here we estimate the photoluminesence properties of hybrid oligomers integrated with nanodiamonds by examining the near-field distribution and calculating the Purcell factor in 3D orientations.
Laser-induced crystallization in the volume of plates of Foturan™ photosensitive glass (PG) at heat treatment under the
CO2-laser radiation on previously produced microdefects is considered. Processes of a crystal phase nucleation and
growth during exposure of PG plate by CO2-laser are investigated. Comparison of heat treatment conditions of PG plate
under furnace heating and when exposed to irradiation of CO2-laser is made.
In this paper laser-induced modification of photosensitive glass-ceramic materials under YAG:Nd second harmonic
picosecond pulses is observed. The method for such modification based on laser processing and subsequent heat
treatment is developed. The comparison for infrared femtosecond modification is introduced.
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