We demonstrate the generation of optical vortices with radial or azimuthal polarization using a space variant converter, fabricated by femtosecond laser writing self-assembled nanostructures in silica glass. Manipulation induced form birefringence is achieved controlling parameters, particular, azimuth beam. The converter allows switching from to handedness incident circular polarization.

We demonstrate recording and retrieval of the digital document with a nearly unlimited lifetime. The process multiplexed data was implemented by femtosecond laser nanostructuring fused quartz. storage allows unprecedented parameters including hundreds terabytes per disc capacity, thermal stability up to 1000 °C, virtually lifetime at room temperature. anticipate that this demonstration will open new era eternal archiving.

An overview of recent achievements in the field femtosecond laser writing transparent materials is presented. Thanks to unique properties light–matter interaction on ultrashort time scale, this direct technique has led observation phenomena, including nonreciprocal and anisotropic photosensitivity, allowed engineering novel photonic devices.

We review recent progress in application of femtosecond laser nanostructuring fused silica.The tight control nanostructures' properties through writing parameters is demonstrated implementing elements with unique optical properties, which can be widely used material processing, microscopy, trapping and manipulation.©2011 Optical Society America

Ultrafast writing dynamics of form birefringence is experimentally demonstrated. Based on this anisotropic response created by photoinduced self-organization, rewritable 5D (X,Y,Z, slow axis direction, and retardance) optical data storage realized using liquid-crystal technology (see figure).

We propose a single beam method for generating optical vortices with tunable angular momentum without altering the intensity distribution. With initial polarization state varying from linear to circular, we gradually control torque transferred trapped non-absorbing and non-birefringent silica beads. The continuous transition maximum rotation speed zero changing trapping potential gives way study complex tribological interactions.

We demonstrate a comprehensive modification study of silica glass, crystalline silicon, and amorphous silicon film, irradiated by tightly focused cylindrical vector beams with azimuthal radial polarizations. The evidence the longitudinal field associated polarization is revealed second harmonic generation in z-cut lithium niobate crystal. Despite lower threshold ring-shaped materials, center single pulse radially polarized beam not observed. phenomenon interpreted terms enhanced reflection...

We demonstrate a polarization-sensitive diffractive optical element by femtosecond laser direct writing of light-induced self-assembled nano-gratings in bulk silica glass. Manipulation the induced form birefringence is achieved controlling parameters, particular, polarization azimuth beam. The performance diffraction-based circular-polarization beam splitter agrees with theoretical prediction. method allows extending operation space-variant subwavelength gratings converters to visible range.

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Martynas Beresna, Mindaugas Gecevičius, Peter G. Kazansky, Thomas Taylor, Alexey V. Kavokin; Exciton mediated self-organization in glass driven by ultrashort light pulses. Appl. Phys. Lett. 30 July 2012; 101 (5): 053120. https://doi.org/10.1063/1.4742899 Download citation file: Ris (Zotero) Reference Manager...

The refractive index changes in doped silica are investigated. We observed that the permanent isotropic change threshold (T1) is not significantly dependent on doping. show strong birefringence (permanent linear birefringence) exists but its (T2) exhibits significant dependence used dopants. In our conditions, comparing with (0.31 μJ/pulse here), for 1.5 at% Ge-doped T2 smaller (0.14 ± 0.05 μJ/pulse). For a 0.3 of fluorine, close to 1.20 μJ/pulse. An interpretation given only about variation...

Microstructured polymer optical fibers (MPOFs) have long attracted great interest due to their wide range of applications in biological and chemical sensing. In this manuscript, we demonstrate a novel technique manufacturing MPOF via single-step procedure by means 3D printer. A suspended-core fiber has been extruded directly drawn from micro-structured printer nozzle using an acrylonitrile butadiene styrene (ABS) polymer. Near-field imaging at the facet performed wavelength λ~1550 nm clearly...

Mid-infrared (mid-IR) optical fibers have long attracted great interest due to their wide range of applications in security, biology and chemical sensing. Traditionally, research was directed towards materials with low absorption the mid-IR region, such as chalcogenides, which are difficult manipulate often contain highly toxic elements. In this paper, we demonstrate a Polyethylene Terephthalate Glycol (PETG) hollow-core fiber (HCF) guiding properties mid-IR. Guiding is provided by geometry,...

We present a low-noise distributed acoustic sensor using enhanced backscattering fiber with series of localized reflectors. The point reflectors were inscribed in standard telecom fully automated system by focusing an ultra-fast laser through the cladding. provided reflectance -53 dB, significantly higher than Rayleigh level -70 dB/m, despite adding only 0.01 dB loss per 100 reflection points. constructed coherent φ-OTDR double-pulse architecture to probe fiber. Using this system, we found...

The ability of 8 picosecond pulse lasers for three dimensional direct-writing in the bulk transparent dielectrics is assessed through a comparative study with femtosecond laser delivering 600 fs pulses.The comparison addresses two main applications: fabrication birefringent optical elements and two-step machining by exposure postprocessing chemical etching.Formation self-organized nano-gratings glass ps-pulses demonstrated.Differential etching between ps-laser exposed regions unexposed...

Under certain exposure conditions, femtosecond lasers create nanogratings in the bulk of fused silica for which orientation is governed by laser polarization. Such nanostructure induces stress that affects optical and chemical properties material. Here, we present a method based on retardance measurement to quantify around affected zones. Further, demonstrate dependence show within single lamellae can locally be as high several gigapascals.

Self-assembled nanostructures created by femtosecond laser irradiation are demonstrated in alkali-free aluminoborosilicate glass. The growth of the induced retardance associated with nanograting formation is three orders magnitude slower than silica glass and observed only within a narrow range pulse energies. However, strength asymptotically approaches value typically measured pure glass, which attractive for practical applications. A similar intensity threshold about 1 TW/cm2 all glasses...

A simple technique for directly generating a radially polarized output beam from cladding-pumped ytterbium-doped fiber laser is reported. Our approach based on the use of nanograting spatially variant waveplate as an intracavity polarization-controlling element. The yielded ~32 W power (limited by available pump power) with TM (01)-mode at 1040 nm corresponding slope efficiency 66% and polarization purity 95%. beam-propagation factor (M(2)) was measured to be ~1.9-2.1.

Direct-write femtosecond laser nanostructuring of 300 nanometer thick a-Si:H films results in space-variant functional metasurfaces with form birefringence up to Δn ≈ –0.5. Engineering the orientation local optical axis allows implementing continuous phase profiles nearly any element including arrays polarization microconverters and microlenses, gratings, computer-generated holograms gradients ≈1 rad µm−1. The recent advances flat optics have challenged limitations conventional by ultrathin...

We report the use of a terahertz (THz) transparent material, cyclic olefin copolymer (COC or TOPAS), for fabricating hollow-core antiresonant fiber that provides an electromagnetic wave guidance in THz regime. A novel fabrication technique to realize polymer optical (HC-ARPF) is proposed and demonstrated. The directly extruded single-step procedure using conventional fused deposition modeling 3D printer. geometry defined by structured nozzle manufactured with metal printer, which allows...

We present the first experimental evidence of anisotropic photosensitivity an isotropic homogeneous medium under uniform illumination. Our experiments reveal fundamentally new type light induced anisotropy originated from hidden asymmetry pulsed beam with a finite tilt intensity front. anticipate that observed phenomenon, which enables employing mutual orientation polarization plane and pulse front to control interaction matter ultrashort pulses, will open opportunities in material processing.

Four 3rd order fiber Bragg gratings were inscribed into separate cores of a 7 core multi-core using the point-by-point inscription technique.A 1030 nm, 206 ± 5 fs laser was used, operating at frequency 1 kHz and pulse energy 2.1 0.2 µJ.Independent resonances λ B = 1541.01± 0.02, 1547.82 1532.66 1537.42 0.02 nm extinction ratios 13.97 0.4, 16.02 10.08 0.4 13.40 dB recorded.Our data analysis shows that refractive index changes, Δn, 10 -3 induced.Core-specific in can provide flexible versatile...

Securely storing large amounts of information over relatively short timescales 100 years, comparable to the span human memory, is a challenging problem. Conventional optical data storage technology used in CDs and DVDs has reached capacities hundreds gigabits per square inch, but its lifetime limited decade. DNA based can hold terabytes gram, durability limited. The major challenge lack appropriate combination medium possessing advantages both high capacity long lifetime. recording retrieval...

The structural evolution from void modification to self-assembled nanogratings in fused silica is observed for moderate (NA > 0.4) focusing conditions. Void formation, appears before the geometrical focus after initial few pulses and subsequent irradiation, gradually occur at top of induced structures. Nonlinear Schrödinger equation based simulations are conducted simulate laser fluence, intensity electron density regions modification. Comparing experiment with simulations, voids form due...

Abstract Fibre optic technology is rapidly evolving, driven mainly by telecommunication and sensing applications. Excellent reliability of the manufacturing processes low cost have drawn ever increasing attention to fibre-based sensors, e.g. for studying mechanical response/limitations aerospace composite structures. Here, a vector bending orientation distinguishing curvature sensor, based on asymmetric coupled multi-core fibre, proposed experimentally demonstrated. By optimising mode...