Xavier Zambrana-Puyalto

Xavier Zambrana-Puyalto
Istituto Italiano di Tecnologia | IIT · Plasmon Nanotechnologies

BEng, MEng, BSc, PhD

About

73
Publications
16,268
Reads
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1,358
Citations
Citations since 2016
43 Research Items
1155 Citations
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2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
Introduction
Xavier Zambrana-Puyalto currently works at the Plasmon Nanotechnologies, Istituto Italiano di Tecnologia. Xavier does research in Molecular and Optical Physics and Electromagnetism.
Additional affiliations
February 2021 - December 2021
INO - Istituto Nazionale di Ottica
Position
  • Researcher
September 2019 - December 2021
Istituto Italiano di Tecnologia
Position
  • Researcher
November 2016 - June 2019
Istituto Italiano di Tecnologia
Position
  • PostDoc Position

Publications

Publications (73)
Article
Full-text available
Circular dichroism, that is, the differential absorption of a system to left and right circularly polarized light, is one of the only techniques capable of providing morphological information of certain samples. In biology, for instance, circular dichroism spectroscopy is widely used to study the structure of proteins. More recently, it has also be...
Thesis
Full-text available
Light beams can be symmetric under different transformations: translations, rotations, mirror symmetries, duality transformations, etc. In this thesis, a systematic way of characterizing these symmetries is presented. Then, it is shown that light beams symmetric under different transformations can be used to control light-matter interactions at the...
Article
Full-text available
We measure the far-field intensity of vortex beams going through nanoholes. The process is analyzed in terms of helicity and total angular momentum. It is seen that the total angular momentum is preserved in the process, and helicity is not. We compute the ratio between the two transmitted helicity components, $\gamma_{m,p}$. We observe that this r...
Article
Full-text available
In optics, whispering gallery modes (WGMs) are modes of light that arise in cylindrically symmetric structures. Their intensity profile is strongly confined around the interface of the structure, and their Q‐factors are some of the highest ever measured with light. Here, the physical mechanisms governing the coupling of a tangential beam into a WGM...
Article
Full-text available
Plasmonic nanopores are the subject of extensive investigations as a potential platform to enable efficient optical read-out in translocation experiments with biomolecules such as DNA and proteins. They allow for the engineering of electromagnetic fields at the nanoscale, which are typically used to enhance the emission efficiency of fluorescent mo...
Article
Full-text available
The study of helicity in the context of light-matter interactions is an increasing area of research. However, some fundamental aspects of the helicity content of light fields inside scatterers have been overlooked. In this work, we demonstrate that the helicity of light fields inside lossless spherical cavities cannot be either conserved or sign fl...
Preprint
Full-text available
The study of helicity in the context of light-matter interactions is an increasing area of research. However, some fundamental aspects of the helicity content of light fields inside scatterers have been overlooked. In this work, we demonstrate that the helicity of light fields inside lossless spherical cavities cannot be either conserved or sign-fl...
Article
Full-text available
Whispering Gallery Mode resonators are dielectric structures with cylindrical symmetry. They are typically excited with an evanescent field leaking out of a tapered fiber or a waveguide. It is also known that they can be excited with free propagating beams. In this work, we use a recently developed analytical model which quantitatively describes th...
Article
Full-text available
Recent experiments demonstrate strongly directional coupling of light into waveguide modes. Here, the symmetry mechanisms behind this effect are studied, and it is shown that the analysis of the symmetries and symmetry‐breakings of the emitter‐waveguide system allows to qualitatively understand directional coupling in several situations. The author...
Article
Full-text available
Starting from a recently developed model based on the generalized Lorenz-Mie theory, we simulate and experimentally investigate the resonance spectrum and the scattered light field of whispering-gallery modes (WGMs) in a liquid droplet excited with a free-space visible laser beam. Depending on the illumination configuration and the spectral region,...
Presentation
Full-text available
A bottom-up and top-down nanofabrication method to build nanopore arrays of organic and inorganic substrates taking advantage of a biological protein scaffold, resulting in a hybrid device with plasmonic behavior affecting its fluorescence properties.
Poster
Full-text available
Advances in biochemistry have shed light on proteins that defy the dogma "one sequence, one structure, one function", i.e., chameleonic proteins, intrinsically disordered proteins, metamorphic proteins and morpheeins. These biomolecules fold into multiple secondary and tertiary structures and as morpheeins self-assemble into several quaternary comp...
Article
High refractive index dielectric spheres present remarkable light-scattering properties in the spectral range dominated by dipolar modes. However, most of these properties are absent for larger spheres under plane wave illumination. Here, a proposal to unravel these dipolar regimes for larger particles under the illumination of a pure dipolar field...
Article
Full-text available
Waveplates are optical elements that are mainly used to tailor the polarization of collimated optical beams. Their use is as spread as that of the polarization of light. As a result, the market offers an overwhelming amount of options. Here we explain how to navigate through this sea of possibilities.
Preprint
Full-text available
High refractive index dielectric spheres present remarkable light-scattering properties in the spectral range dominated by dipolar modes. However, most of these properties are absent for larger spheres under plane wave illumination. Here, we propose to unravel dipolar regimes regardless of the sphere size and refractive index by illuminating with a...
Article
Full-text available
Controlling the helicity and directionality of the scattered light by dielectric particles is paramount to a variety of phenomenology of interest in all-dielectric optics and photonics. In this paper, we demonstrate that the helicity of an incoming beam is not preserved when several multipoles contribute to the scattering. This inhibits the usual l...
Preprint
Full-text available
Recent experiments demonstrated strongly directional coupling of light into waveguide modes. We identify here the mechanisms behind this effect. We consider emitters near a waveguide, either centered on the median plane of the waveguide, or displaced from such plane. We show that, independently of the displacement, the directionality is mostly due...
Preprint
Plasmonic nanopores are the subject of extensive investigations as a potential platform to enable efficient optical read-out in translocation experiments with biomolecules such as DNA and proteins. They allow for the engineering of electromagnetic fields at the nanoscale, which are typically used to enhance the emission efficiency of fluorescent mo...
Article
Full-text available
In this work, we present a plasmonic platform capable of trapping nano-objects in two different spatial configurations. The switch between the two trapping states, localized on the tip and on the outer wall of a vertical gold nanochannel, can be activated by varying the focusing position of the excitation laser along the main axis of the nanotube....
Article
Full-text available
The spontaneous interaction between noble metals and biological scaffolds enables simple and cost-effective synthesis of nanomaterials with unique features. Here, plasmonic silver nanorings are synthesized on a ring-like protein, i.e. a peroxiredoxin (PRX), and used to assemble large arrays of functional nanostructures. The PRX drives the seeding g...
Preprint
Full-text available
Thanks to the spontaneous interaction between noble metals and biological scaffolds, nanomaterials with unique features can be achieved following relatively straightforward and cost-efficient synthetic procedures. Here, plasmonic silver nanorings are synthesized on a ring-like Peroxiredoxin (PRX) protein and used to assemble large arrays of functio...
Article
Full-text available
We fabricated hybrid metal-dielectric nanoantennas and measured their optical response at three different wavelengths. The nanostructure is fabricated on a bilayer film formed by the sequential deposition of silicon and gold on a transparent substrate. The optical characterization is done via fluorescence measurements. We characterized the fluoresc...
Preprint
Full-text available
We fabricated hybrid metal-dielectric nanoantennas and measured their optical response at three different wavelengths. The nanostructure is fabricated on a bilayer film formed by the sequential deposition of silicon and gold on a transparent substrate. The optical characterization is done via fluorescence measurements. We characterized the fluoresc...
Article
Full-text available
In this work, we use a site-selective functionalization strategy to decorate plasmonic nanopores with fluorescent dyes. Using an easy and robust fabrication method, we manage to build plasmonic rings on top of dielectric nanotubes with different inner diameters. The modulation of the dimension of the nanopores allows us to tailor their field confin...
Preprint
Full-text available
In this work we present a plasmonic platform capable of trapping nano-objects as small as 100 nm in two different spatial configurations. The switch between the two trapping states, localized on the tip and on the outer wall of a vertical gold nanochannel, can be activated by a variation in the focusing position of the excitation laser along the ma...
Article
Full-text available
Delivery of molecules into intracellular compartments is one of the fundamental requirements in molecular biology. However, the possibility of delivering a precise number of nano-objects with single-particle resolution is still an open challenge. Here we present an electrophoretic platform based on 3D hollow nanoelectrodes to enable delivery of sin...
Preprint
Full-text available
In this work, we use a site-selective functionalization strategy to decorate plasmonic nanopores with one or more fluorescent dyes. Using an easy and robust fabrication method, we manage to build single plasmonic rings on top of dielectric nanotubes with different inner diameters. The modulation of the dimension of the nanopores allows us to both t...
Article
Full-text available
We fabricate a plasmonic nanoslot that is capable of performing enhanced single molecule detection at 10μM concentrations. The nanoslot combines the tiny detection volume of a zero-mode waveguide and the field enhancement of a plasmonic nanohole. The nanoslot is fabricated on a bi-metallic film formed by the sequential deposition of gold and alumin...
Conference Paper
Full-text available
Single-molecule fluorescence has been successfully applied to many fields in biomedicines, including DNA sequencing, diagnostics, and molecular biology. One of the most used platforms for single molecule sequencing is based on zero-mode waveguides (ZMWs). A ZMW reduces the detection volume by 3 to 6 orders of magnitude, with respect to a standard c...
Article
Full-text available
The emergence of technologies operating at the nanometer scale for applications as varied as nano-fabrication and super-resolution microscopy has driven the need for ever more accurate spatial localization. In this context, nano-structures have been used as probes in order to provide a reference to track lateral drifts in the system. Yet nanometer...
Article
Full-text available
Linear scattering processes are usually described as a function of the parameters of the incident beam. The wavelength, the intensity distribution, the polarization or the phase are among them. Here, we discuss and experimentally demonstrate how the angular momentum and the helicity of light influence the light scattering of spherical particles. We...
Conference Paper
Full-text available
Surface plasmon waves carry an intrinsic transverse spin angular momentum, which is locked to their propagation direction. On the other hand, helical plasmonic distributions may also carry an orbital angular momentum that is linked to the field topology. Apparently, when such a singular plasmonic mode propagates on a surface or is guided on a conic...
Article
Full-text available
In this work we theoretically and experimentally analyze the resonant behavior of individual 3 × 3 gold particle oligomers illuminated under normal and oblique incidence. While this structure hosts both dipolar and quadrupolar electric and magnetic delocalized modes, only dipolar electric and quadrupolar magnetic modes remain at normal incidence. T...
Article
We present an approach to study the interaction between matter and evanescent fields. The approach is based on the decomposition of evanescent plane waves into multipoles of well-defined angular momentum transverse to both decay and propagation directions. We use the approach to identify the origin of the recently observed directional coupling of e...
Article
Chirality of light is of fundamental importance in several enabling technologies with growing applications in life sciences, chemistry and photodetection. Recently, some attention has been focused on chiral quantum emitters. Consequently, optical antennas which are able to tailor the chirality of light emission are needed. Spherical nanoresonators...
Article
Full-text available
We demonstrate that the electromagnetic fields scattered by metallic particles hosting localized surface plasmons can be accurately reproduced by dielectric particles. We derive analytic formulas relating the permittivities of the dielectric and metallic particles that yield identical dipolar electromagnetic responses. This equivalence between diel...
Article
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We demonstrate that the electromagnetic fields scattered by particles made of different materials can be equalized. Emphasize is placed first in metallic nanoparticles that host localized surface plasmons and it is shown that their electromagnetic fields can be identically reproduced with dielectric particles. We derive the explicit formulas relati...
Article
Full-text available
Using a modal approach, we compute the Purcell factor for spherical resonators. The analytic expressions of the normal modes of the resonator are used to calculate the effective volumes. Then we show that the effective volume associated with each normal mode is related to the translation-addition coefficients of a displaced dipole. Finally, we cons...
Article
Full-text available
We motivate metrology schemes based on topological singularities as a way to build robustness against deformations of the system. In particular, we relate reference settings of metrological systems to topological singularities in the measurement outputs. As examples we discuss optical nano-position sensing (i) using a balanced photodetector and a q...
Article
Full-text available
The polarization of the light scattered by an optically dense, random solution of dielectric nanoparticles shows peculiar properties when the scatterers exhibit strong electric and magnetic polarizabilities. While the distribution of the scattering intensity in these systems shows the typical irregular speckle patterns, the helicity of the incident...
Article
Full-text available
We present a study of the properties of the transversal "spin angular momentum" and "orbital angular momen-tum" operators. We show that the "spin angular momentum" operators are generators of spatial translations which depend on helicity and frequency and that the "orbital angular momentum" operators generate trans-formations which are a sequence o...
Article
Full-text available
An analysis of light–matter interactions based on symmetries can provide valuable insight, particularly because it reveals which quantities are conserved and which ones can be transformed within a physical system. In this context, helicity can be a useful addition to more commonly considered observables such as angular momentum. The question arises...
Article
Full-text available
An alternative approach to study light-matter interactions in nano-photonics is presented. This method is based on considering light and sample as a whole system and exploiting their symmetries. The mathematical formalism to systematically study symmetries of light beams is explained and particularly applied to vortex beams. Then, the method is use...
Article
Full-text available
We demonstrate a general method for the first order compensation of singularity splitting in a vortex beam at a single plane. By superimposing multiple forked holograms on the SLM used to generate the vortex beam, we are able to compensate vortex splitting and generate beams with desired phase singularities of order ℓ = 0, 1, 2, and 3 in one plane....
Conference Paper
We will show how to extract information from the Mie coefficients to properly design dual systems combined with chiral elements for having optically active structures. Such optically active elements will scatter the light omnidirectionally, where the amount of rotation of light is fixed in any given direction independently of the incident polarizat...