Manuel Ballester
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View article: Comprehensive Optoelectronic Study of Copper Nitride: Dielectric Function and Bandgap Energies
Comprehensive Optoelectronic Study of Copper Nitride: Dielectric Function and Bandgap Energies Open
Copper nitride (Cu3N) is gaining attention as an eco-friendly thin-film semiconductor in a myriad of applications, including storage devices, microelectronic components, photodetectors, and photovoltaic cells. This work presents a detailed…
View article: Physical exercise and brain network dynamics: reduction of frontoparietal-striatal connectivity following 1 hour of aerobic cycling
Physical exercise and brain network dynamics: reduction of frontoparietal-striatal connectivity following 1 hour of aerobic cycling Open
Physical exercise is beneficial for metabolic health and cognitive performance. In addition, exercise can be highly pleasurable and and serves as an effective stress reliever. Extant studies have highlighted frontal, parietal, and subcorti…
View article: Angular spectrum approach to inverse synthesis for the characterization of optical and geometrical properties of semiconductor thin films
Angular spectrum approach to inverse synthesis for the characterization of optical and geometrical properties of semiconductor thin films Open
To design semiconductor-based optical devices, the optical properties of the used semiconductor materials must be precisely measured over a large spectral band. Transmission spectroscopy stands out as an inexpensive and widely available me…
View article: Enhancing the Swanepoel method: precise envelope detection of thin-film transmission spectra
Enhancing the Swanepoel method: precise envelope detection of thin-film transmission spectra Open
The Swanepoel method is a widely used optical technique for characterizing thin films through normal-incidence transmission measurements. A critical step in this approach involves extracting the upper and lower envelopes of the measured os…
View article: Review and novel formulae for transmittance and reflectance of wedged thin films on absorbing substrates
Review and novel formulae for transmittance and reflectance of wedged thin films on absorbing substrates Open
Historically, spectroscopic techniques have been essential for studying the optical properties of thin solid films. However, existing formulae for both normal transmission and reflection spectroscopy often rely on simplified theoretical as…
View article: Charge Diffusion and Repulsion in Semiconductor Detectors
Charge Diffusion and Repulsion in Semiconductor Detectors Open
Semiconductor detectors for high-energy sensing (X/γ-rays) play a critical role in fields such as astronomy, particle physics, spectroscopy, medical imaging, and homeland security. The increasing need for precise detector characterization …
View article: Characterization of Crystal Properties and Defects in CdZnTe Radiation Detectors
Characterization of Crystal Properties and Defects in CdZnTe Radiation Detectors Open
CdZnTe-based detectors are highly valued because of their high spectral resolution, which is an essential feature for nuclear medical imaging. However, this resolution is compromised when there are substantial defects in the CdZnTe crystal…
View article: Finding Transmittance Spectrum Envelopes for Optical Characterization of Thin Solid Films
Finding Transmittance Spectrum Envelopes for Optical Characterization of Thin Solid Films Open
We propose a novel optimization approach for determining the envelopes of thin-film transmittance spectra. This method can be coupled with the Swanepoel algorithm to determine the optical properties of the thin films.
View article: Simulation of Polarized Light Microscopy for Multiple Analyzer Angles
Simulation of Polarized Light Microscopy for Multiple Analyzer Angles Open
We have developed an efficient simulator for polarized light microscopy experiments. It supports calculations for multiple analyzer angles across different channels of a polarized camera, enhancing imaging capabilities. Our model is public…
View article: Characterization of Crystal Properties and Defects in CdZnTe Radiation Detectors
Characterization of Crystal Properties and Defects in CdZnTe Radiation Detectors Open
CdZnTe-based detectors are highly valued because of their high spectral resolution, which is an essential feature for nuclear medical imaging. However, this resolution is compromised when there are substantial defects in the CdZnTe crystal…
View article: Review and Novel Formulae for Transmittance and Reflectance of Wedged Thin Films on absorbing Substrates
Review and Novel Formulae for Transmittance and Reflectance of Wedged Thin Films on absorbing Substrates Open
Historically, spectroscopic techniques have been essential for studying the optical properties of thin solid films. However, existing formulae for both normal transmission and reflection spectroscopy often rely on simplified theoretical as…
View article: Synthetic Light-in-Flight
Synthetic Light-in-Flight Open
Light-in-flight (LiF) measurements allow to resolve and visualize the path that light travels through an arbitrary volumetric scene. Traditional LiF methods involve expensive high-speed electronics or narrow-pulse light sources. We present…
View article: An Angular Spectrum Approach to Inverse Synthesis for the Characterization of Optical and Geometrical Properties of Semiconductor Thin Films
An Angular Spectrum Approach to Inverse Synthesis for the Characterization of Optical and Geometrical Properties of Semiconductor Thin Films Open
To design semiconductor-based optical devices, the optical properties of the used semiconductor materials must be precisely measured over a large band. Transmission spectroscopy stands out as an inexpensive and widely available method for …
View article: Modeling and Simulation of Charge-Induced Signals in Photon-Counting CZT Detectors for Medical Imaging Applications
Modeling and Simulation of Charge-Induced Signals in Photon-Counting CZT Detectors for Medical Imaging Applications Open
Photon-counting detectors based on CZT are essential in nuclear medical imaging, particularly for SPECT applications. Although CZT detectors are known for their precise energy resolution, defects within the CZT crystals significantly impac…
View article: Identifying Defects without a priori Knowledge in a Room-Temperature Semiconductor Detector Using Physics Inspired Machine Learning Model
Identifying Defects without a priori Knowledge in a Room-Temperature Semiconductor Detector Using Physics Inspired Machine Learning Model Open
Room-temperature semiconductor radiation detectors (RTSD) such as CdZnTe are popular in Computed Tomography (CT) imaging and other applications. Transport properties and material defects with respect to electron and hole transport often ne…
View article: Mid-Infrared (MIR) Complex Refractive Index Spectra of Polycrystalline Copper-Nitride Films by IR-VASE Ellipsometry and Their FIB-SEM Porosity
Mid-Infrared (MIR) Complex Refractive Index Spectra of Polycrystalline Copper-Nitride Films by IR-VASE Ellipsometry and Their FIB-SEM Porosity Open
Copper-nitride (Cu3N) semiconductor material is attracting much attention as a potential, next-generation thin-film solar light absorber in solar cells. In this communication, polycrystalline covalent Cu3N thin films were prepared using re…
View article: Mid-Infrared Complex Refractive Index Spectra of Polycrystalline Copper-Nitride Films by IR-VASE Ellipsometry and Their FIB-SEM Porosity
Mid-Infrared Complex Refractive Index Spectra of Polycrystalline Copper-Nitride Films by IR-VASE Ellipsometry and Their FIB-SEM Porosity Open
Copper-nitride (Cu3N) semiconductor material is attracting much attention as a potential, next-generation thin-film solar-light absorber in solar cells. In this communication, polycrystalline Cu3N thin films were prepared using reactive-RF…
View article: A Physics based Machine Learning Model to characterize Room Temperature Semiconductor Detectors in 3D
A Physics based Machine Learning Model to characterize Room Temperature Semiconductor Detectors in 3D Open
Room temperature semiconductor radiation detectors (RTSD) for X-ray and gamma-ray detection are vital tools for medical imaging, astrophysics and other applications. CdZnTe (CZT) has been the main RTSD for more than three decades with desi…
View article: Complementary Characterization of Polycrystalline Copper-Nitride Films by UV-MIR (0.2-40 µm) Ellipsometry and FIB-SEM Microscopy
Complementary Characterization of Polycrystalline Copper-Nitride Films by UV-MIR (0.2-40 µm) Ellipsometry and FIB-SEM Microscopy Open
Copper-nitride (Cu3N) material is attracting much attention as a potential next-generation thin-film solar-light absorber. In this work, polycrystalline Cu3N thin films were prepared using reactive-RF-magnetron sputtering, at room temperat…
View article: Optical Properties of Reactive RF Magnetron Sputtered Polycrystalline Cu3N Thin Films Determined by UV/Visible/NIR Spectroscopic Ellipsometry: An Eco-Friendly Solar Light Absorber
Optical Properties of Reactive RF Magnetron Sputtered Polycrystalline Cu3N Thin Films Determined by UV/Visible/NIR Spectroscopic Ellipsometry: An Eco-Friendly Solar Light Absorber Open
Copper nitride (Cu3N), a metastable poly-crystalline semiconductor material with reasonably high stability at room temperature, is receiving much attention as a very promising next-generation, earth-abundant, thin film solar light absorber…
View article: Deep Learning Method to Find Swanepoel Envelopes in Transmission Spectroscopy
Deep Learning Method to Find Swanepoel Envelopes in Transmission Spectroscopy Open
This research presents a novel Deep Learning method to find the Swanepoel Envelopes from the transmission spectra of dielectric thin films. This method improves the efficiency and accuracy of the film’s optical characterization.
View article: Optical Properties of RF-Magnetron-Sputtered Polycrystalline Cu<sub>3</sub>N Thin Films Determined by UV/visible/NIR Spectroscopic Ellipsometry: Eco-Friendly Light Absorber
Optical Properties of RF-Magnetron-Sputtered Polycrystalline Cu<sub>3</sub>N Thin Films Determined by UV/visible/NIR Spectroscopic Ellipsometry: Eco-Friendly Light Absorber Open
Copper nitride (Cu3N), a metastable semiconductor material, but with reasonably-high-stability at room temperature, is drawing a great deal of attention as a very promising next-generation, earth-abundant, thin-film solar absorber. Its non…
View article: Single-shot ToF sensing with sub-mm precision using conventional CMOS sensors
Single-shot ToF sensing with sub-mm precision using conventional CMOS sensors Open
We present a novel single-shot interferometric ToF camera targeted for precise 3D measurements of dynamic objects. The camera concept is based on Synthetic Wavelength Interferometry, a technique that allows retrieval of depth maps of objec…
View article: Application of the Holomorphic Tauc-Lorentz-Urbach Function to Extract the Optical Constants of Amorphous Semiconductor Thin Films
Application of the Holomorphic Tauc-Lorentz-Urbach Function to Extract the Optical Constants of Amorphous Semiconductor Thin Films Open
The Tauc–Lorentz–Urbach (TLU) dispersion model allows us to build a dielectric function from only a few parameters. However, this dielectric function is non-analytic and presents some mathematical drawbacks. As a consequence of this issue,…
View article: Optical Characterization of H-Free a-Si Layers Grown by rf-Magnetron Sputtering by Inverse Synthesis Using Matlab: Tauc–Lorentz–Urbach Parameterization
Optical Characterization of H-Free a-Si Layers Grown by rf-Magnetron Sputtering by Inverse Synthesis Using Matlab: Tauc–Lorentz–Urbach Parameterization Open
Several, nearly-1-µm-thick, pure, unhydrogenated amorphous-silicon (a-Si) thin layers were grown at high rates by non-equilibrium rf-magnetron Ar-plasma sputtering (RFMS) onto room-temperature low-cost glass substrates. A new approach is e…