Metalenses offer the ground-breaking opportunity to realize highly performing low-weight, flat and ultrathin, optical elements which substantially reduce size complexity of imaging systems. Today, a major challenge in metalenses design is still realization achromatic ideally focussing broad wavelength spectrum at single focal length. Here we present fast effective way fabricate extremely thin all-dielectric metalenses, optimally solving achromaticity issues by means machine learning codes....

Innovative goods authentication strategies are of fundamental importance considering the increasing counterfeiting levels. Such a task has been effectively addressed with so-called physical unclonable functions (PUFs), being properties system that characterize it univocally. PUFs commonly implemented by exploiting naturally occurring non-idealities in clean-room fabrication processes. The broad availability classic paradigm PUFs, however, makes them vulnerable. Here, we propose hybrid...

Abstract Effective optical elements with tailored properties often rely on the capability to tune material's structure at nanoscale. Thanks their self‐organized 1D helical arrangement, cholesteric liquid crystals represent a beautiful example of materials whose are governed by supramolecular structure. According Bragg's law, selective reflection circular polarized light occurs for wavelengths within photonic band gap, which, beside refractive indices, depends helix pitch. Here, polymeric...

This work investigates the heat delivered by a mono-layer 1D grating of gold nanoparticles (GNPs) created photo-reduction through two-photon direct laser writing (2P-DLW) in poly-vinyl alcohol (PVA) matrix doped with HAuCl4, under resonant radiation. We drop cast film PVA + HAuCl4 mixture onto glass substrate, which we create gratings 1 mm2 made stripes GNPs characterized high polydispersivity. demonstrate that, controlling pitch GNP stripes, obtain different values photo-induced temperature...

The influence of ultra-short laser modification on the surface morphology and possible chemical alteration poly-lactic acid (PLA) matrix in respect to optimization cellular antibacterial behavior were investigated this study. Scanning electron microscopy (SEM) morphological examination processed PLA showed formation diverse hierarchical microstructures, generated by irradiation with a range fluences (F) scanning velocities (V) values. By controlling parameters, roughness can be achieved,...

Plasmonic metasurfaces with spatial symmetry breaking are crucial materials significant applications in fields such as polarization-controlled photonic devices and nanophotonic platforms for chiral sensing. In this paper, we introduce planar plasmonic metasurfaces, less than one-tenth of a wavelength thick, featuring nanocavities formed by three equilateral triangles. This configuration creates uniform, thin metasurfaces. Through combination experimental measurements numerical modeling,...

Abstract Tricalcium phosphate (Ca 3 (PO 4 ) 2 , TCP), is one of the most studied and used as material for bioresorbable implants. The β phase has a slower dissolution dynamic ensures mechanical support longer time in biological environment, while faster release ions characterize α that trigger stronger response. In this work femtosecond laser system was to process β-TCP pellets surface. processing results surface morphology modification, by turning flat mirror polished into rough opaque one....

An equation was inadvertently omitted from the sentence beginning on line 13 of section 2 (Tuning Cholesteric Bragg Reflection by Direct Laser Writing).The should read as follows:In CRMs, director is not uniform, because molecules spontaneously self-assemble into a helical superstructure (Figure 1a) which grants circular-polarization selective reflection at normal incidence in wavelength range centered = np, where n average refractive index and p helix pitch.

Reconstruction of bone tissue defects is a problematic area the modern world. Temporary “platforms” various materials for improving cell adhesion and proliferation have been extensively researched in recent decades. β-tricalcium phosphate (β-TCP) suitable biocompatible, biodegradable material used regeneration. The creation scaffolds with specifically designed surface structures will enable engineering applications that require navigated on substrate pre-set geometric limits. In this study,...

Abstract Ultrashort laser pulses represent a versatile tool that finds application in variety of fields allowing precise and controlled modification any kind materials. The material surface modification, by inducing the formation micro nanostructures or providing chemical changes, its functionalization with other materials, form nanoparticles, strongly affects behavior performances such structuring synthesis deposition metallic nanoparticles has both been obtained exposure. two processes are...

This article presents a novel plasmonic sensing platform designed for the detection of low molecular weight molecules, offering significant advancements in diagnostic applications. The features periodic array gold nanodisks on 20 nm thin silica layer, supported by 100 thick substrate. By leveraging coupling between localized and propagating surface plasmon resonances, this design significantly enhances sensitivity specificity detection. Finite element method simulations are conducted to...

Abstract In this study, the interaction was investigated of femtosecond laser radiation (pulse duration τ = 130 fs, wavelength λ 800 nm) with poly-lactic acid (PLA) 2D scaffolds. Two sets fluences (F) and scanning speed (V) values were applied to PLA matrices - F 1.66 J/cm 2 , V 3.8 mm/s, 0.83 mm/s. The samples thickness, roughness, water contact angle (WCA) characterized before after structuring. fs-induced micro structures by SEM, EDX, FTIR analyses. Preliminary cell fibroblast studies...

Abstract A major drawback of the currently used orthopedic implants is formation a bacterial biofilm on their surface after implantation. potential strategy for overcoming this problem developing micro- and nano-structured motifs implant’s to prevent attachment. Additionally, use materials with inherent antimicrobial properties could further stall aggregation bacteria. This paper demonstrates an approach obtaining modified topography chitosan-graphene 2D films via femtosecond nanosecond...

Ultra-short laser (USL)-induced surface structuring combined with nanoparticles synthesis by multiphoton photoreduction represents a novel single-step approach for commercially pure titanium (cp-Ti) enhancement. Such combination leads to the formation of distinct topographical features covered nanoparticles. The USL processing cp-Ti in an aqueous solution silver nitrate (AgNO3) induces micron-sized spikes surmounted (AgNPs). proposed combines and oxidation Ti AgNPs one-step process, without...

Abstract The aim of the current study is to improve in a one step process properties Ti and alloy surfaces by enhancing their bioactivity order provide better conditions for microbial rejection. We propose alter biomaterial characteristics method alternative chemical ones, namely, non-contact processing surface ultra-short laser pulses. laser-induced modification results with different topographic features an increased presence oxides. performed hierarchical patterning inducing formation...

Abstract Tissue engineering is emerging as a preferred choice for regeneration of irreversible bone tissue defects. It’s main “weapons” are the artificially created biocompatible three-dimensional cellular matrices that mimic extracellular matrix’s structure and provide mechanically stable inert substrate natural growth cells. These porous scaffolds sufficient inner surface cell adhesion, migration, proliferation protrusion “inside” temporal implant, facilitating in way ingrowth...

An increasing amount of research is being devoted to improve the spatial resolution in direct laser writing (DLW) technique allowing fabrication complex 2D and 3D nanoscale devices. Among various possibilities, we exploited uncommon features as extraordinary transmittance, zero re ectance, giant dephasing epsilon-near-zero relative permittivity a metal/insulator/metal/insulator (MIMI) planar multilayer upgrade standard two-photon DLW process hyper resolution. The improved opens new...

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...