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Juan Marcos Sanz

Juan Marcos Sanz
Textil Santanderina, S.A. · R&D Department

PhD

About

41
Publications
22,485
Reads
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725
Citations
Citations since 2016
12 Research Items
615 Citations
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Introduction
Practised at experimental methods and troubleshooting. Experienced team-worker, suitable for team leadership and managing. I have lab skills and technical knowledge. Good observer, able to improve and to understand new data and processes. I face challenges with enthusiasm, adaptability and resources. I like designing projects and experiments that can positively influence people's welfare. See my professional profile on LinkedIn (https://es.linkedin.com/pub/juan-marcos-sanz-casado/89/9ba/84b)
Additional affiliations
January 2011 - April 2014
Universidad de Cantabria
Position
  • Research Assistant
March 2003 - October 2005
Universidad de Valladolid
Position
  • Researcher
Description
  • Characterization of porous materials and surfaces.

Publications

Publications (41)
Article
The influence of increasing the core size of Ag–Si core–shell nanoparticles has been investigated by using the values of the linear polarization degree at a right-angle scattering configuration, . Changes in dipolar resonances and scattering directionality conditions as a function of the core radius (R int) for a fixed shell size ( nm) have been an...
Article
Full-text available
The ability to infer near-field scattering properties from far-field measurements is of paramount importance in nano-optics. Recently we derived an approximate formula for predicting the frequency shift between near- and far-field intensity peaks in the case of a dielectric sphere. In this work we demonstrate that almost an identical formula can be...
Article
The non-oxidizing catalytic noble metal rhodium is introduced for ultraviolet plasmonics. Planar tripods of 8 nm Rh nanoparticles, synthesized by a modified polyol reduction method, have a calculated local surface plasmon resonance near 330 nm. By attaching p-aminothiophenol, local field-enhanced Raman spectra and accelerated photo-damage were obse...
Article
Full-text available
The practical efficacy of technologically promising metals for use in ultraviolet plasmonics (3–6 eV) is assessed by an exhaustive numerical analysis. This begins with estimates of the near- and far-field electromagnetic enhancement factors of isolated hemispherical and spherical metallic nanoparticles deposited on typical dielectric substrates lik...
Article
Full-text available
High Refractive Index (HRI) dielectric nanoparticles have been proposed as an alternative to metallic ones due to their low absorption and magnetodielectric response in the VIS and NIR ranges. For the latter, important scattering directionality effects can be obtained. Also, systems constituted by dimers of HRI dielectric nanoparticles have shown t...
Article
Full-text available
Current effective medium theories for nano-shells are reviewed. A new method for calculating the effective dielectric function of a core-shell nanoparticle is presented and compared with existing theories showing clear advantages in most conditions. It consists of introducing radiating effects in the polariz- ability of the effective sphere, and co...
Article
The ultraviolet (UV) range presents new challenges for plasmonics, with interesting applications ranging from engineering to biology. In previous research, gallium, aluminum, and magnesium were found to be very promising UV plasmonic metals. However, a native oxide shell surrounds nanostructures of these metals that affects their plasmonic response...
Conference Paper
We analyze the effect of contaminants on the quadrupolar magnetic, dipolar electric and dipolar magnetic resonances of silicon nanoparticles (NPs) by considering the spectral evolution of the linear polarization degree at right angle scattering configuration, PL(90°). From an optical point of view, a decrease in the purity of silicon nanoparticles...
Conference Paper
Plasmonics in the UV-range constitutes a new challenge due to the increasing demand to detect, identify and destroy biological toxins, enhance biological imaging, and characterize semiconductor devices at the nanometer scale. Silver and aluminum have an efficient plasmonic performance in the near UV region, but oxidation reduces its performance in...
Conference Paper
The spectral evolution of the degree of linear polarization (P L) at a scattering angle of 90º is studied numerically for high refractive index (HRI) dielectric spherical nanoparticles. The behaviour of P L (90º) is analyzed as a function of the refractive index of the surrounding medium and the particle radius. We focus on the spectral region wher...
Article
Full-text available
The near-field electromagnetic scattering intensity resonances are redshifted in frequency with respect to their far-field counterparts. We derive simple, approximate, analytical formulas for this shift in the case of a plane wave interacting with a dielectric sphere. Numerical results comparing the approximate formulas to the numerically exact sol...
Article
Local field enhancements produced by metal nanoparticles have been widely investigated in the visible range for common metals like gold and silver, but recent interest in ultraviolet plasmonics has required consideration of alternate metals. Aluminum and gallium are particularly attractive, but the native oxide that forms on them consumes the metal...
Article
Full-text available
The spectral evolution of the degree of linear polarization (PL) at a scattering angle of 90° is studied numerically for high refractive index (HRI) dielectric spherical nanoparticles. The behaviour of PL(90°) is analysed as a function of the refractive index of the surrounding medium and the particle radius, and it is compared with the more conven...
Article
In this research, the Mueller Matrix (MM) imaging polarimetry technique is used to experimentally measure the MM's corresponding to the surface reflectance of turbid media in which an opaque object is immersed. Depending on the penetration depth of light in the medium and the location of the object, the MM may be sensitive enough as to detect not o...
Article
Self-assembled, irregular ensembles of hemispherical Ga nanoparticles (NPs) were deposited on sapphire by molecular beam epitaxy. These samples, whose constituent unimodal or bimodal distribution of NP sizes was controlled by deposition time, exhibited localized surface plasmon resonances tunable from the ultraviolet to the visible (UV/vis) spectra...
Conference Paper
Full-text available
The influence of the degree of purity of a silicon nanoparticle on both its electric and magnetic resonances is assessed by using Mie theory as well as finite-element simulations. In particular, it is shown that the increased absorption due to the pollutants affects mainly magnetic resonances. Resistive losses corroborate this effect, showing that...
Article
Full-text available
The influence of the degree of purity of a silicon nanoparticle on its resonances, either electric or magnetic, is assessed by using Mie theory as well as finite-element simulations. In particular, it is shown that the main effect of the increase of absorption due to the pollutants is observed in the magnetic resonances. Concerning Kerker’s conditi...
Conference Paper
Full-text available
Electromagnetic enhancement of metallic nanoparticles on substrates is assessed by an exhaustive numerical analysis. The potential of each technologically promising metal for UV-plasmonic applications may be ascertained.
Article
Full-text available
Since polarimetry has extended its use for the study of scattering from surfaces and tissues, Spectralon, a white reflectance standard, is acquiring the role of a polarimetric standard. Both the behavior of Spectralon as a Lambertian surface and its performance as a perfect depolarizer are analyzed in detail. The accuracy of our dynamic polarimeter...
Conference Paper
Full-text available
We examine the plasmonic properties of silver and gold nanospheres and dimers, with radii ranging from 10 nm to 1 nm, extending from the classically described regime to the quantum size regime. We have studied the spectral extinction cross-section by using the T-matrix method. The results indicate an increasingly substantial change in nanoparticle...
Article
Full-text available
The optical properties of metallic nanoparticles (NPs) can be described with analytical models based on fundamental quantum mechanical principles, of which the Drude model constitutes the classical limit. Here, we examine the plasmonic properties of silver and gold nanospheres and dimers, with radii ranging from 10 to 1 nm, extending from the class...
Article
Full-text available
In this research, the Polar Decomposition (PD) method is applied to experimental Mueller Matrices (Mms) measured for light scattering systems. Polarization information is expressed through a set of parameters of easier physical interpretation than pure Mms. Particulary, for 2D microstructured systems on flat surfaces, the first derivative of the re...
Article
Full-text available
In this research, the polar decomposition (PD) method is applied to experimental Mueller matrices (MMs) measured on two-dimensional microstructured surfaces. Polarization information is expressed through a set of parameters of easier physical interpretation. It is shown that evaluating the first derivative of the retardation parameter, δ, a clear i...
Conference Paper
Full-text available
A set of light-scattering results is presented in the form of Mueller Matrices (MM) and their corresponding Polar Decomposition (PD) parameters. The system under analysis is a square microstructure on a flat substrate, in the form of either a rib or a groove (or several equally spaced, depending on the experiment). As it is well known, MM contains...
Article
Full-text available
In this research, the Polar Decomposition (PD) has been applied to the Mueller matrices (MMs) of the light scattered by linear ribs of rectangular profile on a flat substrate. Although photo-lithographic technique produces a silicon surface, metallic character is acquired by sputtering with gold some of the samples. With a dual rotating compensator p...
Article
a b s t r a c t We have applied the polar decomposition theorem (PDT) to the scattering matrix of simple systems such as an isolated sphere, either metallic or dielectric. The discrete dipole approximation (DDA) method has been used as an intermediate tool to calculate these matrices. We show how the parameters introduced by the PDT for describing...
Article
Full-text available
Several UF membranes with fairly different structure have been characterized by using a liquid–liquid displacement porometer, which has been developed under a close collaboration of our laboratories. Three polysulfone membranes from Millipore and three polycarbonate membranes from Nuclepore–Whatman were studied. The results of pore size distributio...
Article
Full-text available
We present an optical method for the nanoscopic inspection of surfaces. The method is based on the spectral and polarization analysis of the light scattered by a probe nanoparticle close to the inspected surface. We explore the sensitivity to changes either in the probe-surface distance or in the refractive index of the surface.
Article
Full-text available
We have successfully applied the polar decomposition (PD) to the scattering matrix of coupling metallic nanospheres. The Discrete Dipole Approximation method (DDA) has been used as an intermediate tool to calculate these matrices. We also present a simple model based on the interference to justify the presence of a minimum in the scattered intensit...
Article
Definir los parámetros de polarización de la luz procedente de una muestra aporta una mayor información sobre las propiedades de ésta que la simple medida de la intensidad luminosa difundida. Cuando un haz luminoso sufre una perturbación debida a cualquier interacción con un medio, los campos electromagnéticos del haz incidente y el del haz emergen...

Questions

Questions (2)
Question
I want to know the amount and type of impurities in a water based metal-oxide colloidal sample. Some options could be X-ray diffraction, Mass spectrometry, Electron transmission microscopy,.... What do you think?
Question
Let's say that I have Al2O3 or SiO2 dry nano-powder with an APS around 50-100 nm. Can it be dispersed in water just by stirring? or is it necessary to sonicate? Do I need a dispersing agent? Thanks in advance

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Projects

Project (1)
Project
New metallic materials for Plasmonics applications in the UV range.