Strong light localization inside the nanoscale gaps provides remarkable opportunities for creation of various medical and biosensing platforms stimulating an active search inexpensive easily scalable fabrication at a sub-100 nm resolution. In this paper, self-organized laser-induced periodic surface structures (LIPSSs) with shortest ever reported periodicity 70 ± 10 were directly imprinted on crystalline Si wafer upon its direct femtosecond-laser ablation in isopropanol. Appearance such...

Long-term stability in contact with water of organosilane layers formed by octadecyltrimethoxysilane (ODTMS) on polished aluminum alloy (AA2024) through dip-coating was studied combining SEM, angle measurements, and X-ray photoelectron spectroscopy. Similar were AA2024 coated permanganate conversion coating, 1,2-bis(triethoxysilyl)ethane (BTSE) hydrated SiOx as under-layers, after which their long-term durability also tested. During immersion for about one month, all the samples exhibited a...

Abstract Upon systematic studies of femtosecond‐laser processing monocrystalline Si in oxidation‐preventing methanol, it is shown that the electromagnetic processes dominating at initial steps progressive morphology evolution define onset hydrodynamic and upon subsequent multi‐pulse exposure. Under promoted exposure quasi‐regular subwavelength laser‐induced periodic surface structures (LIPSSs) are justified to evolve through template‐assisted development Rayleigh‐Plateau instability molten...

The rational combination of plasmonic and all-dielectric concepts within hybrid nanomaterials provides a promising route toward devices with ultimate performance extended modalities. Spectral matching Mie-type resonances for such nanostructures can only be achieved their dissimilar characteristic sizes, thus making the resulting nanostructure geometry complex practical realization large-scale replication. Here, we produced amorphous TiO2 nanospheres decorated doped Au nanoclusters via...

Recent progress in hybrid optical nanomaterials composed of dissimilar constituents permitted an improvement the performance and functionality novel devices developed for optoelectronics, catalysis, medical diagnostics, sensing. However, rational combination contrasting materials such as noble metals semiconductors within individual nanostructures via a ready-to-use lithography-free fabrication approach is still challenge. Here, we report on two-step synthesis Au-Si microspheres generated by...

Hybrid nanoparticles (NPs) with complex morphology, structure, and chemical composition are considered key building blocks of next-generation optoelectronic devices, catalysts, sensitizers/agents for diverse biomedical applications. Laser ablation in liquid (LAL) has emerged as a promising route to design produce unique nanocomposite NPs, yet control over the product's size structure is limited by tuning laser parameters or content surrounding liquid. In this paper, based on example porous...

The fabrication method of the high-quality fiber microaxicons (FMAs) on endface optical was developed. Using several types commercially available fibers we experimentally demonstrated a FMA focusing laser beam into tiny spot with FWHM≈0.6λ and Bessel-like field distribution. It also that choosing appropriate chemical composition etching solution makes it possible to change shape tip from conical hemispherical. This allows one spatial distribution output beam, which can represent both depth...

Abstract Simple high-performance, two-stage hybrid technique was developed for fabrication of different plasmonic nanostructures, including nanorods, nanorings, as well more complex structures on glass substrates. In this technique, a thin noble-metal film dielectric substrate is irradiated by single tightly focused nanosecond laser pulse and then the modified region slowly polished an accelerated argon ion (Ar + ) beam. As result, each locally modifies initial metal through initiation fast...

We report on high-quality infrared (IR)-resonant plasmonic nanoantenna arrays fabricated a thin gold film by tightly focused femtosecond (fs) laser pulses coming at submegahertz repetition rates printing rate of 10 million elements per second. To achieve this, the were spatially multiplexed fused silica diffractive optical into 51 identical submicrometer-sized spots arranged linear array periodicity down to 1 μm. The demonstrated high-throughput nanopatterning modality indicates fs maskless...

Abstract Interaction of complex-shaped light fields with specially designed plasmonic nanostructures gives rise to various intriguing optical phenomena like nanofocusing surface waves, enhanced nonlinear response and appearance specific low-loss modes, which can not be excited ordinary Gaussian-shaped beams. Related are commonly fabricated using rather expensive time-consuming electron- ion-beam lithography techniques limiting real-life applicability such an approach. In this respect,...

Since the second half of 20th century, ideas to develop methods for formation optical vortices (OVs) or OV beams Ð regions circular motion energy flow in an electromagnetic wave around so-called phase singularity points have become widespread.Such are unique because special spiral shape front, endowing them with orbital angular momentum (OAM) that can be transferred matter and cause rotation nano-and micro-objects.Presently, actively used solve both applied fundamental problems optics...

Abstract Ultrashort laser pulses deliver electromagnetic energy to matter causing its localized heating that can be used for both material removal via ablation/evaporation and driving interface chemical reactions. Here, it is shown mentioned processes simultaneously combined within straightforward nanotexturing of Si wafer in a functionalizing solution produce practically relevant metal–semiconductor surface nano‐morphology. Such unique hybrid morphology represents deep‐subwavelength...

The preparation method can considerably affect the structural, morphological, and gas-sensing properties of mixed-oxide materials which often demonstrate superior photocatalytic sensing performance in comparison with single-metal oxides. In this work, hybrids semiconductor nanomaterials based on TiO2 ZnO were prepared by laser ablation Zn Ti plates water then tested as chemiresistive gas sensors towards volatile organics (2-propanol, acetaldehyde, ethanol, methanol) ammonia. An infrared...

In this paper, we experimentally demonstrate simultaneous wavelength and orbital angular momentum (OAM) multiplexing/demultiplexing of 10 Gbit/s data streams using a new on-chip micro-component-tunable MEMS-based Fabry-Perot filter integrated with spiral phase plate. the experiment, two wavelengths, each them carrying channels zero nonzero OAMs, form four independent information channels. case spacing between 0.8 nm intensity modulation, power penalties relative to transmission one channel...

Combination of dissimilar materials such as noble metals and common semiconductors within unified nanomaterials holds promise for optoelectronics, catalysis optical sensing. Meanwhile, difficulty obtaining hybrid using lithography-based techniques stimulates an active search advanced, inexpensive, straightforward fabrication methods. Here, we report one-pot one-step synthesis Ag-decorated Si microspheres via nanosecond laser ablation monocrystalline silicon in isopropanol containing AgNO3....

We study structural and morphological transformations caused by multipulse femtosecond-laser exposure of Bridgman-grown ϵ-phase GaSe crystals, a van der Waals semiconductor promising for nonlinear optics optoelectronics. unveil, the first time, laser-driven self-organization regimes in allowing formation regular laser-induced periodic surface structures (LIPSSs) that originate from interference incident radiation interface plasmon waves. LIPSSs causes transformation near-surface layer to...

We present a novel optical element - fiber microaxicon (FMA) for laser radiation focusing into diffraction-limited spot with Bessel-like profile as well precision nanostructuring of metal film surfaces. Using the developed FMA single-pulse irradiation Au/Pd films on quartz substrate we have demonstrated formation submicron hollow microbumps small spike atop spherical nanoparticles. Experimental conditions controllable and reproducible ordered arrays such microstructures were defined. The...

Here, we present the single-step laser-assisted fabrication of anti-reflective hierarchical surface textures on silicon locally functionalized with a photoluminescent (PL) molecular nanolayer. Using femtosecond-laser ablation commercial crystalline Si wafers placed under layer solution containing rhodamine 6G (R6G) triethoxysilyl derivative, fabricated ordered arrays microconical protrusions self-organized nanoscale morphology. At same time, laser-induced temperature increase facilitated...

Here, we show that direct femtosecond laser nanostructuring of monocrystalline Si wafers in aqueous solutions containing noble-metal precursors (such as palladium dichloride, potassium hexachloroplatinate, and silver nitrate) allows for the creation nanogratings decorated with mono- (Pd, Pt, Ag) bimetallic (Pd-Pt) nanoparticles (NPs). Multi-pulse femtosecond-laser exposure was found to drive periodically modulated ablation surface, while simultaneous thermal-induced reduction...

As the size of state-of-the-art optical devices shrinks to nanoscale, need for tools allowing mapping local properties at deep sub-diffraction resolution increases. Here we demonstrate successful variations refractive index a smooth dielectric surface by detecting spectral response single spherical-shape Ag nanoparticle optically aligned with supporting fiber axicon microlens. We propose and examine various excitation schemes plasmonic nanoantenna provide efficient interaction its dipolar...