Vetenskapliga publikationer
Nedan finner ni ett sjuttiotal vetenskapliga publikationer där våra instrument och teknologi använts för att generera ny kunskap. Om ni föredrar att sortera dem på forskningsområde så finns de även listade under Applikationer.
Metal–polymer hybrid nanomaterials for plasmonic ultrafast hydrogen detection
01 Apr 2019
Hydrogen–air mixtures are highly flammable. Hydrogen sensors are therefore of paramount importance for timely leak detection during handling. However, existing solutions do not meet the stringent performance targets set by…
A Molecular Sponge: pH-driven Reversible Squeezing of Stimuli-Sensitive Peptide Monolayers
13 Mar 2019
The cyclic change of structure, thickness and density, with pH switching from acid (pH=3) to basic (pH=11) condition, has been revealed for chemisorbed monolayers of the peptide Lipo-Aib-Lys-Leu-Aib-Lys-Lys-Leu-Aib-Lys-Ile-Lol, a Trichogin…
Calcium Dependent Reversible Aggregation of Escherichia coli Biomimicking Vesicles Enables Formation of Supported Vesicle Layers on Silicon Dioxide
01 Mar 2019
The importance of using biomimicking membranes for various biological applications is rising, as such models are relevant for imitating real organisms. In addition, biomimicking membranes are usually much more repeatable…
Heterodimers for in Situ Plasmonic Spectroscopy: Cu Nanoparticle Oxidation Kinetics, Kirkendall Effect, and Compensation in the Arrhenius Parameters
18 Feb 2019
The ability to study oxidation, reduction, and other chemical transformations of nanoparticles in real time and under realistic conditions is a non-trivial task due to their small dimensions and the…
Silicic acid mediated formation of tannic acid nanocoatings
11 Feb 2019
Tannic acid (TA) adheres to a broad variety of different materials and forms versatile surface coatings for technical and biological applications. In mild alkaline conditions, auto-oxidation processes occur and a…
Nanoplasmonic Sensor Detects Preferential Binding of IRSp53 to Negative Membrane Curvature
04 Feb 2019
Biosensors based on plasmonic nanostructures are widely used in various applications and benefit from numerous operational advantages. One type of application where nanostructured sensors provide unique value in comparison with,…
Nanoplasmonic sensing of CH3NH3PbI3 perovskite formation in mimic of solar cell photoelectrodes
05 Nov 2018
Hybrid metal-halide perovskites have emerged as leading class of semiconductors for photovoltaic devices with remarkable light harvesting efficiencies. The formation of methylammonium lead iodide (CH3NH3PbI3) perovskite into mesoporous titania (TiO2)…
Assessment of Ruthenium Dye N719 Adsorption Kinetics in Mesoporous TiO2 Films of Dye-Sensitized Solar Cells via Nanoplasmonic Sensing
18 Okt 2018
A dye monolayer formation on a semiconductor surface is critical for efficient dye-sensitized solar cells. The role of dye is to absorb light and convert it to photoelectrons, which are…
Determination of the Main Phase Transition Temperature of Phospholipids by Nanoplasmonic Sensing
04 Okt 2018
Our study demonstrates that nanoplasmonic sensing (NPS) can be utilized for the determination of the phase transition temperature (Tm) of phospholipids. During the phase transition, the lipid bilayer undergoes a…
Nanoplasmonic Ruler for Measuring Separation Distance between Supported Lipid Bilayers and Oxide Surfaces
01 Okt 2018
Unraveling the details of how supported lipid bilayers (SLBs) are coupled to oxide surfaces is experimentally challenging, and there is an outstanding need to develop highly surface-sensitive measurement strategies to…
Temperature-Induced Denaturation of BSA Protein Molecules for Improved Surface Passivation Coatings
04 Sep 2018
Bovine serum albumin (BSA) is the most widely used protein for surface passivation applications, although it has relatively weak, non-sticky interactions with hydrophilic surfaces such as silica-based materials. Herein, we…
Impact of nanoparticles on amyloid peptide and protein aggregation: a review with a focus on gold nanoparticles
03 Sep 2018
Society is increasingly exposed to nanoparticles as they are ubiquitous in nature and introduced as man-made air pollutants and as functional ingredients in cosmetic products as well as in nanomedicine.
Peripheral Membrane Proteins Facilitate Nanoparticle Binding at Lipid Bilayer Interfaces
13 Aug 2018
Molecular understanding of the impact of nanomaterials on cell membranes is critical for the prediction of effects that span environmental exposures to nanoenabled therapies. Experimental and computational studies employing phospholipid…
Nanoplasmonic Sensing Architectures for Decoding Membrane Curvature-Dependent Biomacromolecular Interactions
28 Maj 2018
Nanoplasmonic sensors have emerged as a promising measurement approach to track biomacromolecular interactions involving lipid membrane interfaces. By taking advantage of nanoscale fabrication capabilities, it is possible to design sensing…
Nanoplasmonic sensing and capillary electrophoresis for fast screening of interactions between phosphatidylcholine biomembranes and surfactants
01 Maj 2018
Nanoplasmonic sensing (NPS), based on localized surface plasmon resonance, with sensors composed of glass covered with golden nanodisks and overlaid with a SiO2 coating was applied in this study. Egg…
Quantitative Comparison of Protein Adsorption and Conformational Changes on Dielectric-Coated Nanoplasmonic Sensing Arrays
22 Apr 2018
Nanoplasmonic sensors are a popular, surface-sensitive measurement tool to investigate biomacromolecular interactions at solid-liquid interfaces, opening the door to a wide range of applications. In addition to high surface sensitivity,…
Counting charges on membrane-bound peptides
03 Apr 2018
Quantifying the number of charges on peptides bound to interfaces requires reliable estimates of (i) surface coverage and (ii) surface charge, both of which are notoriously difficult parameters to obtain,…
Thermal properties and segmental dynamics of polymer melt chains adsorbed on solid surfaces
12 Mar 2018
The glass transition of supported polystyrene (PS) and poly(2-vinylpyridine) (P2VP) thin films in the vicinity of the substrate interface was studied by using a nanoplasmonic sensing (NPS) method. This “nanocalorimetric”…
Thermal cis-to-trans Isomerization of Azobenzene Side Groups in Metal-Organic Frameworks investigated by Localized Surface Plasmon Resonance Spectroscopy
05 Jan 2018
The energy barrier for cis-to-trans isomerization is among the key parameters for photoswitchable molecules such as azobenzene. Recently, we introduced a well-defined model system based on thin films…
Preferential oxidation of CO in H2 on Cu and Cu/CeOx catalysts studied by in situ UV–Vis and mass spectrometry and DFT
14 Dec 2017
Preferential oxidation of CO in H2 was studied by in situ ultraviolet–visible (UV–Vis) and mass spectrometry on flat model Cu and Cu/CeOx catalysts. The experimental findings were interpreted and compared with…
Multi-Component Uptake of Dye Molecules by Films of Nanoporous Metal–Organic Frameworks
15 Nov 2017
Nanoporous materials, such as metal–organic frameworks (MOFs), enable the separation of various molecular mixtures. Thus, detailed knowledge of multi-component diffusion properties of the guest molecules in the pores is vital.
Indirect Nanoplasmonic Sensing Platform for Monitoring Temperature-Dependent Protein Adsorption
07 Nov 2017
The development of highly surface-sensitive measurement approaches to monitor protein adsorption across different temperatures would advance understanding of how thermally activated processes contribute to the denaturation of adsorbed proteins. Herein,…
Cholesterol affects the interaction between an ionic liquid and phospholipid vesicles. A study by differential scanning calorimetry and nanoplasmonic sensing
10 Sep 2017
The present work aims at studying the interactions between cholesterol-rich phosphatidylcholine-based lipid vesicles and trioctylmethylphosphonium acetate ([P8881][OAc]), a biomass dissolving ionic liquid (IL). The effect of cholesterol was assayed…
Gold nano disks arrays for localized surface plasmon resonance based detection of PSA cancer marker
31 Aug 2017
Highlights We propose a new approach of PSA detection based on LSPR extinction spectrum of gold nanodisk arrays functionalized with specific aptamers. We…
Gold nanoparticle-based localized surface plasmon immunosensor for staphylococcal enterotoxin A (SEA) detection
16 Aug 2017
We describe the engineering of stable gold nanoparticle (AuNP) bioconjugates for the detection of staphylococcal enterotoxin A (SEA) using localized surface plasmon resonance (LSPR). Two types of AuNP bioconjugates were…
Probing the Interaction of Dielectric Nanoparticles with Supported Lipid Membrane Coatings on Nanoplasmonic Arrays
23 Jun 2017
The integration of supported lipid membranes with surface-based nanoplasmonic arrays provides a powerful sensing approach to investigate biointerfacial phenomena at membrane interfaces. While a growing number of lipid vesicles, protein,…
Fabrication and Characterization of Plasmonic Nanopores with Cavities in the Solid Support
20 Jun 2017
Plasmonic nanostructures are widely used for various sensing applications by monitoring changes in refractive index through optical spectroscopy or as substrates for surface enhanced Raman spectroscopy. However, in most practical…
Nanoplasmonic Sensing at the Carbon-Bio Interface: Study of Protein Adsorption at Graphitic and Hydrogenated Carbon Surfaces
11 Apr 2017
Various forms of carbon are known to perform well as biomaterials in a variety of applications and an improved understanding of their interactions with biomolecules, cells, and tissues is…
Nanoplasmonic sensors for biointerfacial science
06 Apr 2017
In recent years, nanoplasmonic sensors have become widely used for the label-free detection of biomolecules across medical, biotechnology, and environmental science applications. To date, many nanoplasmonic sensing strategies have been…
Probing Spatial Proximity of Supported Lipid Bilayers to Silica Surfaces by Localized Surface Plasmon Resonance Sensing
15 Mar 2017
On account of high surface sensitivity, localized surface plasmon resonance (LSPR) sensors have proven widely useful for studying lipid membrane configurations at solid–liquid interfaces. Key measurement capabilities include distinguishing…
Real-time in situ analysis of biocorona formation and evolution on silica nanoparticles in defined and complex biological environments
23 Feb 2017
Biomolecules such as proteins immediately adsorb on the surface of nanoparticles upon their exposure to a biological environment. The formed adlayer is commonly referred to as biomolecule corona (biocorona) and…
A fullerene alloy based photovoltaic blend with a glass transition temperature above 200 °C
06 Feb 2017
Organic solar cells with a high degree of thermal stability require bulk-heterojunction blends that feature a high glass transition, which must occur considerably above the temperatures encountered during device fabrication…
Generation of anti-inflammatory macrophages for implants and regenerative medicine using self-standing release systems with a phenotype-fixing cytokine cocktail formulation
01 Feb 2017
The immediate tissue microenvironment of implanted biomedical devices and engineered tissues is highly influential on their long term fate and efficacy. The creation of a long-term anti-inflammatory microenvironment around implants…
Plasmonic Nanospectroscopy for Thermal Analysis of Organic Semiconductor Thin Films
23 Jan 2017
Organic semiconductors are key materials for the next generation of thin film electronic devices like field-effect transistors, light-emitting diodes and solar cells. Accurate thermal analysis is essential for the fundamental…
Unraveling interactions between ionic liquids and phospholipid vesicles using nanoplasmonic sensing
09 Jan 2017
Owing to their unique properties and unlimited structural combinations, the ubiquitous use of ionic liquids (ILs) is steadily increasing. The objective of the present work is to shed light into…
Quantitative Profiling of Nanoscale Liposome Deformation by a Localized Surface Plasmon Resonance Sensor
16 Dec 2016
Characterizing the shape of sub-100 nm, biological soft-matter particulates (e.g., liposomes and exosomes) adsorbed at a solid-liquid interface remains a challenging task. Here, we introduce a localized surface plasmon resonance…
Investigating How Vesicle Size Influences Vesicle Adsorption on Titanium Oxide: A Competition between Steric Packing and Shape Deformation
08 Dec 2016
Understanding the adsorption behavior of lipid vesicles at solid-liquid interfaces is important for obtaining fundamental insights into soft matter adsorbates as well as for practical applications such as supported lipid…
Integration of Quartz Crystal Microbalance-Dissipation and Reflection-Mode Localized Surface Plasmon Resonance Sensors for Biomacromolecular Interaction Analysis
25 Nov 2016
The combination of label-free, surface-sensitive measurement techniques based on different physical principles enables detailed characterization of biomacromolecular interactions at solid-liquid interfaces. To date, most combined measurement systems have involved experimental…
Peptide Functionalized Gold Nanoparticles with Optimized Particle Size and Concentration for Colorimetric Assay Development: Detection of Cardiac Troponin I
10 Nov 2016
Peptide-functionalized gold nanoparticles (AuNPs) are extensively utilized in colorimetric assays for rapid and sensitive detection of various biomedical and environmental targets. Although extensively used as colorimetric reporting systems, the…
Role of ZnO and CeOx in Cu-Based Model Catalysts in Activation of H2O and CO2 Dynamics Studied by in Situ Ultraviolet–Visible and X-ray Photoelectron Spectroscopy
17 Okt 2016
Flat model and powder Cu, ZnO/Cu, and CeOx/Cu catalysts were studied by focusing on the role of the oxide phase as a promoter in the water gas shift (WGS)…
Kinetic discrimination of DNA single-base mutations by localized surface plasmon resonance
14 Okt 2016
Clinical application of DNA microarrays used for screening of single nucleotide polymorphisms (SNPs) are very important for diagnosis of diseases and appropriate treatment of patients. In this paper localized surface…
Influence of Divalent Cations on Deformation and Rupture of Adsorbed Lipid Vesicles
16 Maj 2016
The fate of adsorbed lipid vesicles on solid supports depends on numerous experimental parameters and typically results in the formation of a supported lipid bilayer (SLB) or an adsorbed vesicle…
Core–Shell Nanoplasmonic Sensing for Characterization of Biocorona Formation and Nanoparticle Surface Interactions
16 Maj 2016
Surface properties of nanoparticles imposed by particle size, shape, and surface chemistry are key features that largely determine their environmental fate and effects on biological systems. Consequently, development of…
Plasmonic Nanospectroscopy of Platinum Catalyst Nanoparticle Sintering in a Mesoporous Alumina Support
09 Maj 2016
In situ plasmonic nanospectroscopy has proven useful to bridge the pressure gap in heterogeneous catalysis. The method has, however, so far been used only for idealized two-dimensional systems without the…
Cu Model Catalyst Dynamics and CO Oxidation Kinetics Studied by Simultaneous in Situ UV–Vis and Mass Spectroscopy
14 Mar 2016
The oxidation state of Cu nanoparticles during CO oxidation…
Graphene Oxide and Lipid Membranes: Size-Dependent Interactions
07 Mar 2016
We have investigated the interaction of graphene oxide (GO) sheets with supported lipid membranes with focus on how the interaction depends on GO sheet size (three samples in the range…
Surface-Anchored Metal-Organic Frameworks – SURMOFs: A New Material Platform for Sensors
09 Dec 2015
The application of surface-anchored metal-organic frameworks (SURMOFs) as highly porous host materials for molecules in the field of nanoplasmonic sensing (NPS) is reported. SURMOFs are grown by a layer-bylayer procedure…
Plasmonic Nanohole Sensor for Capturing Single Virus-Like Particles toward Virucidal Drug Evaluation.
09 Okt 2015
A plasmonic nanohole sensor for virus-like particle capture and virucidal drug evaluation is reported. Using a materials-selective surface functionalization scheme, passive immobilization of virus-like particles only within the nanoholes is…
Nanoplasmonic ruler to measure lipid vesicle deformation
01 Okt 2015
A nanoplasmonic ruler method is presented in order to measure the deformation of adsorbed, nm-scale lipid vesicles on solid supports. It is…
UV-vis and Plasmonic Nano-Spectroscopy of the CO2 Adsorption Energetics in Microporous Polymers
28 Sep 2015
In the context of Carbon Capture and Storage (CCS), micro- and mesoporous polymers have received significant attention due…
Reduction of Cu-Promoted Fe Model Catalysts Studied by In Situ Indirect Nanoplasmonic Sensing and X-ray Photoelectron Spectroscopy
23 Jan 2015
The reduction of Cu-promoted Fe model catalysts was investigated…
Contribution of Temperature to Deformation of Adsorbed Vesicles Studied by Nanoplasmonic Biosensing
20 Jan 2015
With increasing temperature, biological macromolecules and nanometer-sized aggregates typically…
Unravelling the Dependence of Hydrogen Oxidation Kinetics on the Size of Pt Nanoparticles by in Operando Nanoplasmonic Temperature Sensing
05 Dec 2014
We use a noninvasive nanoscale optical-temperature measurement method based on localized surface plasmon resonance to investigate the particle size-dependence of the hydrogen oxidation reaction kinetics on model supported Pt nanocatalysts…
In situ Plasmonic Sensing of Platinum Model Catalyst Sintering on Different Oxide Supports and in O2 and NO2 Atmospheres with Different Concentrations
01 Dec 2014
Improved understanding of thermal deactivation processes of supported nanoparticles via sintering is needed in order to increase the lifetime of catalysts. To monitor sintering processes under industrially relevant application conditions,…
Controlling Lipid Membrane Architecture for Tunable Nanoplasmonic Biosensing
30 Jul 2014
Tunable nanoplasmonic biosensing for lipid and protein applications is reported based on controlling lipid membrane architecture on surfaces. The interaction of a peptide with lipid membranes is highly sensitive to…
Nanoplasmonic Biosensing for Soft Matter Adsorption: Kinetics of Lipid Vesicle Attachment and Shape Deformation
04 Jul 2014
An indirect nanoplasmonic sensing platform is reported for investigating the kinetics of attachment and shape deformation associated with lipid vesicle adsorption onto a titanium oxide-coated substrate. The localized surface plasmon…
Thermodynamics of hydride formation and decomposition in supported sub-10 nm Pd nanoparticles of different sizes
30 Maj 2014
Hydrogen storage properties of supported Pd nanoparticles with average sizes in the range 2.7–7.6 nm were studied using indirect nanoplasmonic sensing. For each particle size, a series of isotherms was…
Real Time Adsorption and Desorption Kinetics of Dye Z907 on a Flat Mimic of Dye-Sensitized Solar Cell TiO2 Photoelectrodes
12 Maj 2014
A dye molecule monolayer formed on a TiO2 surface is a key component in Dye Sensitized Solar Cells. It is usually formed by adsorbing dye molecules from a solution. The…
Diffusion and Adsorption of Dye Molecules in Mesoporous TiO2 Photoelectrodes Studied by Indirect Nanoplasmonic Sensing
19 Aug 2013
In this study, we used Hidden Interface-Indirect Nanoplasmonic Sensing (HI-INPS) for real time monitoring of dye impregnation (adsorption–diffusion process) of mesoporous TiO2 electrodes of the kind used in dye-sensitized solar…
Nanoplasmonic Sensing for Monitoring the Initial Stages of Atmospheric Corrosion of Cu Nanodisks and Thin Films
16 Aug 2013
Nanoplasmonic sensing as a powerful experimental technique for corrosion kinetics monitoring is demonstrated. Its versatility is illustrated by studies of initial corrosion carried out on model systems consisting of copper…
Localized Surface Plasmon Resonance Investigations of Photoswitching in Azobenzene-Functionalized Self-Assembled Monolayers on Au
02 Aug 2013
Localized plasmon resonance (LSPR) spectroscopy, employing gold nanodisk substrates, is applied for studies of photoswitching in self-assembled monolayers of azobenzene-containing thiols. By choosing customized samples in which the sharp LSPR…
Combined in Situ Quartz Crystal Microbalance with Dissipation Monitoring, Indirect Nanoplasmonic Sensing, and Vibrational Sum Frequency Spectroscopic Monitoring of Alkanethiol-Protected Copper Corrosion
28 Maj 2013
In this study, we have applied three techniques to…
Nanoplasmonic Sensing for Nanomaterials Science
06 Dec 2012
Nanoplasmonic sensing has over the last two decades emerged as and diversified into a very promising experimental platform technology for studies of biomolecular interactions and for biomolecule detection (biosensors). Inspired…
Nanoplasmonic in situ Spectroscopy for Catalysis Applications
17 Aug 2012
Nanoplasmonic sensing in general and indirect nanoplasmonic sensing (INPS) in particular constitute a versatile and promising experimental strategy for real time in situ spectroscopy of catalyst materials at the ensemble…
Time-Resolved Indirect Nanoplasmonic Sensing Spectroscopy of Dye Molecule Interactions with Dense and Mesoporous TiO2 Films
09 Apr 2012
Indirect nanoplasmonic sensing (INPS) is an experimental platform exploiting localized surface plasmon resonance (LSPR) detection of processes in nanomaterials, molecular assemblies, and films at the nanoscale. Here we have for…
Real Time Indirect Nanoplasmonic in situ Spectroscopy of Catalyst Nanoparticle Sintering
03 Jan 2012
Catalyst deactivation by sintering significantly reduces productivity and energy efficiency of the chemical industry, and the effectiveness of environmental cleanup processes. It also hampers the introduction of novel energy conversion…
Hydride Formation in Single Palladium and Magnesium Nanoparticles Studied By Nanoplasmonic Dark-Field Scattering Spectroscopy
05 Sep 2011
Scrutinizing functional nanosystems and relating details in their size, chemistry, and geometry to functionality remains a significant experimental challenge. Following the concept of indirect nanoplasmonic sensing (INPS), the exploitation of…
Gold, Platinum, and Aluminum Nanodisk Plasmons: Material Independence, Subradiance, and Damping Mechanisms
25 Mar 2011
Localized surface plasmon resonances (LSPR) are collective electronic excitations in metallic nanoparticles. The LSPR spectral peak position, as a function of nanoparticle size and material, is known to depend primarily…
Nanoplasmonic sensing and QCM-D as ultrasensitive complementary techniques for kinetic corrosion studies of aluminum nanoparticles
15 Jan 2011
Corrosion (oxidation) kinetics of Al nanodisks, 262 nm in diameter and 20 nm in height, was measured in degassed Milli-Q water at 23 °C and neutral pH by quartz crystal…
Localized Surface Plasmons Shed Light on Nanoscale Metal Hydrides
23 Aug 2010
Nanometer-sized hydrides are attractive for hydrogen storage. Nanofabricated model systems can be studied by a novel localized surface plasmon resonance (LSPR) based direct sensing approach and by quartz crystal microbalance.
Indirect Nanoplasmonic Sensing: Ultrasensitive Experimental Platform for Nanomaterials Science and Optical Nanocalorimetry
18 Aug 2010
Indirect nanoplasmonic sensing is a novel experimental platform for measurements of thermodynamics and kinetics in/on nanomaterials and thin films. It features simple experimental setup, high sensitivity, small sample amounts, high…
Size-Dependent Kinetics of Hydriding and Dehydriding of Pd Nanoparticles
31 Mar 2010
Using a new indirect nanoplasmonic sensing method with subsecond resolution, we have studied hydriding and dehydriding kinetics of Pd nanoparticles in the size range 1.8–5.4 nm. Strong particle-size effects are…
Size-dependent hysteresis in the formation and decomposition of hydride in metal nanoparticles
04 Feb 2010
Using a novel indirect nanoplasmonic sensing platform, we have measured hydrogen absorption/desorption isotherms in Pd nanoparticles with an average diameter from 1.8 to 8 nm at 30 °C. The isotherms…
A combined nanoplasmonic and electrodeless quartz crystal microbalance setup
07 Dec 2009
We have developed an instrument combining localized surface plasmon resonance (LSPR) sensing with electrodeless quartz crystal microbalance with dissipation monitoring (QCM-D). The two techniques can be run simultaneously, on the…
Nanoplasmonic Probes of Catalytic Reactions
22 Okt 2009
Optical probes of heterogeneous catalytic reactions can be valuable tools for optimization and process control because they can operate under realistic conditions, but often probes lack sensitivity. We have developed…
Hole-Mask Colloidal Lithography
29 Nov 2007
Hole-mask colloidal lithography (HCL) represents a truly versatile and simple bottom-up nanofabrication method based on colloidal self-assembly lithographic patterning. The HCL technique provides an effective means of patterning vast surface…
Hydrogen Storage in Pd Nanodisks Characterized with a Novel Nanoplasmonic Sensing Scheme
13 Sep 2007
A novel nanoplasmonic sensing scheme is introduced based on remote real-time detection of induced electronic and shape/structural changes in a metal nanoparticle during the metal−hydride formation process. The localized surface…
Absorption and scattering of light by Pt, Pd, Ag, and Au nanodisks: Absolute cross sections and branching ratios
15 Maj 2007
Localized surface plasmons (LSPs) of metallic nanoparticles decay either radiatively or via an electron-hole pair cascade. In this work, the authors have experimentally and theoretically explored the branching ratio of…
Sensing Characteristics of NIR Localized Surface Plasmon Resonances in Gold Nanorings for Application as Ultrasensitive Biosensors
13 Apr 2007
The optical responses of 75−150 nm diameter gold nanorings to changes in local refractive index have been quantified by near-infrared extinction spectroscopy and compared to DDA calculations and an analytical…