1,720,979 research outputs found
Dataset for "Temporal quadratic solitons and their interaction with dispersive waves in Lithium Niobate nano-waveguides"
No full textThis dataset includes simulated effective refractive index and dispersion data for two examples of Lithium Niobate nanowaveguides and XFROG spectrogram data from simulated propagation of different nonlinear pulses in those two example waveguides.
The refractive index data was collected by simulating the waveguides in COMSOL multiphysics (5.3a), a commercial eigenmode solver. The dispersion data was produced by processing the refractive index data (as described in the associated publication). The XFROG spectrogram data was produced by simulating the propagation of pulses in the two waveguides using the well known Split-step Fourier method. The method by which the XFROG spectrograms is briefly explained in the associated publication.
The associated publication is open access.The data collection methods are described in detail in the associated publication which is open access.The data is organised into folders for each figure and subfigure panel.
The data is given in ".csv" format with each data column labelled with units where appropriate.
Data for figures 2, 3 and 4 are given.
The data for figure 1 is omitted as it is simple to reproduce from the explanation in the associated publication
Dataset for "Raman solitons in waveguides with simultaneous quadratic and Kerr nonlinearities"
No full textThe dataset includes data for predictions and simulations of two-component Raman soliton propagation in Lithium Niobate nano-waveguides. Examples of frequency shift and resulting acceleration of solitons under both anomalous and normal dispersion are given each for both quadratic and cascaded Kerr soliton regimes. We provide similar data for cases of soliton collapse in both anomalous and normal dispersion. Predictions were made by treating the Raman response as a perturbation to the soliton. Simulations were done using the Split-Step Fourier method.
We also include modelled Raman response spectrum data for Lithium Niobate and silica.
Shifts in peak frequency of each soliton component are given as a function inverse soliton velocity and soliton propagation constant, calculated by Newton-Raphson method.
Data for soliton frequency shift as a function of soliton peak power is given for both Kerr and two-component solitons. These data were calculated using the semi-analytical perturbation method.The data collection methods are described in detail in the associated publication.The data is organised into folders for each figure and subfigure panels where applicable. The data is given in ".csv" format with each data column labelled with units where appropriate
Data set for "Doubly-resonant enhancement of Second Harmonic Generation from a WS2 nanomesh polymorph with a modified energy landscape"
No full textWS2 is an example of a transition metal dichalcogenide, and a highly promising 2D material for nonlinear optics. This dataset contains plots of multiphoton emission spectra and coordinates of second harmonic generation (SHG) hotspots of WS2 polymorphs and thin films formed into a nanomesh, that is, a tridimensional webbed network of densely-packed stacks (of 1–5 layers) of twisted and/or fused 2D nanosheets. The locations of the emission hotspots were determined by illumination at 1225, 1050, and 850 nm incident wavelengths.Multiphoton imaging: Samples were illuminated from 850 to 1300 nm in incrememnts of 25 nm with a constant average power of 0.5 mW. Images of the emission from 425 to 650 in 32 steps were taken.An in house script was used to take the resulting images, convert them to greyscale and averaging the pic intensity in the area specified using the coordinates chosen or the whole of the image. The resultant data was then plotted.Zen Blue was used to obtain the data and Zen Black to convert the .czi to .jif files. A python script was then used and results in a .csv file. Origin was then used to plot the data.Hotspot coordinates are provided in MS Excel format. The plot of pixel intensity versus wavelength is provided as an Origin Unicode Project file, which may be inspected with the Origin Viewer application
Dataset for "Soliton dynamics in lithium niobate nano-waveguides"
No full textThis dataset contains simulated data and data from analytic predictions of soliton propagation in lithium niobate nano-waveguides. The data is grouped into four folders: two of these contain animations of simulated soliton and pulse propagation, the other two contain simulated and predicted data for soliton propagation under the influence of the Raman effect. These data are provided to aid the understanding of thesis and are in addition to other datasets produced for the publication of the work previously (see documentation section for more info).The simulation data contained within this archive were produced by numerical simulation of pulse propagation in lithium niobate nano-waveguides. This simulation was done using the well known split-step Fourier method. The visualisation of the results shown for figures 4-4 and 4-5 are produced by the commonly used XFROG (cross-correlation frequency resolved optical gating) spectrogram in which both spectral and temporal features of the simulation can be observed at once. Simulation data for figures 5-7 and 5-8 are given in both the time and frequency domains and predictions are made using the theory we have developed for self-frequency shift in two-component solitons.
All these methods are explained in more detail in the thesis to which this dataset is associated.The thesis "Soliton dynamics in lithium niobate nano-waveguides" contains three research chapters with the majority of their content copied verbatim from three publications. These publications have their own archived datasets and so the majority of the research data from the thesis is contained within those pre-existing datasets. This dataset provides research data for parts of the thesis that were not contained within those three publications and is therefore missing from the pre-existing datasets. Links to the three pre-existing datasets can be found in the 'Related datasets and code' section of this dataset
Dataset for: "Solitons near avoided mode crossings in χ⁽²⁾ nanowaveguides"
No full textThis dataset contains modelled dispersion of effect refractive indices for three guided modes for a particular lithium niobate nanowaveguide structure. Two of these guided modes show a particularly interesting characteristic of an avoided mode crossing which the work in the associated manuscript is based on. Data is also included for the predicted modulation instability gain for continuous wave solutions in the modelled system. Simulation data for modulation instability are also included showing its impact on the spectrum and formation of trains of solitons from an unstable continuous wave solution. This work also contains predictions made for the solitons that exist in this system. We include data for predicted pulse energy as well as mapping these solitons from their plane of existence onto the linear dispersion of the system. XFROG spectrograms are given for an example soliton solution showing their unusual specro-temporal structure as well as line plots of many solitons temporal and spectral domain separately. Finally we include simulations of soliton propagation in this system.Effective refractive index data was modelled using COMSOL Multiphysics (5.3a) combined with self-written code in MATLAB 2020b. Production of all other data is described in the associated publication.The data is organised into folders for each figure and subfigure panel.
The data is given in ".csv" format with each data column labelled with units where appropriate
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Data supporting the paper "Trapping of ultrashort pulses in non-degenerate parametric conversion"
No full textThe dataset consists of several MATLAB data files (*.mat), corresponding to the figures in the paper. The naming of the files is self-explanatory. Each MATLAB file contains all variables (as arrays) used in each plot. For 2D plots, there are separate 1D arrays for x- and y- coordinates, i.e., if there are several lines in a plot, there will be several corresponding variables for the y-coordinates of each line. For surface plots, all variables are stored as 2D arrays.Full details of the methodology may be found in the associated paper
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