Laura Vittadello

Laura Vittadello
Universität Osnabrück | UOS · Experimental Physics

PhD

About

26
Publications
2,736
Reads
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119
Citations
Additional affiliations
May 2018 - present
Universität Osnabrück
Position
  • PostDoc Position
March 2017 - July 2017
University of Padova
Position
  • Tutor junior
Description
  • Support activity with exercices for the class "Physics" for the degree course of Biotechonology
February 2016 - May 2016
Universität Osnabrück
Position
  • PhD Student
Education
September 2012 - January 2013
University of Lorraine
Field of study
  • Physics
October 2011 - April 2014
University of Padova
Field of study
  • Physics
October 2008 - September 2011
University of Padova
Field of study
  • Physics

Publications

Publications (26)
Article
The ternary sulfido bismuthate K3[BiS3] is synthesized in quantitative yields. The material exhibits nonlinear optical properties with strong second harmonic generation properties at arbitrary wavelengths in the infrared spectral range and a notable laser-induced damage threshold of 5.22 GW cm-2 for pulsed laser radiation at a wavelength of 1040 nm...
Article
Full-text available
Lysosomes are vital organelles vulnerable to injuries from diverse materials. Failure to repair or sequester damaged lysosomes poses a threat to cell viability. Here we report that cells exploit a sphingomyelin-based lysosomal repair pathway that operates independently of ESCRT to reverse potentially lethal membrane damage. Various conditions pertu...
Conference Paper
Rapid pattering of honeycomb nonlinear optical, 2D-photonic crystals on ITO is demonstrated via parallel capillary stamping of lithium niobate. Mediated interaction between the photonic crystal and gold nanoparticles by infrared light is validated using SHG.
Article
Full-text available
Near-infrared (NIR) marker-based imaging is of growing importance for deep tissue imaging and is based on a considerable reduction of optical losses at large wavelengths. We aim to extend the range of NIR excitation wavelengths particularly to values beyond 1.6 μm in order to profit from the low loss biological windows NIR-III and NIR-IV. We addres...
Article
Full-text available
Thin micropatterned lithium niobate (LiNbO3) layers may be used for photonic components, actuators and data storage devices because LiNbO3 exhibits nonlinear optical properties as well as anisotropic polarizability and ferroelectric behavior. Commonly, thin micropatterned LiNbO3 layers are integrated into device architectures by complex manufacturi...
Article
Full-text available
In vivo tracking of harmonic nanoparticles (HNPs) in living animals is a technique not yet exploited, despite the great potential offered by these markers, due to a lack of an appropriate tool. The main drawback is the necessity to excite nonlinear effects in the millimeter area in a widefield mode with a sufficient signal to noise ratio. Our appro...
Article
Full-text available
Photoinduced charge transport in lithium niobate for standard illumination, composition and temperature conditions occurs by means of small polaron hopping either on regular or defective lattice sites. Starting from Marcus-Holstein’s theory for polaron hopping frequency we draw a quantitative picture illustrating two underlying microscopic mechanis...
Preprint
Full-text available
Lysosomes are vital organelles vulnerable to injuries from diverse materials. Failure to repair or sequester damaged lysosomes poses a threat to cell viability. Here we report that cells exploit a sphingomyelin-based lysosomal repair pathway that operates independently of ESCRT to reverse potentially lethal membrane damage. Various conditions pertu...
Conference Paper
A widefield nonlinear optical microscope based on pulses having an energy in the µ J and a repetition rate in the kHz regime is conceived to perform harmonic nanoparticles in-vivo tracking in a Drosophila larva.
Conference Paper
In-vivo tracking based on harmonic nanoparticles is so far not exploited because of a lack on an appropriate tool. Here we present a new approach based on the re-design of the laser space parameters.
Article
Full-text available
A strongly temperature-dependent photo-induced transient absorption is measured in 6.5 mol% magnesium-doped lithium niobate at temperatures ranging from 45 K to 225 K. This phenomenon is interpreted as resulting from the generation and subsequent recombination of oppositely charged small polarons. Initial two-photon absorptions generate separated o...
Article
Based on a model of coupled processes with differently time-dependent decay kinetics we present a critical review on photoluminescence (PL) and transient absorption (TA) experiments in undoped and Mg or Fe-doped LiNbO3, together with a comprehensive interpretation of visible radiative and parallel non-radiative decay processes on timescales ranging...
Article
Full-text available
Transmission Raman spectroscopy experiments were performed on iron doped congruent lithium niobate within two –in principle equivalent- configurations, namely Y(ZX)Y and Y(XZ)Y. While the former respects the Raman selection rules, the other configuration gives a time dependent spectrum that, after a transient time of several minutes, finally result...
Article
Transient absorption is studied in Fe-doped lithium niobate single crystals with the goal to control and probe a blue absorption feature related with excitonic states bound to Fe$_\textrm {Li}$Li defect centers. The exciton absorption is deduced from the comparison of ns-pump, supercontinuum-probe spectra obtained in crystals with different Fe-conc...
Article
The thermally activated, incoherent hopping of small electron polarons generated by continuous illumination in iron-doped lithium niobate is simulated by a Marcus-Holstein model for which all the input parameters are known from literature. The results of the calculations are compared with a comprehensive set of data obtained from photorefractive, p...
Article
Full-text available
Transient absorption and photoluminescence are experimentally investigated in the polaronic reference system lithium niobate, LiNbO (LN), with the aim to refine the microscopic model of small polaron dynamics in materials with strong electron–phonon coupling. As a unique feature, our study is performed by using two different spectroscopic methods,...
Article
Full-text available
The thermally activated, incoherent hopping of small electron polarons generated by continuous illumination in iron-doped lithium niobate is simulated by a Marcus-Holstein model for which all the input parameters are known from literature. The results of the calculations are compared with a comprehensive set of data obtained from photorefractive, p...
Article
Full-text available
Small-polaron hopping involved in charge transport in Fe-doped congruent lithium niobate is investigated as a function of temperature and composition by means of light-induced transient absorption spectroscopy. The relaxation dynamics of the light-induced polaron population is characterized by individual activation energies within different tempera...
Article
Charge transport due to small polarons hopping among defective (bound polarons) and regular (free polarons) sites is shown to depend in a non-trivial way from the value of the stabilization energy provided by the lattice distortion surrounding the charge carriers. This energy, normally not directly accessible for bound polarons by spectroscopic tec...
Article
Full-text available
Besides longitudinally varying coupling constants, the longitudinal variation of the propagation constants leads to an additional parameter for the control of adiabatic light transfer in coupled waveguide systems. Examples are given using waveguides structures recorded with the help of the photorefractive effect and mimicking the quantum processes...
Article
The diffraction patterns of 1D aperiodic Fibonacci gratings (FGs) are investigated here. We erive a set of simple formulae which allow the finding of the positions and the intensities of the strongest diffraction peaks amongst the infinite ones present inside a given reciprocal space interval [q1, q2], chosen according to a user-defined threshold....
Article
Full-text available
We study adiabatic light transfer in systems of two coupled waveguides with spatially varying detuning of the propagation constants, providing an analogy to the quantum phenomena of rapid adiabatic passage (RAP) and two-state stimulated Raman adiabatic passage (two-state STIRAP). Experimental demonstration using a photoinduction technique confirms...
Article
Full-text available
We investigate, theoretically and experimentally, the properties of Fibonacci lattices with arbitrary spacings. Different from periodic structures, the reciprocal lattice and the dynamical properties of Fibonacci lattices depend strongly on the lengths of their lattice parameters, even if the sequence of long and short segment, the Fibonacci string...
Article
We demonstrate a simple technique to create a large number of arbitrary optical structures in photorefractive Fe-doped lithium niobate (Fe:LN). The technique consists in directly writing with a focused laser beam at visible wavelength the desired optical structures on a sample, taking advantage of the photorefractive effect. Using a computer-contro...

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Projects

Projects (4)
Project
Develop of new nonlinear microscopy techniques. Study of harmonic nanoparticles properties.