Nicolas Large

Nicolas Large
University of Texas at San Antonio | UTSA · Department of Physics and Astronomy

Ph.D.

About

70
Publications
15,951
Reads
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3,654
Citations
Introduction
Dr. Large is an Assistant Professor of Physics at UTSA. He obtained a dual PhD in 2011 in Nanophysics from Paul Sabatier University of Toulouse and in Physics of Nanostructures and Advanced Materials from the University of the Basque Country in San Sebastián, Spain where he was supervised by J. Aizpurua and A. Mlayah. Later, he worked as a postdoctoral researcher with P. Nordlander at Rice University in Houston (2012-2014), and with G.C. Schatz at Northwestern University in Chicago (2014-2016).
Additional affiliations
August 2016 - present
University of Texas at San Antonio
Position
  • Professor (Assistant)
June 2014 - July 2016
Northwestern University
Position
  • PostDoc Position
Description
  • Electromagnetic simulation tools for the modeling of the optical response of semiconductor, metallic, and hybrid nanosystems. Electron-based, surface-enhanced, and ultrafast spectroscopies, hot electron generation, and active plasmonics.
February 2012 - May 2014
Rice University
Position
  • PostDoc Position
Description
  • The goal of my research is to tackle challenging problems in the modeling of the optical response of metallic nanostructures, plasmonic and excitonic systems, surface-enhanced Raman scattering, electrical and thermal transport....
Education
September 2007 - October 2011
September 2007 - October 2011
Universidad del País Vasco / Euskal Herriko Unibertsitatea
Field of study
  • Physics of Nanostructures and Advanced Materials
September 2005 - July 2007
Paul Sabatier University - Toulouse III
Field of study
  • Matter Physics

Publications

Publications (70)
Article
Full-text available
The internal structure of hollow AgAu nanorods created by partial galvanic replacement was manipulated reversibly and its effect on optical properties was mapped with nanometer resolution. Using the electron beam in a scanning transmission electron microscope to create solvated electrons in an encapsulated solution-filled cavity in the nanorods, Ag...
Article
Electron energy-loss spectroscopy (EELS) is a unique tool which is extensively used to investigate the plasmonic response of metallic nanostructures. We present here a novel approach for EELS calculations using the Finite-Difference Time-Domain (FDTD) method (EELS-FDTD). We benchmark our approach by direct comparison with results from the well-esta...
Article
In a standing wave optical cavity, the coupling of cavity modes, for example, through a nonlinear medium, results in a rich variety of nonlinear dynamical phenomena, such as frequency pushing and pulling, mode-locking and pulsing, modal instabilities, even complex chaotic behavior. Metallic nanowires of finite length support a hierarchy of longitud...
Article
Full-text available
Strong coupling between resonantly-matched localized surface plasmons and molecular excitons results in the formation of new hybridized energy states called plexcitons. Understanding the nature and tunability of these hybrid nanostructures is important for both fundamental studies and the development of new applications. We investigate the interact...
Article
Full-text available
We propose and explore theoretically a new concept of ultrafast optical switches based on nonlinear plasmonic nanoantennas. The antenna nanoswitch operates on the transition from the capacitive to conductive coupling regimes between two closely spaced metal nanorods. By filling the antenna gap with amorphous silicon, progressive antenna-gap loading...
Article
Introduction The advanced features of plasmonic nanomaterials enable initial high accuracy detection with different therapeutic intervention. Computational simulations could estimate the plasmonic heat generation with a high accuracy and could be reliably compared to experimental results. This proposed combined theoretical-experimental strategy may...
Article
Full-text available
Computational modelling of plasmonic periodic structures are challenging due to their multiscale nature. On one hand, nanoscale building blocks require very fine spatial discretization of the computation domain to describe...
Preprint
Full-text available
Interactions between elementary excitations such as plasmon-exciton and plasmon-phonon are of great interest from a fundamental point of view and for novel applications. While plasmon-exciton have been extensively studied both experimentally and theoretically, the interaction mechanisms between acoustic vibrations (phonons) and localized surface pl...
Article
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In this work, we conduct a comprehensive computational study of the optical and photothermal properties of multifunctional α-Fe2O3/Au/SiO2 nanorice matryoshka nanoparticles using a combination of boundary element method, finite element method, and discontinuous Galerkin time-domain method. The magnetic core in the nanorice allows their use as a con...
Article
Full-text available
The extension of plasmonics to materials beyond the conventional noble metals opens up a novel and exciting regime after the inspiring discovery of characteristic localized surface plasmon resonances (LSPRs) in doped semiconductor nanocrystals originating from the collective oscillations of free holes in the valence band. We herein prepare colloida...
Article
Bimetallic nanostructures exhibit unique catalytic activity and selectivity that are not evident for their monometallic analogues. Such nanostructures contain plasmonic metals, such as gold or silver, which afford highly efficient harvesting of electromagnetic radiation and its conversion into hot carriers. These highly energetic species are transf...
Article
Full-text available
In the developing field of nonlinear plasmonics, it is important to understand the fundamental relationship between properties of the localized surface plasmon resonance (LSPR) of metallic nanostructures and their nonlinear optical responses. A detailed understanding of nonlinear responses from nanostructures with well characterized LSPRs is an ess...
Preprint
Full-text available
In the developing field of nonlinear plasmonics, it is important to understand the fundamental relationship between properties of the localized surface plasmon resonance (LSPR) of metallic nanostructures and their nonlinear optical responses. A detailed understanding of nonlinear responses from nanostructures with well characterized LSPRs is an ess...
Article
Induced hyperthermia has been demonstrated as an effective oncological treatment due to the reduced heat tolerance of most malignant tissues; however, most techniques for heat generation within a target volume are insufficiently selective, inducing heating and unintended damage to surrounding healthy tissues. Plasmonic photothermal therapy (PPTT) u...
Conference Paper
Full-text available
Article
Nanoscale localization of electromagnetic fields using metallic nanostructures can catalyze chemical reactions in their immediate vicinity. Local optical field confinement and enhancement is also exploited to attain single molecule detection sensitivity in surface and tip-enhanced Raman (TER) spectroscopy. In this work, we observe and investigate t...
Article
Growth of anisotropic nanostructures enables the manipulation of the optical properties across the electromagnetic spectrum by the fine morphological tuning of the nanoparticles. Among them, stellated metallic nanostructures present enhanced properties owing to their complex shape, and hence, the control over the final morphology becomes of great i...
Article
Description of the relationship between protein structure and function remains a primary focus in molecular biology, biochemistry, protein engineering and bioelectronics. Moreover, the investigation of the protein conformational changes after adhesion and dehydration is of importance to tackle problems related to the interaction of proteins with so...
Article
Full-text available
We report on the surface enhanced resonant Raman scattering (SERRS) in hybrid MoSe2@Au plasmonic-excitonic nanostructures, focusing on the situation where the localized surface plasmon resonance of Au nanodisks is finely tuned to the exciton absorption of monolayer MoSe2. Using a resonant excitation, we investigate the SERRS in MoSe2@Au and the res...
Article
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Lithographic and non-lithographic two-dimensional (2D) substrates for surface-enhanced Raman spectroscopy (SERS) have gained enormous popularity as analytical platforms for detection and identification of various analytes. However, their near- and far-field properties in most cases remain poorly understood. We have previously developed a metal nano...
Article
Recently, concave nanocube (CNC) shaped metal nanoparticles (MNPs) with high index facets have drawn special attention due to their high chemical activity and large electromagnetic (EM) field enhancements, making them good candidates for multifunctional platforms. However, most of the previously published works focused on the plasmonic properties o...
Article
We present a high-resolution distance dependence study of surface-enhanced Raman scattering (SERS) enabled by atomic layer deposition (ALD) at 55 and 100 °C. ALD is used to deposit monolayers of Al2O3 on bare silver film-over-nanospheres (AgFONs) and AgFONs functionalized with self-assembled monolayers. Operando SERS is used to measure the intensit...
Article
Full-text available
Recently, Ag-Ag2S hybrid nanostructures have attracted a great deal of attention due to their enhanced chemical and thermal stability, in addition to their morphology- and composition-dependent tunable local surface plasmon resonances. Although Ag-Ag2S nanostructures can be synthesized via sulfidation of as-prepared anisotropic Ag nanoparticles, th...
Article
Simplicity and low cost has positioned inkjet paper- and fabric-based 3D substrates as two of the most commonly used surface-enhanced Raman spectroscopy (SERS) platforms for the detection and the identification of chemical and biological analytes down to the nanogram and femtogram levels. The relationship between far-field and near-field properties...
Article
Shape-controlled synthesis of gold nanoparticles generally involves the use of surfactants, typically cetyltrimethylammonium (CTAX, X = Cl(-) , Br(-) ), to regulate the nucleation growth process and to obtain colloidally stable nanoparticles. The surfactants adsorb on the nanoparticle surface making further functionalization difficult and therefore...
Article
Fabrication of high-density plasmonic dimers on a large (wafer) scale is crucial for applications in surface-enhanced spectroscopy, bio- and molecular sensing, and optoelectronics. Here, we present an experimental approach based on nanoimprint lithography and shadow evaporation that allows for the fabrication of high-density, large-scale homo- (Au–...
Article
We demonstrate that Au nanoparticles with tipped surface structures, such as concave nanocubes, nanotrisoctahedra, and nanostars, possess size-dependent tunable plasmon resonances and intense near-field enhancements exploitable for single-particle surface-enhanced Raman spectroscopy (spSERS) under near-infrared excitation. We report a robust seed-m...
Article
We demonstrate that Ag-Cu2O core-shell nanoparticles exhibit geometry-dependent optical properties that are highly tunable across the visible and near-infrared spectral regions. We have developed a robust wet chemistry approach to the geometry control of Ag-Cu2O core-shell nanoparticles through epitaxial growth of Cu2O nanoshells on the surfaces of...
Article
Noble metal nanoparticles have been of tremendous interest due to their intriguing size- and shape-dependent plasmonic and catalytic properties. Combining tunable plasmon resonances with superior catalytic activities on the same metallic nanoparticle, however, has long been challenging because nano-plasmonics and nano-catalysis typically require na...
Article
Porous Au nanoparticles with fine-controlled overall particle sizes have been fabricated using a kinetically controlled seed-mediated growth method. In contrast to spherical Au nanoparticles with smooth surfaces, the porous Au nanoparticles exhibit far greater size-dependent plasmonic tunability and significantly intensified local electric field en...
Article
Hot electron-induced photodissociation of H2 was demonstrated on small Au nanoparticles supported on SiO2. The rate of dissociation of H2 was found to be almost two orders of magnitude higher than that observed on equiv-alently prepared Au nanoparticles on TiO2. The rate of H2 dissociation was found to be linearly dependent on illumina-tion intensi...
Article
The light scattering properties of hemispherical resonant nanoantennas can be used to redirect normal incidence light to propagate within a thin film or thin film-based device, such as a solar cell, for enhanced efficiency. While planar nanoantennas are typically fabricated as simple nanoparticles or nanostructures in the film plane, here we show t...
Article
Full-text available
Assembling nanoparticles into well-defined structures is an important way to create and tailor the optical properties of materials. Most advances in metamaterials research to date have been based on structures fabricated in two-dimensional planar geometries. Here, we show an efficient method for assembling noble metal nanoparticles into stable, thr...
Article
Full-text available
We performed Cathodoluminescence (CL) spectroscopy and imaging in a high resolution scanning electron microscope to locally and selectively excite and investigate the plasmonic property of a multibranched gold nanostar on silicon substrate. This method allows us to map the local density of optical states from the nanostar with a spatial resolution...
Article
Heterogeneous catalysis is of paramount importance in chemistry and energy applications. Catalysts that couple light energy into chemical reactions in a directed, orbital-specific manner would greatly reduce the energy input requirements of chemical transformations, revolutionizing catalysis-driven chemistry. Here we report the room temperature dis...
Conference Paper
Full-text available
Metal nano-objects and nano-structures have recently attracted much interest due to their possible use in new nanoscale optical devices (nano-antennas, negative refraction lenses, surface wave guides) [1], for biomedical application and for the control of the light emission, absorption and scattering (Raman-Brillouin and Rayleigh scattering) in sur...
Article
Full-text available
Using numerical simulations, we demonstrate that fine shape details of gold nanoring-disks are responsible for significant modifications of their localized surface plasmon properties. The numerical results are supported by optical transmission measurements and by atomic force microscopy. In particular, we found that, depending on the ring wall shar...
Article
Full-text available
In this work we report on the observation of surface plasmon properties of periodic arrays of gold nanoring trimers fabricated by electron beam lithography. It is shown that the localized surface plasmon resonances of such gold ring trimers occur in the infrared spectral region and are strongly influenced by the nanoring geometry and their relative...
Article
Full-text available
The concept of ultrafast optical switches based on the nonlinear response of loaded plasmonic nanoantennas is proposed and explored. The plasmonic nanoswitch shows a transition from a capacitive to a conductive coupling regimes in the gap between two closely spaced metal nanorods. A photoconductive semiconductor in the gap is used to generate a fre...
Conference Paper
Full-text available
We study theoretically and experimentally the coupling of acoustic vibrations (phonons) and surface plasmons in metallic nano-objects. The modulation of the surface charge density allows for the interpretation of experimental Raman-Brillouin spectra in silver nanorods.
Conference Paper
Full-text available
This work shows the production of self-assembled elongated nano-objects embedded in an oxide host oriented perpendicular to the substrate and their acousto-plasmonic dynamics. Electromagnetic #x201C;hot spots #x201D; are created that activate anomalous Raman vibrational modes.
Article
We investigate the acousto-plasmonic dynamics of metallic nano-objects by means of resonant Raman scattering and time-resolved femtosecond transient absorption. We observe an unexpectedly strong acoustic vibration band in the Raman scattering of silver nanocolumns, usually not found in isolated nano-objects. The frequency and the polarization of th...
Conference Paper
A powerful capability of metallic nano-objects is to serve as enhancers of the Raman signal in a large variety of spectroscopies (SERS, SEIRA). We focus in this work on the role of plasmons on the excitation of acoustic vibrations of metallic nano-objects. The coupling between acoustic vibrations and surface plasmons still presents several theoreti...
Conference Paper
One of the most powerful capabilities of metallic nanoparticles is to serve as enhancers of the signal in a large variety of spectroscopies (SERS, SEIRA). We focus in this contribution on the role of plasmons in the excitation of acoustic vibrations of metallic nano-objects. The coupling between acoustic vibrations and surface plasmons still presen...